Готові списки джерел за темами / Mg-Li based alloys

Добірка наукової літератури з теми "Mg-Li based alloys"

Автор: Grafiati

Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Mg-Li based alloys"

Sikdar, Koushik, Shashank Shekhar, and Kantesh Balani. "Fretting wear of Mg–Li–Al based alloys." Wear 318, no. 1-2 (October 2014): 177–87. http://dx.doi.org/10.1016/j.wear.2014.06.012.

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Jun, Joong Hwan, Ki Duk Seong, Jeong Min Kim, Ki Tae Kim, and Woon Jae Jung. "Influence of Microstructural Change on Damping Capacity of Mg-X%Li Alloys." Materials Science Forum 539-543 (March 2007): 1764–68. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.1764.

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Анотація:

The Effects of Li content and annealing treatment on microstructure and damping capacity for Mg-X%Li alloys have been investigated, based on experimental results from X-ray diffractometry (XRD), optical microscopy (OM), hardness tests and vibration damping tests in a flexural mode. The Mg-X%Li alloys containing Li of 3%, 8% and 13% consist of α (HCP) single phase, (α + β (BCC)) dual phases and β single phase, respectively. In as-rolled state, the damping capacity for Mg-Li alloys shows a similar level regardless of Li content. The annealing treatments at 200oC and 400οC give rise to an enhancement of damping capacity only for the Mg-3%Li and Mg-8%Li alloys containing α phase, and at the same annealing temperature, the Mg-3%Li alloy with fully α structure exhibits higher damping capacity. This result indicates that the damping capacity of Mg-Li alloys depends principally on α phase, and that the annealing treatment is necessary to improve its damping capacity.

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Król, Mariusz. "Solidification Characteristics of Mg-Li-Al Alloys." Solid State Phenomena 275 (June 2018): 41–52. http://dx.doi.org/10.4028/www.scientific.net/ssp.275.41.

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The six Mg-Li and Mg-Li-Al alloys in as-cast state namely Mg-4.5%Li, Mg-9%Li, Mg-12%Li, Mg-4.5%Li-1.5%Al, Mg-9%Li-1.5%Al and Mg-12%Li-1.5%Al were prepared and analysed. These alloys have been subjected to the thermal analysis (thermal derivative-analysis and dilatometry study), and the subsequent thermal assessment, mechanical properties and microstructures were studied. The heating and cooling dilatometric curves characterise by a linear reduction (alloys with 12wt.% of Li) and linear increase (alloys with 4.5wt.% of Li) in coefficient of linear thermal expansion as a function of temperature. No transitions in the solid state occur. Based on results of thermal derivative analysis a crystallisation process of Mg-Li and Mg-Li-Al alloys was proposed. Addition of aluminium in ultra-light Mg-Li alloys shows considerably improved strengthening without a reduction in grain size. Increasing the lithium content causes in an increase of hardness.

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Okafor, Chiamaka, and Norman Munroe. "The Promise of Mg-Li Based Alloys for Biomedical Implant Materials." Materials Science Forum 1085 (April 20, 2023): 139–48. http://dx.doi.org/10.4028/p-55j9e9.

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Lithium is an attractive element for Mg alloys for several reasons. It can improve room temperature ductility by transforming the single-phase hcp microstructure of Mg to a duplex phase followed by a single-phase bcc structure. With a solubility of ~5 wt.% Li, α-Mg is less prone to localized corrosion due to the absence of intermetallics. Furthermore, the strength of Mg-Li based alloys can be enhanced by alloying and thermomechanical processing. However, grain refinement has proven to be an effective mechanism in offsetting a compromise in ductility. It is for these reasons that Mg-Li based alloys have been the focus of great interest as a biomaterial where high strength, appreciable ductility and uniform corrosion behavior are required.

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Kumar, Vinod, Govind, Kempe Philippe, Rajiv Shekhar, and Kantesh Balani. "Processing and Nano-mechanical Characterization of Mg-Li-Al based Alloys." Procedia Materials Science 5 (2014): 585–91. http://dx.doi.org/10.1016/j.mspro.2014.07.303.

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Cao, Dianxue, Xue Cao, Guiling Wang, Lin Wu, and Zhanshuang Li. "Electrochemical discharge performance of Mg-Li based alloys in NaCl solution." Journal of Solid State Electrochemistry 14, no. 5 (June 2, 2009): 851–55. http://dx.doi.org/10.1007/s10008-009-0865-7.

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Muga, C. O., and Z. W. Zhang. "Strengthening Mechanisms of Magnesium-Lithium Based Alloys and Composites." Advances in Materials Science and Engineering 2016 (2016): 1–11. http://dx.doi.org/10.1155/2016/1078187.

