Artykuły w czasopismach: „Mg AZ31B”

1

Numano, Masatada, Nobuyuki Mori, Yoshihiro Nakai i Nozomu Kawabe. "Properties of AZ31 and AZ91 Sheets Made by Twin Roll Casting". Materials Science Forum 539-543 (marzec 2007): 1650–55. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.1650.

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A feasibility study has been made to produce the Mg alloy sheet of high tensile strength and formability by strip casting and an optimized rolling process. 4mm thickness AZ31 and AZ91 strips were cast successfully. While the microstructure of the cast AZ31 strip consisted of columnar zones, the cast AZ91 strip consisted of fine, equiaxed dendrite and fine precipitations. All samples were rolled to 0.5 mm thickness using an optimized finish-rolling schedule, and their grain size was around 4μm. The ultimate tensile strength (UTS), yield strength (YS) (0.2% offset) and elongation (EL) of the rolled AZ31 sheet were higher than those of commercial AZ31B sheet, and the UTS and YS of the rolled AZ91 sheet were 30% higher than commercial AZ31B sheet. The press formability of the rolled AZ31 and AZ91 sheet was equal or superior to commercial AZ31B sheet.

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Ha, Seon Mi, Sang Shik Kim, Dong Yim Chang, Chang Gil Lee i Sung Joon Kim. "Tensile Properties of Friction Stir Welded AZ31B Mg Alloy". Solid State Phenomena 124-126 (czerwiec 2007): 1357–60. http://dx.doi.org/10.4028/www.scientific.net/ssp.124-126.1357.

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The effect of prior T4 heat treatment and subsequent microstructural evolution on tensile behavior of friction stir welded (FSWed) AZ31B-H24 alloy was examined in this study. Selected AZ31B-H24 plates were prior T4 heat treated at 400 for 24 hours and subsequently friction stir welded. The tensile properties, optical micrographs and SEM fractographs for FSWed AZ31B-T4 specimens were compared with those for the H24 counterparts. Prior T4 heat treatment tended to decrease the tensile ductility reduction in FSWed AZ31B-H24 specimen. The tensile ductility reduction mechanism as associated with prior T4 heat treatment is discussed based on detailed micrographic and fractographic observations.

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Zou, Jian, Zhongmin Shi, Hongwei Xu i Xiaolin Li. "In Vitro Studies on the Degradability, Bioactivity, and Cell Differentiation of PRP/AZ31B Mg Alloys Composite Scaffold". BioMed Research International 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/5763173.

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In recent years, more and more methods have been developed to improve the bioactivity of the biodegradable materials in bone tissue regeneration. In present study, we used rat mesenchymal stem cells (rMSCs) to evaluate the outcomes of Mg alloys (AZ31B, Magnesium, and Aluminum) and Platelet-rich plasma (PRP)/Mg alloys on rMSCs biocompatibility and osteogenic differentiation. Water absorption experiments indicated that both bare AZ31B and PRP/AZ31B were capable of absorbing large amounts of water. But the water absorption ratio for PRP/AZ31B was significantly higher than that for bare AZ31B. The degradability experiments implied that both samples degraded at same speed. rMSCs on the surface of AZ31B distributed more and better than those on the AZ31B scaffold. In ALP activity experiment, the activity of rMSCs on the PRP/AZ31B was markedly higher than that on the AZ31B scaffolds on the 7th day and 14th day. qRT-PCR also showed that OPN and OCN were expressed in both samples. OPN and OCN expression in PRP/AZ31B sample were higher than those in bare AZ31B samples. In summary, the in vitro study implied that AZ31B combined with PRP could remarkably improve cell seeding, attachment, proliferation, and differentiation.

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Hwang, Do Yeon, Akira Shimamoto i Kazuyoshi Takayama. "High-Velocity Impact Characteristic of Mg Alloy and CFRP Composite". Key Engineering Materials 334-335 (marzec 2007): 185–88. http://dx.doi.org/10.4028/www.scientific.net/kem.334-335.185.

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This study examined the dynamic penetration phenomena of high-velocity impact of magnesium alloy CFRP (Carbon Fiber Reinforced Plastic) composite. Test materials for investigation are magnesium alloy(AZ31B), the heat-treated magnesium alloy (AZ31B-200°C, AZ31B-300°C, AZ31B-430°C), and carbon/epoxy laminated composite materials with fiber direction [0°]8, [0°/45°]4s, [ 0°/90°]4s, [ 0°/45°/90°]3s and [ 0°/45°/-45°/90°]2s. We used a ballistic range (one-stage light gas gun), and the test specimens were set at 0°obliquity at room temperature. A high-speed camera allowed us to capture and analyzed the dynamic penetration phenomena of the test specimen.

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Guo, Mei Ling, Ming Jen Tan, Xu Song i Beng Wah Chua. "Numerical and Experimental Investigation on the Hybrid Superplastic Forming of the Conical Mg Alloy Component". Defect and Diffusion Forum 385 (lipiec 2018): 391–96. http://dx.doi.org/10.4028/www.scientific.net/ddf.385.391.

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Hybrid superplastic forming (SPF) is a novel sheet metal forming technique that combines hot drawing with gas forming process. Compared with the conventional SPF process, the thickness distribution of AZ31B part formed by this hybrid SPF method has been significantly improved. Additionally, the microstructure evolution of AZ31 was examined by electron backscatter diffraction (EBSD). Many subgrains with low misorientation angle were observed in the coarse grains during SPF. Based on the tensile test results, parameters of hyperbolic sine creep law model was determined at 400 oC. The hybrid SPF behavior of non-superplastic grade AZ31B was predicted by ABAQUS using this material forming model. The FEM results of thickness distribution, thinning characteristics and forming height were compared with the experimental results and have shown reasonable agreement with each other.

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Hwang, Do Yeon, Akira Shimamoto, Daiju Numata, Takamase Kikuchi i Kazuyoshi Takayama. "Experimental Study of High-Velocity Impact Characteristic of Mg Alloy Using Ballistic Range". Key Engineering Materials 321-323 (październik 2006): 654–57. http://dx.doi.org/10.4028/www.scientific.net/kem.321-323.654.

