Relevant bibliographies by topics / Nb-Si based alloys

Academic literature on the topic 'Nb-Si based alloys'

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Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Nb-Si based alloys"

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Yang, Jianyong, Guanqun Zhuo, Kaiyong Jiang, Xinghan Zhu, and Linfen Su. "The Oxidation Resistance of Nb-Si-Based Alloys at Intermediate and High Temperatures." Materials 13, no. 5 (March 9, 2020): 1229. http://dx.doi.org/10.3390/ma13051229.

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The oxidation behavior of three Nb-Si-based alloys were evaluated at intermediate (800 °C) and high (1250 °C) temperatures for 100 h in air. At 800 °C, the Nb-24Ti-15Si-13Cr-2Al-2Hf (at. %) alloy suffered from catastrophic pest oxidation. This pest phenomenon was suppressed by the addition of Sn. However, Ta addition protected the Nb-Si-based alloys from pest oxidation for a short time. At 1250 °C, Sn could enhance the oxidation resistance of Nb-Si-based alloys due to the formation of a Sn-rich layer. In addition, the oxidation mechanisms of Nb-Si-based alloys at intermediate and high temperatures were discussed.
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Qu, Shi Yu, Ya Fang Han, and Liguo Song. "Microstructures and Properties of Refractory Niobium-Silicide-Based Composites." Materials Science Forum 475-479 (January 2005): 737–40. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.737.

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The microstructures, mechanical properties and oxidation resistance of the refractory Nb-silicide-based composites have been investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), compression tests and high-temperature oxidation experiments. The results showed that 1773K/100h heat-treatment was an optimum processing for acquiring equilibrium Nb solid solution and silicides microstructure. In the binary Nb-Si system, the microstructure consisted of continuous Nb5Si3 equilibrium matrix and dispersed Nb particles, while in the the Nb-Ti-Cr-Al-Si-(Hf) multicomponent system, there are two typical microstructures, i.e., a two-phase structure of β (Nb solid solution)+D81 Nb5Si3-type silicide in the alloys with the Si+Al content (15at.% and 6at.%, respectively), and a three-phase structure of β+D81 Nb5Si3-type + D88 Ti5Si3-type silicides in the alloys with lower Si+Al content (10at.% and 8at.%, respectively). The results of compression tests showed that all alloys display high strength at both room and high temperatures, only a slight decrease in compression properties occured for Nb-Ti-Cr-Al-Si alloys, comparing to the binary Nb-Si in-situ composites. This type of alloys possesses good high temperature strengths up to at least 1473K. The results of high-temperature oxidation experiments showed that the oxidation rates of the alloys with Ti, Cr, Al and Hf addition were at least one order of magnitude lower than those of the Nb-Si binary alloys.
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Kim, Won Yong. "Microstructure and Pseudoelasticity of Ti-Nb-Si Based Alloys with Biocompatible Alloying Elements." Materials Science Forum 546-549 (May 2007): 2151–56. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.2151.

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We have newly designed a metastable β Ti-Nb-Si based alloy with biocompatible alloying elements without containing toxic V or Al for orthodontic applications. Microstructures and pseudoelastic behavior of β Ti-Nb-Si alloys were investigated in order to correlate the pseudoelasticity and microstructure together with martensite transformation. Nb and Si alloying to the present alloy make β phase to be stable. It is found that metastable β phase is favorable to display pseudoelastic behavior than stable or unstable β phase. Optical microscope (OM) revealed that stress-induced martensitic transformation takes place during room temperature deformation in the present alloys. Within the alloys having β (bcc) phase studied the alloy with low content of Si appeared to exhibit a dominant behavior for stress-induced martensitic transformation than that with high content of Si. After recrystallization heat treatment pseudoelasticity of the present alloy appeared to be prominent. The pseudoelastic behavior of this alloy was correlated to the stress-induced martensite transformation. Pseudoelasticity of the present alloys is hindered by the development of {001}<110> rotated cube component.
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Hagisawa, Takehito, Hirokazu Madarame, Shinji Tanaka, Yasuyuki Kaneno, and Takayuki Takasugi. "High Temperature Compression Properties of Ni3(Si,Ti) Based Intermetallic Compounds." Materials Science Forum 783-786 (May 2014): 1129–35. http://dx.doi.org/10.4028/www.scientific.net/msf.783-786.1129.