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Анотація:

Mg-Li based alloys are widely applied in various engineering applications. The strength of these alloys is modified and enhanced by different strengthening mechanisms. The strengthening mechanisms of these alloys and their composites have been extensively studied during the past decades. Important mechanisms applied to strengthening the alloys include precipitation strengthening, solution strengthening, grain and subgrain strengthening, and dislocation density strengthening. Precipitation and solution strengthening mechanisms are strongly dependent on composition of the alloys and thermal treatment processes, whereas grain and subgrain and dislocation density strengthening mechanisms majorly depend on thermomechanical processing. In this paper, recent studies on conventional processes for the strengthening of Mg-Li based alloys are summarized as they are critical during the alloys design and processing. Main strengthening mechanisms are objectively reviewed, focusing on their advantages and drawbacks. These can contribute to enhancing, initiating, and improving future researches for alloys design and suitable processing selection.

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Yoo, Hyo-Sang, Yong-Ho Kim, and Hyeon-Taek Son. "Effect of Li on Mechanical Properties and Electrical Conductivity of the Al–Zn–Cu–Mg Based Alloys." Journal of Nanoscience and Nanotechnology 21, no. 9 (September 1, 2021): 4897–901. http://dx.doi.org/10.1166/jnn.2021.19268.

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In this study, changes in the microstructure, mechanical properties, and electrical conductivity of cast and extruded Al–Zn–Cu–Mg based alloys with the addition of Li (0, 0.5 and 1.0 wt.%) were investigated. The Al–Zn–Cu–Mg–xLi alloys were cast and homogenized at 570 °C for 4 hours. The billets were hot extruded into rod that were 12 mm in diameter with a reduction ratio of 38:1 at 550 °C. As the amount of Li added increased from 0 to 1.0 wt.%, the average grain size of the extruded Al alloy increased from 259.2 to 383.0 µm, and the high-angle grain boundaries (HGBs) fraction decreased from 64.0 to 52.1%. As the Li content increased from 0 to 1.0 wt.%, the elongation was not significantly different from 27.8 to 27.4% and the ultimate tensile strength (UTS) was improved from 146.7 to 160.6 MPa. As Li was added, spherical particles bonded to each other, forming an irregular particles. It is thought that these irregular particles contribute to the strength improvement.

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Jiang, D. M., and B. D. Hong. "Deformation and fracture behavior of an Al-Li-Cu-Mg-Zr alloy 8090." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 4 (August 1990): 974–75. http://dx.doi.org/10.1017/s0424820100178008.

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Aluminum-lithium alloys have been recently got strong interests especially in the aircraft industry. Compared to conventional high strength aluminum alloys of the 2000 or 7000 series it is anticipated that these alloys offer a 10% increase in the stiffness and a 10% decrease in density, thus making them rather competitive to new up-coming non-metallic materials like carbon fiber reinforced composites.The object of the present paper is to evaluate the inluence of various microstructural features on the monotonic and cyclic deformation and fracture behaviors of Al-Li based alloy. The material used was 8090 alloy. After solution treated and waster quenched, the alloy was underaged (190°Clh), peak-aged (190°C24h) and overaged (150°C4h+230°C16h). The alloy in different aging condition was tensile and fatigue tested, the resultant fractures were observed in SEM. The deformation behavior was studied in TEM.

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Klobes, Benedikt, Danny Petschke, Frank Lotter, Vasily Potapkin, and Torsten E. M. Staab. "The Li stance on precipitation in Al–Li-based alloys: an investigation by X-ray Raman spectroscopy." Journal of Materials Science 57, no. 11 (March 2022): 6157–66. http://dx.doi.org/10.1007/s10853-022-07018-w.

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AbstractDecomposition and precipitation processes in a binary Al–Li alloy and a technical Al–Li–Cu–Mg alloy were investigated using differential scanning calorimetry and X-ray Raman spectroscopy (XRS). The formation of $$\delta $$ δ ’ and T1 precipitates in the Al–Li and the T8 heat-treated Al–Li–Cu–Mg alloy, respectively, was confirmed using DSC. The XRS measurements complemented by simulated spectra allowed for probing specifically Li and its environment within the Al matrix. Based on linear combination fits of the XRS spectra, the relative contributions of $$\delta '$$ δ ′ and T1 precipitates were quantified. These results are in agreement with estimates of the relative amount of Li taking part in the precipitation process. Difficulties and limitations of the application of XRS to Al alloy systems are also discussed.

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Більше джерел

Дисертації з теми "Mg-Li based alloys"

Phasha, Maje Jacob. "Ab initio study of cohesive, electronic and elastic properties of ordered cubic-based Mg-Li alloys." Thesis, University of Limpopo (Turfloop Campus), 2005. http://hdl.handle.net/10386/890.