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In this study, dynamic penetration phenomena of high-velocity impact of magnesium alloy were investigated. The surface hardness of magnesium alloy (AZ31B-O) and the heat-treated magnesium alloy (AZ31B-200°C, AZ31B-300°C, and AZ31B-430°C) were examined using Micro Vickers, and the influence of the heat treatment temperature was observed. We analyzed the metal organization using a microscope. We also used a ballistic range (two-stage light gas gun), and the test specimens were set at 0°obliquity at room temperature. A high-speed camera allowed us to capture and analyzed the dynamic penetration phenomena of the test specimen.

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Coelho, R. S., A. Kostka, Haroldo Pinto, Stefan Riekehr, Mustafa Koçak i Anke Pyzalla. "Microstructure and Residual Stresses in Dissimilar Mg-Al-Zn-Alloy Single Overlap Laser Beam Welds". Materials Science Forum 571-572 (marzec 2008): 361–66. http://dx.doi.org/10.4028/www.scientific.net/msf.571-572.361.

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Microstructure, hardness and residual stresses of the laser beam overlap welds between AZ31B sheets and AZ31, AZ61 and AZ80 extruded profiles are investigated using microscopy and X-ray diffraction. The result of the investigations reveal that weld microstructure, the size of the HAZ, precipitate density and the maximum compressive residual stress values depend strongly on the Al content of the weld zone of two Mg-alloys.

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LOU, X., M. LI, R. BOGER, S. AGNEW i R. WAGONER. "Hardening evolution of AZ31B Mg sheet". International Journal of Plasticity 23, nr 1 (styczeń 2007): 44–86. http://dx.doi.org/10.1016/j.ijplas.2006.03.005.

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Piao, Kun, Kwansoo Chung, Myoung-Gyu Lee i Robert H. Wagoner. "Twinning-Slip Transitions in Mg AZ31B". Metallurgical and Materials Transactions A 43, nr 9 (17.05.2012): 3300–3313. http://dx.doi.org/10.1007/s11661-012-1154-0.

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Daroonparvar, Mohammadreza, Ashish K. Kasar, Mohammad Umar Farooq Khan, Pradeep L. Menezes, Charles M. Kay, Manoranjan Misra i Rajeev K. Gupta. "Improvement of Wear, Pitting Corrosion Resistance and Repassivation Ability of Mg-Based Alloys Using High Pressure Cold Sprayed (HPCS) Commercially Pure-Titanium Coatings". Coatings 11, nr 1 (6.01.2021): 57. http://dx.doi.org/10.3390/coatings11010057.

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In this study, a compact cold sprayed (CS) Ti coating was deposited on Mg alloy using a +high pressure cold spray (HPCS) system. The wear and corrosion behavior of the CS Ti coating was compared with that of CS Al coating and bare Mg alloy. The Ti coating yielded lower wear rate compared to Al coating and Mg alloy. Electrochemical Impedance spectroscopy (EIS) and cyclic potentiodynamic polarization (CPP) tests revealed that CS Ti coating can substantially reduce corrosion rate of AZ31B in chloride containing solutions compared to CS Al coating. Interestingly, Ti-coated Mg alloy demonstrated negative hysteresis loop, depicting repassivation of pits, in contrast to AZ31B and Al-coated AZ31B with positive hysteresis loops where corrosion potential (Ecorr) > repassivation potential (Erp); indicating irreversible growth of pits. AZ31B and Al-coated AZ31B were most susceptible to pitting corrosion, while Ti-coated Mg alloy indicated noticeable resistance to pitting in 3.5 wt % NaCl solution. In comparison to Al coating, Ti coating considerably separated the AZ31BMg alloy surface from the corrosive electrolyte during long term immersion test for 11 days.

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Liu, Hong Tao, Ruo Chao Wang, Qing Liu, Ji Xue Zhou, Yan Fei Chen, Bai Chang Ma i Yuan Sheng Yang. "Microstructure Characterization of AZ31B Mg Alloy Welds Processed by Nd:YAG Laser Welding". Materials Science Forum 898 (czerwiec 2017): 1051–55. http://dx.doi.org/10.4028/www.scientific.net/msf.898.1051.

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The Nd:YAG laser welding process of AZ31B alloys was performed by using the six-axis robot in this work. The microstructure characterization of AZ31B auto-welded joints was studied by using scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). The laser welding process resulted in the formation of equiaxed grains in the center of the fusion zone (FZ) and columnar grains near the FZ boundary, meanwhile some eutectic β-Mg17Al12 particles were observed in the microstructure. No clear heat affected zone (HAZ) was observed in the welded AZ31B joint. Furthermore, some pores were observed in the base material (BM) and FZ.

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12

Sidhu, Ramandeep Singh, Raman Kumar, Ranvijay Kumar, Pankaj Goel, Sehijpal Singh, Danil Yurievich Pimenov, Khaled Giasin i Krzysztof Adamczuk. "Joining of Dissimilar Al and Mg Metal Alloys by Friction Stir Welding". Materials 15, nr 17 (26.08.2022): 5901. http://dx.doi.org/10.3390/ma15175901.

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In engineering applications, such as automobile, marine, aerospace, and railway, lightweight alloys of aluminum (Al) and magnesium (Mg) ensure design fitness for fuel economy, better efficiency, and overall cost reduction. Friction stir welding (FSW) for joining dissimilar materials has been considered better than the conventional fusion welding process because of metallurgical concerns. In this study, dissimilar joints were made between the AA6061 (A), AZ31B (B), and AZ91D (C) combinations based on the varying advancing side (AS) and retreating side (RS). The dissimilar joints prepared by the FSW process were further characterized by tensile testing, impact testing, corrosion testing, fracture, and statistical and cost analysis. The results revealed a maximum tensile strength of 192.39 MPa in AZ91 and AZ31B, maximum yield strength of 134.38 MPa in a combination of AA6061 and AZ91, maximum hardness of 114 Hv in AA6061 and AZ31B, and lowest corrosion rate of 7.03 mV/A in AA6061 and AZ31B. The results of the properties were supported by photomicrographic fracture analysis by scanning electron microscopy (SEM) observations. Further, the performance of dissimilar joints was statistically analyzed and prioritized for preference by similarity to the ideal solution (TOPSIS) method.

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13

Anish, R., M. S. Pragash i G. Robert Singh. "Development and Characterization of AZ31B Mg Alloy Using Powder Metallurgy Technique Followed by Hot Extrusion". Advanced Materials Research 984-985 (lipiec 2014): 124–28. http://dx.doi.org/10.4028/www.scientific.net/amr.984-985.124.