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High temperature compression properties of Al-, Cr-or Nb-added Ni3(Si,Ti) based intermetallic compounds were investigated by uni-axial compression test and microstructural observation. The Al-or Cr-added Ni3(Si,Ti) alloys after homogenization heat treatment exhibited a two-phase microstructure consisting of L12and Ni-solid solution phases. The Nb-added Ni3(Si,Ti) alloy after homogenization heat treatment exhibited a triple-phase microstructure consisting of G-phase with D8a structure and Ni-solid solution phase in the L12matrix. The volume fraction of Ni-solid solution phase increased in order of Cr-, Nb-and Al-added Ni3(Si,Ti) alloys. The Cr-added Ni3(Si,Ti) alloy was deformable at high strain rate, while the Nb-added one was deformable at low strain rate. It can be considered that the deformability of Ni3(Si,Ti) at high temperature is closely correlated with volume fraction of Ni-solid solution phase and recrystallization behavior.
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Miura, Seiji, Tatsuichi Tanahashi, Yoshinao Mishima, and Tetsuo Mohri. "Alloy Design of Nb-Si Based High Temperature Alloys by Phase Stability Control." Materials Science Forum 654-656 (June 2010): 444–47. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.444.

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In order to spheroidize -Nb5Si3 strengthening phase embedded in Nb matrix for attaining a good room temperature toughness of Nb-Si alloy, the authors have proposed a microstructure control technique by combining eutectic and eutectoid reactions. Nb3Si intermetallic compound formed during solidification is a key phase for the microstructure control, but its stability is very sensitive to the alloying elements. Nb3Si disappears by adding as small as 3 at% of W and Mo, while these elements are very effective for the solid solution strengthening of Nb phase. For a further alloy development, establishment of an alloy design concept based on the control of phase stability of Nb3Si is needed. Similarly to ferrous alloys such as stainless steels where Cr and Ni are added to control the stability of bcc phase and fcc phase, two alloying elements (one is a stabilizing element and the other is a destabilizing element for Nb3Si phase) are added to a Nb-Si binary master alloy and their microstructure is investigated using SEM. The stabilizing element Ta is found to enlarge the composition area where Nb3Si exists even with the destabilizing element Mo, and it is confirmed that the phase stability concept is useful for designing Nb-Si based alloys.
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Shen, Fuqiang, Yingyi Zhang, Laihao Yu, Tao Fu, Jie Wang, Hong Wang, and Kunkun Cui. "Microstructure and Oxidation Behavior of Nb-Si-Based Alloys for Ultrahigh Temperature Applications: A Comprehensive Review." Coatings 11, no. 11 (November 9, 2021): 1373. http://dx.doi.org/10.3390/coatings11111373.

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Nb-Si-based superalloys are considered as the most promising high-temperature structural material to replace the Ni-based superalloys. Unfortunately, the poor oxidation resistance is still a major obstacle to the application of Nb-Si-based alloys. Alloying is a promising method to overcome this problem. In this work, the effects of Hf, Cr, Zr, B, and V on the oxidation resistance of Nb-Si-based superalloys were discussed. Furthermore, the microstructure, phase composition, and oxidation characteristics of Nb-Si series alloys were analyzed. The oxidation reaction and failure mechanism of Nb-Si-based alloys were summarized. The significance of this work is to provide some references for further research on high-temperature niobium alloys.
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Ghadyani, Mohammad, Claire Utton, and Panos Tsakiropoulos. "Microstructures and Isothermal Oxidation of the Alumina Scale Forming Nb1.45Si2.7Ti2.25Al3.25Hf0.35 and Nb1.35Si2.3Ti2.3Al3.7Hf0.35 Alloys." Materials 12, no. 5 (March 5, 2019): 759. http://dx.doi.org/10.3390/ma12050759.

