掺杂方式对钼合金组织与力学性能影响的研究进展

doi:10.11896/cldb.18120082

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Abstract Silver-white metal molybdenum having high melting point, high strength, low creep rate, small expansion coefficient, excellent thermal conductivity and thermal shock resistance, and strong anti-wear and anti-corrosion properties, widely used in chemical industry, petroleum industry, metallurgical industry, aerospace industry and nuclear energy technology. Pure molybdenum is poorly plastic at room temperature, and it tends to produce grain boundary sliding at high temperatures, resulting in large deformation. The mechanical properties of pure molybdenum at high temperatures are greatly attenuated compared with those at room temperature, and pure molybdenum tends to produce large creep at high temperatures and the strength and hardness decrease significantly. These properties limit the extensive use of pure molybdenum as a structural material. In order to improve the application range of molybdenum metal and improve the strength and toughness of molybdenum metal in various use scenarios, a small amount of alloying elements are usually added to the molybdenum metal. The grain boundary embrittlement phase is removed by solid solution strengthening and dispersion strengthening of trace elements, and the molybdenum alloy can be strengthened as a reac-tant of the dispersed phase to improve the performance. The molybdenum alloys that have been developed under the joint exploration of scholars at home and abroad include Mo-Al₂O₃, Mo-La, TZM, TZC, etc.
The common preparation method of molybdenum alloy is powder metallurgy method. Doping is the first step in the preparation process of molybdenum alloy. The selection of different kinds of doping methods will have different effects on the microstructure and properties of subsequent molybdenum alloy products. There are three commonly used doping methods in the preparation of molybdenum alloys by powder metallurgy: (1) a solid-solid (S-S) doping method in which molybdenum powder is mixed with alloy element powder; (2) a solid-liquid (S-L) doping method in which alloying element is dissolved and mixed into molybdenum (or molybdenum oxide) powder, and dried to be reduced; (3) a liquid-liquid (L-L) doping method for preparing a molybdenum alloy by drying and reducing a compound solution of molybdenum and alloying element. In recent years, domestic and foreign scholars hope to improve the microstructure of molybdenum alloy and improve the performance of molybdenum alloy by improving the doping mode of molybdenum alloy powder metallurgy. Studies have shown that the improvement of the doping mode will first improves the surface state of the alloy powder, making the particle size of the alloy powder finer and more uniform. Secondly, the sintered billet structure of the molybdenum alloy is more uniform, the crystal grains are finer, and the second phase particles are finer and more dispersed. Finally, the toughness of the molybdenum alloy is improved due to the presence of fine-grain strengthening and the mechanism of the second phase strengthening.
In this paper, the researches on the microstructure and properties of molybdenum alloys by doping methods in recent years are reviewed,the effects of doping methods on the powder state, microhardness, relative density, microstructure, distribution of second phase and mechanical properties of various molybdenum alloys has been analyzed. Based on the existing research, it has made a constructive outlook for the development of future doping methods, and has important reference significance for the production of molybdenum alloy.

Key words： molybdenum alloy alloying doping methods microstructure mechanical properties

Published: 27 April 2020

CLC number:

TG146

Fund:This work was financially supported by the Key Projects of the National key R&D Plan “Key Basic Materials Technology Improvement and Industrialization” (2017YFB0306000,2017YFB0305600), Shanxi Provincial Postdoctoral Fund (2017), The Youth Innovation Team of Shaanxi Universities (2019-2022), Fok Ying Tung Education Foundation (171101).

About author:: Shilei Li, a graduate student in material processing engineering at Xi’an University of Architecture and Technology, studied under Professor Ping Hu. His main research fields are the preparation of powder metallurgy low-oxygen molybdenum-titanium-zirconium alloy and the evolution of carbon and oxygen in molybdenum-titanium-zirconium alloy.
Ping Hu, born in January 1985, Ph.D., professor and doctoral supervisor of the Department of Materials Processing, School of Metallurgical Engineering, Xi’an University of Architecture and Technology. Selected as the Young Talents Supporting Program of Shaanxi University Science and Technology Association, Shaanxi Youth Science and Technology Star, the “Outstanding Talents of Young People” in Shaanxi Province, and the top talents of Shaanxi High-level Talents Special Support Program, Xi’an University of Architecture and Technology Batch of “excellent young scholars” Yanta scholars. His research interests include high-perfor-mance powder metallurgy molybdenum alloys and nano-functional materials. He has presided over 15 national research projects, including the National Key Research and Development Program Subproject, the National Na-tural Science Foundation, and the China Postdoctoral Science Foundation. In Nano Research, J. Alloy Comp., Mater. Sci. Eng. A, Materials Letters and other domestic and foreign academic journals published more than 50 papers; authorized 38 invention patents in China, authorized 2 utility model patents; won the first prize of China Nonferrous Metals Industry Science and Technology Award 2.

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	LI Shilei
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	DUAN Yi
	ZUO Yegai
	XING Hairui
	LI Hui
	DENG Jie
	FENG Pengfa
	WANG Kuaishe
	HU Boliang

Cite this article:

LI Shilei,HU Ping,DUAN Yi, et al. Research Status of the Effect of Doping Methods on Microstructure and Mechanical Properties of Molybdenum Alloy[J]. Materials Reports, 2020, 34(9): 9132-9142.

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http://www.mater-rep.com/EN/10.11896/cldb.18120082 OR http://www.mater-rep.com/EN/Y2020/V34/I9/9132

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