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In this study AZ31B Mg alloy is developed by powder metallurgy route followed by hot extrusion. The extruded materials were characterized for microstructure, X-ray diffraction (XRD), density, porosity and mechanical properties such as tensile, compression, impact and micro hardness. The SEM analysis of fractured surface of AZ31B Mg alloy showed quasi-cleavage fracture mode.

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14

Ma, Chun Sheng, Hai Long Fu, Hao Li, Xiao Luo, Yang Li i Yong Zhou. "Mechanical Behavior of AZ31B Magnesium Alloy Sheet at Different Strain Rates and Stress States". Materials Science Forum 867 (sierpień 2016): 3–7. http://dx.doi.org/10.4028/www.scientific.net/msf.867.3.

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This Magnesium (Mg) alloys have been increasingly used in the automotive industry due to their superior mechanical properties compared with other metals. While there are some obstacles in the application of Mg alloy, one of that is its complex dynamic response characteristic. Many papers have studied the tensile and compression properties of AZ31B Mg alloys sheet, but lack of shear test. This paper presents experimental study, including the test method and test data analysis, on the AZ31B Mg alloy sheet. Uniaxial tension tests were carried out over a wide range of strain rates from to , which are of interest in vehicle crash CAE. At the same time uniaxial compression and shear tests at strain rates from to were also carried out. The different mechanical behavior of AZ31B Mg alloys sheet between tensile, compression and shear stress states can also be studied in this paper.

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Wang, Hongyang, Nan Li i Liming Liu. "Investigation of the Joining Technology of FRP/AZ31B Magnesium Alloy by Welding and Riveting Hybrid Bonding Method". Materials 12, nr 13 (5.07.2019): 2167. http://dx.doi.org/10.3390/ma12132167.

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A novel joining technology was applied to join Fiber Reinforced Polymer (FRP) and AZ31B Mg alloy, which combined the laser-arc welding source and riveting joining methods. The design idea of the stepped rivet was proposed. The weld morphology, mechanical properties, microstructures of welds under two different rivet structures were investigated. FRP and AZ31B Mg could be joined successfully by the new hybrid joining method when it used two different structural rivets. The maximum tensile shear load of the joint under stepped rivet of small size was only 800 N, while that of the joint under stepped rivet of the larger size could reach 1419 N, nearly 90% of that of FRP. There was no reaction between the FRP plate and AZ31B rivet. While the magnesium elements and aluminum elements diffused and reacted with other elements in the FRP plate/AZ31B plate interface.

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Sunada, Satoshi, Takahito Kawamura, Katsuyoshi Kondoh, Hisakimi Notoya i Kazuhiko Majima. "Electrochemical Dissolution Characteristics of Magnesium Alloy Produced by Roll Compaction Process". Materials Science Forum 561-565 (październik 2007): 2143–46. http://dx.doi.org/10.4028/www.scientific.net/msf.561-565.2143.

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The extruded AZ31B Mg alloy specimens using powders fabricated by roll compaction processing (RCP) was prepared, and their corrosion behavior has been investigated through the polarization test, electrochemical impedance spectroscopy test, immersion test and SEM observation in comparison to that of the conventional AZ31B Mg alloy, hereafter shortened as I/M specimen. The extruded AZ31B Mg alloys using RCP powder showed little change in Ecorr irrespective of number of pass cycles. Both anodic and cathodic current density suppression of the RCP specimens became larger with an increase in number of pass cycles. It was also confirmed that the corrosion characteristics of the RCP specimens depended strongly on their structural morphology and that the corrosion resistance of the RCP specimens subjected to 50 pass cycles was nearly same as that of the I/M specimen.

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Chang, Woong Seong, Heung Ju Kim i Sung Wook Kim. "Microstructure and Mechanical Properties of Dissimilar Joints of AZ31 MG Alloy to Aluminium Alloys". Materials Science Forum 638-642 (styczeń 2010): 214–19. http://dx.doi.org/10.4028/www.scientific.net/msf.638-642.214.

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In attempts to improve the performance of dissimilar joints between AZ31 Mg alloy and different Al alloys, solid state joining processes such as Magnetic Pulse Welding (MPW) and Friction Stir Welding (FSW) were applied for minimizing the formation of brittle intermetallic phases. MPW process has been concentrated mainly on round section tube to tube and tube to bar welds. Mg alloy AZ31 has been successfully welded to pure Al A1070 as well as to Al alloy A3003. Tensile test clearly showed the MPW welds were stronger than the weaker of the base metal so failure occurred in aluminum base metal. While FSW process for the dissimilar joint between AZ31B/A6061 alloys with a thickness of 2mm revealed optimum weldability under the conditions of travel speed of 0.8mm/sec and tool rotation speed of 850rpm. For the sound dissimilar joint, the maximum tensile strength of 179 MPa, which was about 80 % of the Mg base metal tensile strength, has been obtained.

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Kramár, Tomáš, Petr Vondrouš, Miroslav Jáňa i Tomáš Kupec. "JOINIG OF MG ALLOY AZ31B BY SELECTED TECHNOLOGIES". Acta Polytechnica 59, nr 3 (1.07.2019): 292–98. http://dx.doi.org/10.14311/ap.2019.59.0292.

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This contribution presents metallurgical joining of Mg alloy AZ 31B by several technologies - Friction Stir Welding - FSW, Laser Beam Welding - LBW, soldering and their mutual comparison. The difficulty of joining Mg alloys is connected with the strong MgO layer, low ductility of the weld metal (WM), a presence of intermetallic phases connected with the hardness increase. To successfully join Mg alloys, a precise setting of welding parameters is needed. The welds are susceptible to low mechanical properties as all samples fractured at WM. From the tested methods, laser beam welding proved the best results, because laser welding is the fastest and weld strength reached the highest values, i.e. 87% of BM (base metal) strength.

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YAN, TINGTING, LILI TAN, DANGSHENG XIONG, BINGCHUN ZHANG i KE YANG. "A MANGANESE OXIDE CONTAINED COATING FOR BIODEGRADABLE AZ31B MAGNESIUM ALLOY". Surface Review and Letters 16, nr 04 (sierpień 2009): 533–38. http://dx.doi.org/10.1142/s0218625x09012937.