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Coating system(s) will be required for Nb-silicide based alloys. Alumina forming alloys that are chemically compatible with the Nb-silicide based alloy substrate could be components of such systems. The intermetallic alloys Nb1.45Si2.7Ti2.25Al3.25Hf0.35 (MG5) and Nb1.35Si2.3Ti2.3Al3.7Hf0.35 (MG6) were studied in the cast, heat treated and isothermally oxidised conditions at 800 and 1200 °C to find out if they are αAl2O3 scale formers. A (Al/Si)alloy versus Nb/(Ti + Hf)alloy map, which can be considered to be a map for Multi-Principle Element or Complex Concentrated Nb-Ti-Si-Al-Hf alloys, and a [Nb/(Ti + Hf)]Nb5Si3 versus [Nb/(Ti + Hf)]alloy map were constructed making use of the alloy design methodology NICE and data from a previously studied alloy, and were used to select the alloys MG5 and MG6 that were expected (i) not to pest, (ii) to form αAl2O3 scale at 1200 °C, (iii) to have no solid solution, (iv) to form only hexagonal Nb5Si3 and (v) to have microstructures consisting of hexagonal Nb5Si3, Ti5Si3, Ti5Si4, TiSi silicides, and tri-aluminides and Al rich TiAl. Both alloys met the requirements (i) to (v). The alumina scale was able to self-heal at 1200 °C. Liquation in the alloy MG6 at 1200 °C was linked with the formation of a eutectic like structure and the TiAl aluminide in the cast alloy. Key to the oxidation of the alloys was the formation (i) of “composite” silicide grains in which the Nb5Si3 core was surrounded by the Ti5Si4 and TiSi silicides, and (ii) of tri-aluminides with high Al/Si ratio, particularly at 1200 °C and very low Nb/Ti ratio forming in-between the “composite” silicide grains. Both alloys met the “standard definition” of high entropy alloys (HEAs). Compared with HEAs with bcc solid solution and intermetallics, the VEC values of both the alloys were outside the range of reported values. The parameters VEC,  and  of Nb-Ti-Si-Al-Hf coating alloys and non-pesting Nb-silicide based alloys were compared and trends were established. Selection of coating alloys with possible “layered” structures was discussed and alloy compositions were proposed.
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Wang, Q., C. L. Zhu, Y. H. Li, X. Cheng, W. R. Chen, J. Wu, J. B. Qiang, Y. M. Wang, and C. Dong. "Co- and Fe-based multicomponent bulk metallic glasses designed by cluster line and minor alloying." Journal of Materials Research 23, no. 6 (June 2008): 1543–50. http://dx.doi.org/10.1557/jmr.2008.0210.

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Bulk metallic glass (BMG) formations in Co- and Fe-based alloy systems are investigated by using our cluster line approach in combination with minor alloying principle. Basic ternary alloy compositions in Co–B–Si, Fe–B–Y, and Fe–B–Si systems are first determined by cluster lines defined by linking special binary clusters to third elements. Then the basic ternary alloys are further minor alloyed with 3 to 5 at.% Nb to improve glass-forming abilities (GFAs) and ϕ3 mm BMGs are formed in (Co8B3–Si)–Nb and (Fe8B3–Y)–Nb but not in (Fe8B3–Si)–Nb, TM8B3 (TM = Fe, Co) being the most compact binary cluster. The BMGs are expressed approximately with a unified simple composition formula: (TM8B3)1M1, M = (Si, Nb) or (Y, Nb). Finally, mutual Fe and Co substitutions further improve the GFAs as well as the soft magnetic properties, e.g., Is reaching 0.98 T and Hc < 6 A/m for the Co–Fe–B–Si–Nb BMGs. Using the (cluster)1(glue atom)1 model, a new ternary BMG Fe8B3Nb1 is obtained.
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Wang, Jin San, Yong Wang Kang, and Chang Rong Li. "Phase Diagram and Phase Equilibrium Studies on Ultra High Temperature Alloys of Nb-Si-Ti." Materials Science Forum 849 (March 2016): 618–25. http://dx.doi.org/10.4028/www.scientific.net/msf.849.618.