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Thesis (M.Sc. (Physics)) --University of Limpopo, 2005
Self-consistent electronic structure calculations have been performed on ordered cubic-based magnesium-lithium (Mgx-Li1−x) alloys spanning the concentration range 0 ≤ x ≤ 1, using an ab initio plane wave pseudopotential (PWP) method. The first principle pseudopotential planewave approach is used within the local density approximation (LDA) and generalized-gradient approximation (GGA)of the density functional theory (DFT) framework. We have calculated the binding energy curves and the systematic trends in various cohesive and elastic properties at zero temperature, as a function of Li concentration. The calculated equilibrium lattice parameters show a large deviation from Vegard’s rule in the Li-rich region whilst the bulk moduli decrease monotonically with increase in Li concentration. The heats of formation for different ground state superstructures predict that the DO3, B2 and DO22 structures would be the most stable at absolute zero amongst various phases having the Mg3Li, MgLi and MgLi3 compositions, respectively. This stability is reflected in the electronic density of states (DOS). Because of the special significance of the isotropic bulk modulus, shear modulus, Young’s modulus and Poisson’s ratio for technological and engineering applications, we have also calculated these quantities from the elastic constants. The elastic constants indicate the softness of the material as more Li is added with the bcc-based phases becoming mechanically less stable for Li concentration less than 50%. Our results show good agreement within the estimated uncertainty with both experimental and previous theoretical results.
The National Research Foundation (NRF), South Africa-Royal Society (RS), Great Britain collaboration and Council for the Scientific and Industrial Research (CSIR)

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Barlow, Ian Christopher. "Evolution of microstructure and thermal stability of Al-Ti-O and Al-Li-Mg based materials." Thesis, University of Sheffield, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369967.

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Chandra, Shekhar P. "Development of wrought Mg-Li based alloys with improved strength and ductility." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5358.

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A comprehensive investigation has been undertaken to develop cold rolled Mg-Li based alloys with tensile properties superior to the existing commercial or experimental Mg-Li based alloys. In this endeavor, melting and casting of these alloys proved to be very challenging. In the present work, the challenges encountered in melting and casting of these alloys and efforts to successfully overcome them to produce good quality castings, which could be easily cold rolled to achieve tensile properties hitherto not achieved for Mg-Li based alloys are discussed. Overall, it can be said that the squeeze cast LZ82 alloy exhibited superior tensile properties compared to LZ81 alloy for all the processing routes investigated in the present work. The best tensile properties were obtained for 85% cold rolled LZ82 alloy, i.e., 219 MPa 0.2% proof stress, 262 MPa ultimate tensile strength and 64% elongation to failure, which are superior to any commercial or experimental Mg-Li based alloy

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Частини книг з теми "Mg-Li based alloys"

Muga, C. O., Y. Zhao, H. Guo, S. Xu, Y. Zou, and Z. W. Zhang. "Addition of Holmium and Erbium and Hot-Rolling Effects on the Microstructure and Mechanical Properties of Mg–Li Based Alloys." In The Minerals, Metals & Materials Series, 463–70. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-52392-7_63.

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Zheng, Yufeng. "Mg-Li-Based Alloy Systems for Biomedical Applications." In Magnesium Alloys as Degradable Biomaterials, 285–310. CRC Press, 2015. http://dx.doi.org/10.1201/b18932-10.

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Ewa Śliwa, Romana. "Metal Forming of Magnesium Alloys for Various Applications." In Magnesium Alloys Structure and Properties. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.101034.

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Анотація:

The chapter presents an analysis of selected magnesium alloys as structural materials to be used in production of parts as well as their technological parameters in some manufacturing processes: metal forming and joining. Taking into account the analysis of microstructure and mechanical properties of conventional and new magnesium alloys and requirements of their possible applications (aviation, automotive, sport, etc.), the study of forming parts/products based on description of plastic formability of magnesium alloys in the processes of bulk metal forming (forging, extrusion, KOBO extrusion, rolling) and joining (friction stir welding) has been presented. Upsetting test, backward extrusion, and KOBO extrusion of complex cross-sectional profiles and forging process were conducted using magnesium alloys such as AZ31, AZ61, AZ80, WE 43, and Mg alloy with Li for the production of thin-walled profiles and forged parts. The range of temperatures and extrusion rate for manufacturing of these profiles were determined. Tests also covered the analysis of microstructure of Mg alloys in the initial state as well as after the extrusion process. The recommendations for realization of metal forming and joining processes of selected magnesium alloys have been presented.

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