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A manganese oxide contained coating was prepared on biodegradable AZ31B magnesium alloy to control the degradation of AZ31B and improve its biocompatibility. Morphology, composition, and corrosion resistance of the coating were studied. The SEM observations showed that the coating was approximately 4–6 μm in thickness with net-like microcracks. The XPS analysis indicated that the coating was mainly composed of MgO , Mg ( OH )2, MnO 2, Mn 2 O 3, and Mn 3 O 4. It was found that AZ31B with such coating showed better corrosion resistance in simulated blood plasma through electrochemical and immersion tests. The hemolytic assay indicated that the treated AZ31B had no hemolytic effect.

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Chang, Woong Seong, Heung Ju Kim, Joong Suk Noh i Han Sur Bang. "The Evaluation of Weldability for AZ31B-H24 and AZ91C-F Mg Alloys in Friction Stir Welding". Key Engineering Materials 321-323 (październik 2006): 1723–28. http://dx.doi.org/10.4028/www.scientific.net/kem.321-323.1723.

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In the present study, an investigation has been carried out on the friction stir welding (FSW) of two magnesium alloys. Hot-rolled and Die-casting plates of AZ type magnesium alloys were successfully joined by friction stir welding. AZ31B-H24 and AZ91C-F plates with the thickness of 4mm were used, and the microstructural development in stir zone (SZ) was investigated using optical and scanning electron microscopes. Hardness of SZ in AZ31B-H24 alloy has been slightly decreased due to the coarse structure. On the other hand, Hardness of SZ in AZ91C-F alloy has been remarkably increased due to very fine recrystallized grain structure. The result of EPMA showed Al Solid solution hardening by Solid solution of β intermetallic compound to α-Mg. While tensile strength of the FSWelded AZ31B-H24 alloy showed about 80% values compare to Base metal, AZ91C-F showed about 68% values due to strongly affected by formation of the intermetallic compounds, β-Al12Mg17.

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Lee, G. H., T. W. Yoon i C. Y. Kang. "A Study on the Mechanical Properties and Formability of Mg AZ31B Sheet". Transactions of Materials Processing 23, nr 8 (1.12.2014): 495–500. http://dx.doi.org/10.5228/kstp.2014.23.8.495.

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Tolun, Fatmagül. "Effect of tool rotational speed and position on mechanical and microstructural properties of friction stir welded dissimilar alloys AZ31B Mg and Al6061". Materials Testing 64, nr 5 (1.05.2022): 714–25. http://dx.doi.org/10.1515/mt-2021-2080.

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Abstract The existence of some problems in joining Al and Mg alloys using classical fusion welding methods causes limitations in the use of Mg and Al alloys in common structures. Friction stir welding (FSW) is a solid-state welding method for joining materials having same or different properties at temperatures below their melting points. In this study, dissimilar alloys AZ31B Mg and Al6061 were joined by FSW at a feed rate of 34 mm·min−1 and at different tool rotational speeds (600 and 700 rpm) and material positions. During the welding process, AZ31B Mg plate was positioned at the advancing side and Al6061 was located at the retreating side, and moreover, the two alloys were also positioned vice versa. Tensile strength and microhardness tests were performed to examine the mechanical properties of the welded specimens. The microstructures of the welded zones were examined by obtaining the optical microscopic (OM) and scanning electron microscopic (SEM) images. The highest welding strength was obtained from the specimen welded at a tool rotational speed of 600 rpm, at a feed rate of 34 mm·min−1 and by locating AZ31B Mg on the advancing side.

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Nishinaka, K., S. A. Salman, K. Kuroda i M. Okido. "Characterization and Structure Analysis of the Anodic Film Formed on AZ31 Mg Alloy in KOH Alkaline Solution with Various Additives". Key Engineering Materials 786 (październik 2018): 159–64. http://dx.doi.org/10.4028/www.scientific.net/kem.786.159.

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AZ31B Mg alloy was anodized under the current density of 20 mA cm-2 for 3.6 ks in KOH alkaline solutions contains 0.60 M KF, 0.09 M Na3PO4.12H2O, 0.45 M Al (OH)3and 0.13 M KMnO4at 298 °C. Pores structure anodic film was formed on magnesium alloy surface; the pours structure was also observed in the lower part of the anodic film. The anodic film consisted of MgO and MgAl2O4. The anodized film showed higher pitting potential from anodic polarization measurement in 0.1 M NaCl solution compared to non-anodized magnesium alloy specimen and leads to improve the corrosion resistance of anodized AZ31 magnesium alloy.

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Jin, Yu Hua, Zhen You Huang i Chang Feng Li. "Interface Characterization and Materials Flow Pattern Analysis for Friction Stir Welding Overlap Joints of Mg/Al Dissimilar Alloys". Applied Mechanics and Materials 624 (sierpień 2014): 106–13. http://dx.doi.org/10.4028/www.scientific.net/amm.624.106.

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In this paper, the interface characterization and materials flow pattern of overlap joints of dissimilar alloys of 6061-T6 aluminum alloy and AZ31B magnesium alloy welded by friction stir overlap welding with a reverse conical pin tool were investigated. The results shown that: when AZ31B magnesium alloy sheet was placed over 6061-T6 aluminum alloy sheet, and AZ31B magnesium alloy sheet was settled at advancing side while 6061-T6 aluminum alloy sheet was at retreating side, it could eliminate the influence of migration interface on the strength of the lap joints. What is more, the intermetallic compound Mg17Al12 were formed at advancing side of magnesium alloy sheet and retreating side of initial interface between magnesium alloy sheet and aluminum alloy sheet. According to the distribution of intermetallic compound and the characteristics of migration interface, the plastic flowing pattern of metal in welding process was also evaluated.

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García-Galvan, Federico R., Santiago Fajardo, Violeta Barranco i Sebastián Feliu. "Experimental Apparent Stern–Geary Coefficients for AZ31B Mg Alloy in Physiological Body Fluids for Accurate Corrosion Rate Determination". Metals 11, nr 3 (27.02.2021): 391. http://dx.doi.org/10.3390/met11030391.