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Due to their high melting temperatures, low densities and excellent high-temperature strengths, Nb-Si-Ti-based ultra high temperature alloys shows great potential for vane materials on the next generation of high thrust-weight ratio aero-engines. In the present paper, the Nb-Si-Ti ternary system was studied, the phase diagram of Nb-Si-Ti and the phase fraction calculated, and the curve of solidification process established. The calculated results provide primary guidance for developing Nb-Si-Ti-X ultrahigh temperature alloys. Moreover, it is very useful as a guide for alloy design and processing development.
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Goto, Daisuke, Ken-ichi Ikeda, and Seiji Miura. "Phase equilibrium and mechanical properties of Cr-Mo-Nb-Si-B alloys Composed of BCC and T2-silicide phase." MRS Advances 4, no. 25-26 (2019): 1491–96. http://dx.doi.org/10.1557/adv.2019.110.

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ABSTRACTA new class of high-temperature materials based on refractory elements was investigated with an aim to improve the energy efficiency of thermal power plants. Alloys based on Nb and Mo composed of BCC solid solution (BCCss) (Nb-Mo) and T2-silicide (Nb,Mo)5(Si,B)3 are promising candidates as high-temperature materials. Further investigation on the alloy phase equilibria of this system is required to improve the mechanical properties and oxidation resistance through optimization of the phase compositions. Cr is one candidate to modify the properties of the alloy because Cr is expected to stabilize the T2 compound phase along with B. Here, the phase equilibria among BCCss and the T2 compound are widely investigated in the Cr-Mo-Nb-Si-B system, and a BCCss-T2 two-phase microstructure is found in Mo-rich alloys. The B/Si ratio in the T2 phase increases with the Cr content, while almost no B solubility was found in BCCss. As the Si content increases in alloys, the A15 silicide phase ((Cr, Mo, Nb)3Si) and/or Laves phase appear.Nanoindentation tests were conducted to investigate the mechanical properties of the BCCss phase of the alloys in the Cr-Mo-Nb-Si-B system. The nanohardness and reduced elastic modulus of these alloys tended to be higher with an increase in Cr.
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Dissertations / Theses on the topic "Nb-Si based alloys"

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Dehoff, Ryan R. "Microstructure, Oxidation Behavior And Mechanical Behavior Of Lens Deposited Nb-Ti-Si And Nb-Ti-Si Based Alloys." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1221839511.

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Xu, Mengyao. "Oxidation Behavior of Nb-Si-Ti-Cr-Al-X Based Multi-Component Alloys." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1155821250.

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COELHO, RODRIGO E. "Obtencao das ligas Al-Fe-X-Si (X = V ou Nb) por moagem de alta energia e extrusao a quente." reponame:Repositório Institucional do IPEN, 2001. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10870.

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Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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Lin, Song-En, and 林頌恩. "Effects of the Additions of Si and Al on Enhancing High-Temperature Oxidation Resistance of Ti-, Nb-, and Mo-based Alloys." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/59075691379715584846.

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碩士
國立臺灣海洋大學
材料工程研究所
99
The oxidation behabior of binary Ti-Si, Nb-Si, and Mo-Si alloys was studied over the temperature range of 700~ 1000℃ in dry air. In addition, the effect of Al addition on high temperature oxidation resistance of those alloys was also studied for comparative purpose. The results showed that the oxidation kinetics of three Ti-Si alloys at 800~1000℃ followed the parabolic-rate law, with their oxidation rates gradually increasing with temperature. This further indicates that diffusion is the rate-determining step during oxidation. It was also found that the higher the Si content the better the oxidation resistance. In addition, the scales formed on the (TiSi2)91Al9 consisted mostly of α-Al2O3, whose formation is responsible for the further improvement of oxidation resistance. The oxidation kinetics of the Nb-20Si alloy followed a multiple-stage parabolic-rate law at 700~800℃, while no-mass-gain kinetics were observed at 900-1000℃. In addition, the oxidation kinetics of the (Nb-20Si)90Al10 alloy also followed parabolic-rate law at 700~1000℃. The scales formed on the two alloys consisted of fragile, powder-like Nb2O5 structures, implying that the addition of Al can not effectively prevent the pesting phenomenon for the ternary alloy. The scales forms on MoSi2 were composed of volatile spieces of MoO3 during oxidation indicating that the pesting behavior was evident for the MoSi2 alloy. On the other hands, the oxidation kinetics of the (MoSi2)95Al5 ternary alloy followed the parabolic-rate law, indicating that the volatilization of MoO3 was significantly retarded. Based on microstructural analyses, the scales formed on the (MoSi2)95Al5 surface consisted mostly of α-Al2O3, whose formation is also responsible for the improvement of the oxidation resistance for the ternary alloy.
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Pin, Jang Shin, and 鄭世彬. "A Study on the Microsturcture Evolution and Environmental Embrittlement of the Ni-Si-Nb Based Intermetallic Alloys Doped with Boron and Chromium." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/54184967620851107936.

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碩士
義守大學
材料科學與工程學系
90
Abstract Intermetallic compounds based on Ni3Si (ordered fcc L12 structure) offer a number of interesting properties for structural applications in aggressive environments at elevated temperature. These interesting properties include the excellent corrosion and oxidation resistance at both ambient and elevated temperatures, good specific strength in comparison with other materials, increasing yield strength as a function of temperature, and a peak yield strength occurring at about 700℃. However, similar to the Ni3Al, binary Ni3Si suffers from grain boundary embrittlement at room temperature. Therefore, how to improve its grain boundary adhesion will be the critical point of increasing the ductility and widespread the applications of Ni-Si intermetallic alloys. According to the pre-studies, we select the Ni-19Si-3Nb alloy as the based alloy to investigate the effect of adding boron and Chromium by means of arc melting and drop casting under argon atmospheres, and then homogenizing and aging in a vacuum annealing furnace with atmosphere of 5×10-5 torr at 1080℃ for 4 hours and 700℃ for 10 hours respectively. The main part of heat-treated ingots were machined into the tensile test specimen with the gauge dimension of 3mmx2mmx20mm..Then the specimen were tensile test under different atmosphere, [such as air (14000ppm H2O vapor), vacuum(2×10-4torr),and pure water vapor(850ppm)] at different temperature(25℃、500℃、600℃、700℃、800℃). The evolution of microstructure change and mechanical properties of the Ni-19Si-3Nb-0.15B-XCr alloys were characterized by x-ray diffraction, SEM, TEM, EPMA, microhardness test, Vickers hardness test, and tensile tests. According to the result of this study. The optimum condition of the mechanical properties occurs at the composition of Ni-18Si-3Nb-0.15B-1.0Cr. It can improve elongation on high temperature due to add Cr. The elongation reaches 23﹪for the specimen tested under the vacuum at 800℃ temperature. This reason that with Cr additions the hydrogen atoms were adsorption on the alloy surface increased the possibility of adsorption of hydrogen species onto the surface. Furthermore it can form a chromium oxide layer to enhance corrosion and oxidation resistance. The results of this study showed that with Cr addition can improves ductility and suppress environment embitterment on high temperatures.
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DuPont, John N. "Solidification and welding metallurgy of experimental Ni base and Fe base superalloys containing Nb, Si, and C /." Diss., 1997. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:9734875.