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The corrosion behavior of AZ31B Mg alloy exposed to Ringer’s, phosphate-buffered saline (PBS), Hank’s, and simulated body fluid (SBF) solutions for 4 days was investigated using electrochemical impedance spectroscopy (EIS), potentiodynamic polarization, weight loss, and surface characterization. Changes in corrosion rates with immersion time determined by weight loss measurements were compared with EIS data to determine the possibility of obtaining quantitative electrochemical information. In addition, changes in the protective properties of the corrosion product layer calculated from the EIS parameters were evaluated as a function of their surface chemical composition as determined by X-ray photoelectron spectroscopy (XPS) and visual observations of the corroded specimen’s surface. Apparent Stern–Geary coefficients for the AZ31B Mg alloy in each test solution were calculated using the relationship between icorr from weight loss measurements and the EIS data (both Rp and Rt). This provided experimental reference B′ values that may be used as a useful tool in independent investigations to improve the accuracy of corrosion rates of AZ31B Mg alloy in simulated body solutions.

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Luo, Chang Zeng, Wei Liang, Xian Rong Li i Ya Jun Yao. "Study on Interface Characteristics of Al/Mg/Al Composite Plates Fabricated by Two-Pass Hot Rolling". Materials Science Forum 747-748 (luty 2013): 346–51. http://dx.doi.org/10.4028/www.scientific.net/msf.747-748.346.

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In this study, 5052/AZ31B/5052 composite plates were fabricated by two-pass hot rolling, under the rolling parameters 623 K/15 min/40% for the first pass and 673 K/10 min/50% for the second pass. The structure and element change in the zone of the joint interface were studied by means of optical microscope (OM), scanning electron microscope (SEM), and energy diffraction spectrum (EDS). The results showed that the bonding mode of the joint interface between AZ31B and 5052 alloy was metallic bonding after the first pass hot rolling, but the bonding mode of the finished composite plate appeared the distribution characteristic alternating with metallic bonding and metallurgical bonding. Two distinct intermediate layers including Mg17Al12and Al3Mg2can be clearly observed in the joint interface. During the second pass hot rolling, the AZ31B and 5052 layer were elongated along the rolling direction, while the Al3Mg2and Mg17Al12layers were up in the joint interface. After the tensile strength testing of the composite plate, the interface bonding appeared very well without any debonding.

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Shaha, S. K., S. B. Dayani i H. Jahed. "Fatigue life enhancement of cast Mg alloy by surface modification in cold spray process". MATEC Web of Conferences 165 (2018): 03014. http://dx.doi.org/10.1051/matecconf/201816503014.

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To improve the fatigue life of Mg alloy, high strength AA7075 spherical powder was deposited on AZ31B samples in nitrogen carrier gas environment at 400°C temperature in cold spray process followed by electrostatic painting with zinc phosphate. The fully reverse four-point rotating-bending fatigue tests were conducted on the coated and uncoated samples in different environmental conditions. It is seen that the cold sprayed AA7075 improved the yield strength of the AZ31B cast alloy. Similarly, a significant fatigue enchantment was observed in the coated samples, reaching a fatigue strength of 90 MPa compared to as-cast fatigue strength of 70 MPa at 107 cycles when tested in air, and fatigue strength of 80 MPa under a 3.5%NaCl testing environment. The SEM analysis at the interface of the tensile tested sample exhibited the interfacial fracture followed by delamination of the coating. Similarly, delamination of coating was merely detected in the fatigue fracture sample tested in the air, while the sample tested in the corrosive environment showed pits which allowed the solution to penetrate in the AZ31B substrate results delamination and premature failure. However, the presence of e-paint forms a passive layer which is hindering the pit formation and extending the fatigue life.

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Chung, Dong Seok, Y. G. Kim, S. H. Lee, B. O. Park i J. K. Kim. "The Influence of Welding Conditions on Mechanical Properties and Microstructural Change of TIG Welded Joint in Extruded Plate AZ31B Mg Alloy". Key Engineering Materials 345-346 (sierpień 2007): 1441–44. http://dx.doi.org/10.4028/www.scientific.net/kem.345-346.1441.

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This present work investigated the influence of welding conditions, such as welding current, diameter of welding wire on the microstructural change, and mechanical properties of TIG welded joint in extruded AZ31B Mg plate. It was found that a good and sound welded joint was achieved in all welding conditions. The grain size decreased with increasing welding current and decreasing diameter of welding wire. In addition, the second phases were homogeneously distributed in the grain and grain boundary as the welding current and the diameter of the welding wire were decreased. β discontinuous precipitates were observed in the welded joint; this microstructure has not been reported by previous researches investigating AZ31B Mg alloy. The hardness value was affected by the existence state of the second phase and the hardness of the welded joint region was lower than the other regions in welded AZ31B Mg alloy. The strength of the welded joint region was influenced by the grain size and had more than 90 %, compared to that of ASTM standard specification.

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Sukmana, Irza, Fauzi Ibrahim, Mohammad Badaruddin i Hadi Nur. "Low cycle fatigue properties of extruded magnesium AZ31B". FME Transactions 50, nr 3 (2022): 422–32. http://dx.doi.org/10.5937/fme2203422s.

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The low cycle fatigue behavior of magnesium (Mg) AZ31B was observed at room temperature, in which its extrusion process led to differences in tensile and compressive stresses, with an increase in the grain structure and mechanical properties. The extrusion process results showed changes in the microstructure due to cyclic load-deformation at the longitudinal section with grain direction and shape. Furthermore, Mg AZ31B also showed transitional behavior from cyclic softening to hardening when the strain amplitude was increased. At a strain amplitude of 0.006 - 0.01 mm/mm, the Bauschinger phenomenon was observed. The effect factor was calculated by the yield stress and strain at compression stress. Furthermore, precipitation or local failure of the second phase was the main factor that caused the Bauschinger phenomenon. The fatigue fracture characteristics based on deformation due to cyclic loading include precipitation, fatigue striation, dimples, micro-cracks, and beach mark fatigue. Therefore, the correlation of the total failure cycle with plastic and the elastic strain was obtained as an equation to predict the lifespan of Mg AZ31B.

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Maqsood, Muhammad Faheem, Mohsin Ali Raza, Zaeem Ur Rehman, Asima Tayyeb, Muhammad Atif Makhdoom, Faisal Ghafoor, Umar Latif i Muhammad Farooq Khan. "Role of Solvent Used in Development of Graphene Oxide Coating on AZ31B Magnesium Alloy: Corrosion Behavior and Biocompatibility Analysis". Nanomaterials 12, nr 21 (25.10.2022): 3745. http://dx.doi.org/10.3390/nano12213745.