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LI, TAI-MEI, and 李岱玫. "Mechanical Properties and Microstructural Evolution of Nb-Ti-Si Based Intermetallic Alloy with Hf and Mo elements." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/n72cjg.

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碩士
國立高雄科技大學
機械工程系
107
In this thesis, it is investigated the mechanical properties and microstructural evolution of Nb-Si-Ti based intermetallic alloy with different content of Hf and Mo elements. First, Nb3Si and Nb5Si3 intermetallic alloy are analyzed by an X-ray diffractometer to confirm the structure. Using the universal material testing machine and the split Hopkinson pressure bar (SHPB) to exam the quasi-static and dynamic mechanical properties of these alloys. The strain rate experiments of Nb-Si-Ti alloy with different strain rates ranging from 10-3 to104 s-1 are investigated. The experiment result show the plastic flow stress value and the strain rate sensitivity subsequently increases. Furthermore, the strength and ductility are improved by Hf or Mo element adding. With 2%Mo addtion , the Nb-Si-Ti based intermetallic alloy has the excellent mechanical properties. The microstructural evolution was observed by OM and SEM. The materials are layered and had a large Nbss phase and fine Nbss+Nb5Si3 eutectic structure. The fracture morphology show that, Nb-Si-Ti based alloys were all intergranular fracture. Typical river shapes could be seen on the surface, and many micro-cracks appeared on it.
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Book chapters on the topic "Nb-Si based alloys"

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Kim, Won Yong. "Microstructure and Pseudoelasticity of Ti-Nb-Si Based Alloys with Biocompatible Alloying Elements." In Materials Science Forum, 2151–56. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-432-4.2151.

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Kim, Han Sol, and Won Yong Kim. "Mechanical Property and Elastic Modulus of Metastable Ti-Nb Based Alloys with Si Addition." In Materials Science Forum, 1427–30. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-432-4.1427.

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Li, Xiao Xia, and Chun Gen Zhou. "Development and Oxidation Resistance of Si-Modifide MCrAlY Coatings on Nb-Base Alloy." In Materials Science Forum, 1721–24. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-432-4.1721.

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Wang, Qing, Chun Lei Zhu, Yan Hui Li, Jiang Wu, Chuang Dong, Jian Bing Qiang, Wei Zhang, and Akihisa Inoue. "Cluster-Based Bulk Metallic Glass Formation in Co (-Fe)-Si-B-Nb Alloy Systems." In Materials Science Forum, 1275–78. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-462-6.1275.

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Kim, Won Yong, Han Sol Kim, Shae K. Kim, Tae Yeub Ra, and Mok Soon Kim. "Effect of Ternary Alloying Elements on Microstructure and Mechanical Property of Nb-Si Based Refractory Intermetallic Alloy." In Materials Science Forum, 342–45. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-966-0.342.

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Conference papers on the topic "Nb-Si based alloys"

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Li, Y. L., C. L. Ma, and H. Zhang. "Crystallographic Orientation Evolution in NbSS-Nb5Si3 Eutectic Alloys by EBSD Analyses." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-95309.