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Clinical applications of bio-absorbable magnesium (Mg) and its alloys can be enhanced by increasing their corrosion resistance, using surface modification and functionality. In this study, we synthesized graphene oxide (GO) through improved Hummers’ method and deposited it on biodegradable AZ31B Mg alloy for further characterization. Different suspensions of GO were prepared in various solvents, like deionized water, ethanol, and acetone by ultra-sonication. Electrophoretic deposition (EPD) was used to develop GO coatings on AZ31B Mg using different GO suspensions. Effect of various solvents on corrosion behavior, as well as in vitro biocompatibility, was studied. The optimized EPD parameters were 3 volts and 90 s for coating. Different characterization techniques were used to study GO and prepared coatings. Atomic force microscopy found that the average thickness of GO was ~1 nm. Electrochemical behavior of coatings was studied through electrochemical impedance spectroscopy (EIS) and Tafel analysis in Ringer’s lactate solution. Tafel analysis revealed that GO coatings deposited by GO water suspension increased corrosion protection efficiency of AZ31B Mg alloy by ~94%. After 72 h incubation in MC3T3-E1 osteoblast cells extract, in vitro analysis was performed to determine the cell viability and biocompatibility of the GO- coated and bare Mg samples. GO coatings deposited by GO water suspension demonstrated ~2× cell viability, as well as nontoxicity and better biocompatibility compared to the bare and other GO-coated Mg samples.

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Kapustová, Mária, i Mariana Balážová. "The Analysis of Temperature and Strain Rate Influence on Flow Stress of Mg Alloy AZ31". Applied Mechanics and Materials 752-753 (kwiecień 2015): 448–51. http://dx.doi.org/10.4028/www.scientific.net/amm.752-753.448.

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This contribution analyses influence of thermo mechanical conditions of magnesium alloy - type AZ31 forming on its flow stress. Temperature and strain/deformation rate belong to the essential thermo mechanical parameters of strain/deformation process. A testing cylinder made of selected Mg alloy was strained using pressure at warm temperatures within defined two degrees of nominal strain 30% and 60% and strain rate of 5 s-1. The pressure test at warm temperatures was conducted at testing temperatures 250, 300 and 350°C. It is important to explore the temperature influence on AZ31 alloy flow stress in order to reduce energy consumption of formed pieces production. Surface quality and precision of required dimension will improve, as well. The experiment was aimed at graphic evaluation of temperature influence on flow stress of Mg alloy AZ31B. Resulting form flow stress curve it is possible to read out its value for particular strain. These values are essential for calculation of forming force and work. For magnesium alloy AZ31 warm forming at temperature interval of 230 - 425°C is typical. The pressure tests were realized within the temperature interval of 250 - 350°C, i. e. at temperatures belonging to lower limit of recommended temperature interval, with the aim of acquirement as much information as possible on Mg alloy behavior at low forming temperatures.

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Mousa, Hamouda M., Kamal H. Hussein, Ahmed A. Raslan, Joshua Lee, Heung M. Woo, Chan Hee Park i Cheol Sang Kim. "Amorphous apatite thin film formation on a biodegradable Mg alloy for bone regeneration: strategy, characterization, biodegradation, and in vitro cell study". RSC Advances 6, nr 27 (2016): 22563–74. http://dx.doi.org/10.1039/c5ra25306c.

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Bioactive films with a nanoplate structure were prepared on the surface of a biodegradable AZ31B magnesium (Mg) alloy via anodization in simulated body fluid (SBF) as an electrolyte to control Mg biodegradability and improve surface bioactivity.

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Gontarz, Andrzej, Krzysztof Drozdowski, Jacek Michalczyk, Sylwia Wiewiórowska, Zbigniew Pater, Janusz Tomczak, Grzegorz Samołyk, Grzegorz Winiarski i Piotr Surdacki. "Forging of Mg-Al-Zn Magnesium Alloys on Screw Press and Forging Hammer". Materials 14, nr 1 (23.12.2020): 32. http://dx.doi.org/10.3390/ma14010032.

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Magnesium alloys are highly strain rate sensitive and exhibit good workability in a narrow forging temperature range. Consequently, parts made of these materials are usually forged with low-speed hydraulic presses, using specially designed tool heating systems in order to ensure near-isothermal conditions. This study investigates whether popular magnesium alloys such as Mg-Al-Zn can be forged in forging machines equipped with high-speed forming tools. Experimental upset forging tests on AZ31B, AZ61A and AZ80A specimens were conducted, using a screw press with a ram speed of 0.5 m/s and a die forging hammer with a ram speed at stroke of about 5 m/s. Test specimens were preheated to 350 °C, 410 °C and 450 °C. After the upset forging process, they were air- or water-cooled and then examined for their workability, hardness and grain size. To validate the results, a forging process for a producing handle was designed and modelled by the finite element method. Distributions of strain, temperature and fracture criterion were analysed, and energy and force parameters of the forging process were calculated. After that, experimental tests were performed on AZ31B and AZ61A specimens in order to determine mechanical properties of forged parts and examine their micro- and macrostructure. Results have demonstrated that AZ80A is not suitable for forging with either the screw press or the die forging hammer, that AZ61A can be press- and hammer-forged but to a limited extent, and that AZ31B can be subjected to forging in both forging machines analysed in the study.

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Guo, Xinghua, Quanzhong Guo, Keqin Du, Yong Wang i Fuhui Wang. "Study of filiform corrosion inhibition by a compact plasma electrolytic oxidation film on a AZ31 Mg alloy". RSC Advances 6, nr 45 (2016): 39053–62. http://dx.doi.org/10.1039/c5ra26905a.

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Bilgin, Musa, Şener Karabulut i Ahmet Özdemir. "Sürtünme Karıştırma Kaynağı ile Birleştirilmiş AA7075 ve AZ31B Alaşımlarının Kaynak Kalitesi Üzerine Çalışma". Academic Perspective Procedia 2, nr 3 (22.11.2019): 1058–66. http://dx.doi.org/10.33793/acperpro.02.03.118.

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Bu &ccedil;alışmada AZ31B magnezyum ve AA7075 al&uuml;minyum plakalar s&uuml;rt&uuml;nme karıştırma kaynağı y&ouml;ntemi ile birleştirilmiş ve numunelerin kaynak kalitesi tahribatlı ve tahribatsız muayene y&ouml;ntemleri kullanılarak incelenmiştir. Kaynatılmış numuneleri kıyaslamak i&ccedil;in AA7075-AA7075, AZ31B-AZ31B ve AA7075-AZ31B plakalar, 500 dev/dak takım d&ouml;nme hızı, 20 mm/dak takım ilerleme hızı ve 0,8 mm ilerleme tarafına takım ofseti ile 1&deg;&rsquo;lik takım a&ccedil;ısı birleştirilmişlerdir. Hızlı soğuma sonucu oluşan termal &ccedil;atlakları &ouml;nlemek i&ccedil;in kaynak hattına sıcak hava uygulaması yapılmıştır. Birleştirilen numunelerin kaynak kalitesi sıvı penetrant, radyografik inceleme ve &ccedil;ekme testi deneyleri ile araştırılmıştır. Test sonu&ccedil;ları kaynak k&ouml;k&uuml; &uuml;zerinde başarılı bir birleştirmenin elde edildiğini ancak karıştırma b&ouml;lgesinde t&uuml;nel oluşumunun meydana geldiğini g&ouml;stermiştir. Aynı &ouml;zellikteki Al-Al ve Mg-Mg plakalarının SKK y&ouml;ntemi ile birleştirilmesinde kabul edilebilir bir &ccedil;ekme dayanımı değeri elde edilirken farklı &ouml;zellikteki Al ve Mg alaşımlarının birleştirilmesinde ise daha d&uuml;ş&uuml;k &ccedil;ekme dayanımı oluştuğu g&ouml;r&uuml;lm&uuml;şt&uuml;r.

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Zhang, Shuai, Mengcheng Gong, Ling Cen, Yang Lu i Ming Gao. "Differences in Properties between Hybrid Wire Arc Additive-Milling Subtractive Manufactured Aluminum and Magnesium Alloys". Applied Sciences 13, nr 4 (20.02.2023): 2720. http://dx.doi.org/10.3390/app13042720.

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Hybrid wire arc additive-milling subtractive manufacturing (HWMM) is an effective way to improve the quality of complex metal components, but the difference in the properties of the aluminum alloy and magnesium alloy fabricated by HWMM has been not addressed. In the paper, the differences in deposition accuracy and tensile anisotropy between the Al5Si Al and AZ31B Mg alloys were studied by using the HWMM method. Under the optimal parameters, the minimum surface roughness of the AZ31B sample was 146.1 μm, which was 90% higher than for the Al5Si sample. The differences in the tensile strength and elongation of the AZ31B sample were 32% and 56%, respectively, being 6 and 3.3 times higher than those of the Al5Si samples. According to the fracture behavior of the samples, the tensile anisotropy of both alloys was mainly attributed to defects such as incomplete fusion and porosity in the fusion line. However, there was obvious structural inhomogeneity in AZ31B samples, where the grain size difference between adjacent areas reached 40%. This led to the easier fracture of AZ31B samples. These results contribute to our understanding of the HWMM of light alloys.

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Yang, Li Hui, Mi Lin Zhang, Cun Guo Lin i Jian Hua Wu. "Effect of Additives on Structure and Corrosion Resistance of Molybdate Conversion Coatings Deposited on AZ31B Mg Alloy". Advanced Materials Research 308-310 (sierpień 2011): 2458–62. http://dx.doi.org/10.4028/www.scientific.net/amr.308-310.2458.

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Molybdate conversion coatings were prepared on AZ31B Mg alloy in a molybdate based solution with additives of sodium fluoride (NaF) or lanthanum nitrate (La(NO3)3). The effects of F- and La3+ additives on the morphology and on the corrosion resistance of the molybdate coatings were investigated by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and potentiodynamic polarization analysis. The results revealed that these additives could accelerate the deposition of molybdenum on the surface of AZ31B magnesium alloy. It can be seen that the composite conversion coatings consist of many spherical particles. It is also found that the corrosion resistance is greatly improved after molybdate treatment. The films formed in F- additive solution showed lower corrosion current density than in La3+ additive solution.

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Wu, Si Yu, Qiang Guo Chen, Jing Jing Xu, Ting Ting Yan i Qing Hua Chen. "Biodegradability of AZ31B Magnesium Alloy with a Permanganate Conversion Coating". Applied Mechanics and Materials 707 (grudzień 2014): 163–67. http://dx.doi.org/10.4028/www.scientific.net/amm.707.163.

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Magnesium alloy has been considered as a revolutionary biodegradable material, but the fast degradation limits its development. A permanganate conversion coating for AZ31B magnesium alloy prepared, in order to improve its anti-corrosion property. The morphology and composition of the coating were characterized with scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy dispersion spectroscopy (EDS), which showed that the coating was 40-170μm in thickness, with net-like micro-cracks, and was tightly combined with AZ31B magnesium alloy matrix. The main compositions of the coating were Mg and a series of oxides of Mn. Observed by the tests of electrochemical and immersion,the corrosion resistance of AZ31B magnesium alloy can be improved significantly through the permanganate conversion treatment

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Yu, Zijing, Jianguo Gao, Zhaofang Su, Hongchang Zhang, Yinan Li i Zilong Peng. "Microstructure and Mechanical Properties of AZ31B/LY12 Joints Using Zn/Ag–Cu–Zn/Zn Multi-Interlayers via Ultrasound-Assisted Transient Liquid Phase Bonding". Metals 12, nr 6 (26.05.2022): 909. http://dx.doi.org/10.3390/met12060909.

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The use of a Zn/Ag–Cu–Zn/Zn multi-interlayer was observed to avoid the formation of Mg–Al binary intermetallic compounds (IMCs), which cause embrittlement and low strength of bonding when dissimilar metals such as Mg/Al are joined using ultrasound-assisted transient liquid phase bonding (U-TLP). The change in the microstructure and mechanical properties of the AZ31B/LY12 joints at 410, 440, and 460 °C with prolonging ultrasonic treatment (UST) time was investigated. The results showed that the diffusion of Ag and Cu was faster into the brazing seam on the LY12 side than that on the AZ31B side with increasing UST and temperature. The IMCs on both sides of the joints were transformed with the diffusion of Ag and Cu. The transformation made the fracture path shift from the AZ31B side (410, 440 °C) to the LY12 side (460 °C), and the maximum shear strength of the joints from 43.3 (410 °C) to 65.7 (440 °C) to 84.7 MPa (460 °C). The IMCs on the surface of the fracture path corresponding to the joints with optimal mechanical properties changed from Mg7Zn3+MgZn2+α-Mg (410 °C) to MgZnCu+Mg7Zn3 (440 °C) to Al2Cu (460 °C).