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The progresses in high temperature materials encourage the development of turbine engine in terms of thrust and efficiency. Ni-based superalloys, which are predominant in elevated temperature application, have limited potential to raise serving temperature. In-situ composites, such as Cr-Cr3Si, NiAl-Cr and Nb-Nb5Si3 eutectic alloys, consisting of a ductile metallic phase and a hard intermetallic phase, are attractive candidates to replace Ni-based superalloys. The microstructure and mechanical properties of these in-situ composites are widely investigated. However, little work is focused on crystallography of in-situ composites, except for preferred growth direction and crystallographic orientation relationship. In this paper, Nb-Si-Mo-based alloys were fabricated by non-consumable arc melting, and then were directionally solidified in an optical floating zone (OFZ) melting furnace. The crystallographic orientation evolutions in Nb-Nb5Si3 eutectic alloy are studied by electron back-scattered diffraction (EBSD) analyses. First, the effect of solidification condition on crystallographic orientation is examined. The as-cast alloy displays cellular microstructure. The Nb phase shows different crystallographic orientations in different cells, while the Nb5Si3 phase shows similar crystallographic orientation in a number of cells. In directionally solidified alloys, when growth rate is 5mm/h without seed rod rotation, the grain sizes of Nb and Nb5Si3 are both several millimeter. As growth rate rises or seed rod rotates, the grain size of Nb decreases much more drastically than that of Nb5Si3. Thus, solidification condition is supposed to influence nucleation of the Nb phase rather than the Nb5Si3 phase. Second, the effect of annealing on crystallographic orientation is studied. The Nb5Si3 has three allotropic phases. The allotropic phase transformations occur through annealing, during which the Nb5Si3 grain size decreases.
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Fenineche, N. E., M. Cherigui, A. Kellou, H. Aourag, and C. Coddet. "Structure and Magnetic Properties of Iron-Based Alloys Obtained by APS Thermal Spraying." In ITSC2003, edited by Basil R. Marple and Christian Moreau. ASM International, 2003. http://dx.doi.org/10.31399/asm.cp.itsc2003p1409.

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Abstract The development of amorphous and nanocrystalline materials took a significant part in search on materials these last years. Indeed, the magnetic, chemical and mechanic properties of materials are greatly modified when the size of crystallites becomes nanometric. The absence of crystal structure involves a macroscopic behaviour of the alloy, which is completely different from the same alloy in a polycrystalline state, particularly magnetic and mechanical properties. We have carried out coatings by APS plasma thermal spraying on a copper substrate using three types of powders, FeB (17,5% wt-B), FeSi (6,5% wt-Si) and FeNb (67,2% wt-Nb). Structure of these coatings was characterized by SEM and X-rays. We have also tested the magnetic properties of these deposits. Results obtained showed that the FeNb alloys are amagnetic with a partially amorphous structure, however FeSi and FeB alloys presented a microcrystalline structure with soft magnetic properties.
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Borisov, Y., V. Korzhyk, and S. Revo. "Electric and Magnetic Properties of Thermal Spray Coatings with an Amorphous Structure." In ITSC 1998, edited by Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p0687.

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Abstract Physical properties of coatings based on Fe-B, Fe-Ni-B, Fe-Cr-P-C, Fe-Ni-Si-B, Ni-P, Ni-Nb and Co-Fe-B-Si, deposited by the methods of flame, plasma-arc, and detonation spraying were investigated. The coatings have mostly the amorphous structure with the volume content of the amorphous phase equal to 75-95 %. Values of the distribution and temperature coefficients of electric resistance of the coatings, depending upon a method and conditions of spraying, as well as upon their treatment parameters, were determined. Comparative studies of these coatings and thin amorphous strips produced by the melt spinning method were conducted. The amorphous coatings of ferromagnetic iron and cobalt alloys are shown to be magnetically soft materials and are characterized by a high magnetic induction combined with a high magnetic permeability. As compared with the amorphous strips, Curie temperature of the amorphous ferromagnetic coatings is by 50-140 K higher and their anisotropy of magnetic properties is lower.
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4

Zeng, Zhensu, Yukinobu Makino, Sayaka Sako, Hidenori Era, Ken Muraoka, and Seiji Kuroda. "Development of Super Stainless Steel Coating with Improved Corrosion Resistance and Enhanced Hardness Focusing on Characteristics of Atmosphere Plasma Spray Process." In ITSC2019, edited by F. Azarmi, K. Balani, H. Koivuluoto, Y. Lau, H. Li, K. Shinoda, F. Toma, J. Veilleux, and C. Widener. ASM International, 2019. http://dx.doi.org/10.31399/asm.cp.itsc2019p0867.