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Ando, Shinji, Kazuaki Toda, Masayuki Tsushida, Hideki Tonda i Yoshihito Kawamura. "Fatigue Fracture Behavior of Mg-Zn-Y Alloy". Key Engineering Materials 326-328 (grudzień 2006): 975–78. http://dx.doi.org/10.4028/www.scientific.net/kem.326-328.975.

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Recently, Mg-Zn-Y alloys with superior performance, which have a long period order (LPO) phase, have been developed. Therefore, it is important to understand fundamental fatigue properties in such materials. In this study, the fatigue fracture behavior of Mg-Zn2-Y2-Zr0.2 alloy has been investigated using a plain fatigue bending testing machine, which was originally developed for thin sheet specimen. One end of the sheet specimen is fixed at a voice coil of the loudspeaker and the other end is set free. A bending mode resonance occurs in the specimen due to forced vibration at the fixed end. To estimate stress amplitude of bending, deflections at the free end of the specimen oscillating at a frequency of about 250~700Hz was measured by a laser displacement gauge. For comparison, AZ31B alloy also has been investigated. S-N curve for the Mg-Zn2-Y2-Zr0.2 alloy was obtained using a stress ratio of R=-1, and the fatigue strength was estimated as about 200MPa at 106~108 cycles. The value corresponds to about 50% of 0.2% proof strength of the alloy. Two types of fatigue surface were observed in the alloy. One is striation like pattern and the other is relatively flat surface. The former is similar to fatigue surface of AZ31B. Therefore, these two types of fatigue surface correspond to crack passing through α-Mg phase and LPO phase, respectively.

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Yu, Si Rong, i Xian Jun Chen. "Microstructures and Properties of FSW Joints of AZ31B Mg Alloy". Advanced Materials Research 291-294 (lipiec 2011): 855–59. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.855.

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The extruded AZ31B Mg alloy sheet was welded with friction stir welding. The microstructures and mechanical properties of the welded joint were investigated. The results show that the grains in the weld nugget zone were small, uniform and equiaxed. The grains in thermo-mechanical affected zone were stretched and relatively small, but were not as small and uniform as those in the weld nugget zone. The grains in the heat-affected zone were relatively coarse. The fracture of the welded joint occurred mainly in the heat affected zone. The tensile strength of the welded joints was up to 257.4 MPa and was 87.9% of the base material strength. The microhardness in the weld nugget zone was higher. The microhardness in the thermo-mechanical affected zone and heat affected zone were lower than that in the weld nugget zone. The microhardness in the weld nugget zone increased from the upper surface to the bottom.

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Aiello, Ashlee, i Karl Sieradzki. "Corrosion of Commercial Mg–Al Alloys: AZ31B, AM60, and AZ91D". Journal of The Electrochemical Society 167, nr 10 (29.06.2020): 101510. http://dx.doi.org/10.1149/1945-7111/ab9cd6.

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Lloyd, J. T., i R. Becker. "Stress-based crystal analysis of yielding in rolled Mg AZ31B". Philosophical Magazine 96, nr 4 (20.01.2016): 370–86. http://dx.doi.org/10.1080/14786435.2015.1132854.

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Krywopusk, N. M., L. J. Kecskes i T. P. Weihs. "Microstructural characterization of pure Mg and AZ31B processed by ECAE". Materials Characterization 158 (grudzień 2019): 109950. http://dx.doi.org/10.1016/j.matchar.2019.109950.

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Nastac, L., i N. El-Kaddah. "Microstructure Evolution of Cast Mg AZ31B Alloy at Low Superheat". International Journal of Metalcasting 7, nr 1 (styczeń 2013): 39–48. http://dx.doi.org/10.1007/bf03355543.

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Brown, Donald W., A. Jain, Sean R. Agnew i Bjørn Clausen. "Twinning and Detwinning during Cyclic Deformation of Mg Alloy AZ31B". Materials Science Forum 539-543 (marzec 2007): 3407–13. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.3407.

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Textured Mg alloys exhibit tension – compression strength asymmetry due to mechanical twinning. The distinction arises as the material deforms primarily by slip in one direction and by twinning in the other. In-situ neutron diffraction during cyclic loading in tension and compression of extruded bar allows study of the effect of twinning on subsequent load reversals. The diffraction data reveal the texture evolution and internal stress development as a function of deformation. De-twinning resulted in complete texture reversal during initial cycles, but eventually “fatigued” resulting in some residual twin component.

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Wang, H. Y., L. M. Liu, M. L. Zhu i H. Wang. "Laser weld bonding of A6061Al alloy to AZ31B Mg alloy". Science and Technology of Welding and Joining 12, nr 3 (kwiecień 2007): 261–65. http://dx.doi.org/10.1179/174329307x159784.

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Ho, Yee-Hsien, Hitesh D. Vora i Narendra B. Dahotre. "Laser surface modification of AZ31B Mg alloy for bio-wettability". Journal of Biomaterials Applications 29, nr 7 (8.09.2014): 915–28. http://dx.doi.org/10.1177/0885328214551156.

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Yang, Q., i A. K. Ghosh. "Formability of Ultrafine-Grain Mg Alloy AZ31B at Warm Temperatures". Metallurgical and Materials Transactions A 39, nr 11 (8.08.2008): 2781–96. http://dx.doi.org/10.1007/s11661-008-9551-0.

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Han, Li, Pei Peng Jin, Jin Hui Wang, Yun Peng Zhu i Jie Xie. "The Growth Mechanism of MgO in the ZnO Coated Mg₂B₂O₅ Whisker Reinforced AZ31B Composite". Advanced Materials Research 415-417 (grudzień 2011): 25–29. http://dx.doi.org/10.4028/www.scientific.net/amr.415-417.25.

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In this paper, the growth mechanism of MgO in the as-cast ZnO coated Mg2B2O5 whisker reinforced AZ31B composite. The elements distribution of interfacial vicinity are analyzed by electron probe microanalysis (EPMA) and microstructures of MgO and MgZn2 are observed by transmission electron microscope (TEM). The crystallographic orientation relationship between the Mg2B2O5 and MgO in the ZnO coated Mg2B2O5 whisker reinforced AZ31B composite is investigated to be [010]Mg2B2O5 // [011]MgO and (102)Mg2B2O5//(111 )MgO. The formation of intermetallic phase MgZn2 is discussed.

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