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Abstract This study assesses the effect of different alloying elements on the microstructure, oxygen content, hardness, and corrosion resistance of stainless steel coatings produced by atmospheric plasma spraying. SUS836L stainless steel powder with Si, Mn, and B additions served as the base feedstock alloy to which different amounts of B, C, Mo, Ti, Nb, V, and Cu were added. The powder mixtures were sprayed on carbon steel substrates and the deposits were examined and tested. The results show that B and C additions of 2-3% have a beneficial effect, but at 5% cause a drop in corrosion resistance that proved to be remediable through the addition of Cu, which improves the corrosion potential of the matrix phase by its combined action with Mo, Si, and B. The effect of Ti, Nb, and V, which are added to suppress Cr oxidation in molten alloy particles during flight, is that it promotes that formation of fine carbide and boride compounds, increasing hardness without sacrificing corrosion resistance. In addition to these findings, the study also shows that the coatings developed are in many ways comparable to Ni-based self-fluxing alloy coatings.
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Nandha Kumar, E., K. S. Athira, Subhradeep Chatterjee, and Dheepa Srinivasan. "Effect of Heat Treatment on Structure and Properties of Laser Powder Bed Fusion Inconel 939." In 2022 International Additive Manufacturing Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/iam2022-93945.

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Abstract Additive manufacturing of high gamma prime (γ’) Nickel-based superalloys are challenging due to their hot cracking tendency. This study comprises an understanding of microstructural evolution and mechanical properties of Inconel 939 (IN939) alloy processed via laser powder bed fusion (LPBF). The as-printed samples comprised of columnar grains along the build direction with a pronounced &lt;100&gt; texture resulting in ∼17% lower elastic modulus along the build direction as compared to the builds in transverse orientation. The microstructure consists of cellular and columnar dendrites with segregation of Nb, Ta and Si in the inter-dendritic regions (decorating the cell boundaries). Occurrence of fine (&lt; 50 nm) intra granular carbides in the as printed condition is a unique feature of this microstructure. Heat treatment resulted in dissolution of the dendritic microstructure with precipitation of semi-coherent γ’ (Ni3(Al,Ti)) precipitates (150–200 nm) homogeneously from the matrix resulting in ∼16% enhanced yield strength. The &lt;100&gt; texture is retained even after the solution and aging heat treatment indicating thermal stability of this structure.
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Reports on the topic "Nb-Si based alloys"

1

Ouyang, Lizhi. COMPUTATIONAL STUDIES OF PHYSICAL PROPERTIES OF Nb-Si BASED ALLOYS. Office of Scientific and Technical Information (OSTI), December 2013. http://dx.doi.org/10.2172/1337019.

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Allen, Jeffrey, Robert Moser, Zackery McClelland, Md Mohaiminul Islam, and Ling Liu. Phase-field modeling of nonequilibrium solidification processes in additive manufacturing. Engineer Research and Development Center (U.S.), December 2021. http://dx.doi.org/10.21079/11681/42605.

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This project models dendrite growth during nonequilibrium solidification of binary alloys using the phase-field method (PFM). Understanding the dendrite formation processes is important because the microstructural features directly influence mechanical properties of the produced parts. An improved understanding of dendrite formation may inform design protocols to achieve optimized process parameters for controlled microstructures and enhanced properties of materials. To this end, this work implements a phase-field model to simulate directional solidification of binary alloys. For applications involving strong nonequilibrium effects, a modified antitrapping current model is incorporated to help eject solute into the liquid phase based on experimentally calibrated, velocity-dependent partitioning coefficient. Investigated allow systems include SCN, Si-As, and Ni-Nb. The SCN alloy is chosen to verify the computational method, and the other two are selected for a parametric study due to their different diffusion properties. The modified antitrapping current model is compared with the classical model in terms of predicted dendrite profiles, tip undercooling, and tip velocity. Solidification parameters—the cooling rate and the strength of anisotropy—are studied to reveal their influences on dendrite growth. Computational results demonstrate effectiveness of the PFM and the modified antitrapping current model in simulating rapid solidification with strong nonequilibrium at the interface.
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