Research Progress on Strengthening and Ductilizing High-Entropy Alloys
TAN Yaqin1, WANG Xiaoming2, ZHU Sheng2, QIAO Junwei1
1 Research Center for High-entropy Alloys, School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China; 2 National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering, Beijing 100072, China
Abstract: High-entropy alloys (HEAs) have displayed promising application potential as structural materials owing to their excellent mechanical properties, such as high strength, high hardness, good corrosion and wear resistance. The research upon mechanical properties optimization for HEAs has provoked considerable attention and some preliminary achievements have been made. Traditionally, the strengthening mechanisms of alloys can be classified as solid-solution strengthening, dislocation hardening, grain-boundary strengthening and secondary-phase hardening. Because HEAs have high tendency to form solid solution, solid-solution strengthening is consi-dered as a major and effective way for HEAs. In this regard, we can use one of the principal elements or an element similar to other principal elements to generate substitution solid solution. Or we can add some atoms with small radius, such as C, N, and B, so the lattice distortions can be obtained. Thermo-mechanical techniques, as commonly used prior treatment method, are also applicable for HEAs, in which cold-rolling, for-ging, recrystallization annealing, etc. all can significantly increase dislocation density and refine grains. In addition, there is a more prevailing way in recent years-secondary-phase hardening. We can easily determine the annealing temperature by thermodynamic analysis to obtain secondary phase particles, and even to control their size and morphology. Thus HEAs' mechanical properties can be improved due to the interaction between dislocations and secondary phase particles, with either shearing mechanism or Orowan-bypassing mechanism. Apart from changing internal structure, surface treatment is also helpful in strengthening and ductilization. For HEAs with fine plasticity, carburizing & nitriding and coating generally facilitate to obtaining the structure with hard surface and ductile interior. The hardening effect of carburizing & nitriding stems from interstitial solid solution and secondary phase precipitation, while the role of coating process depends on the strong adhesion between coating and alloy substrate. This paper gives an elaborate description of strengthening and ductilizing effects of element doping and thermal treatment on HEAs, from the perspective of internal enhancing mechanism. It also involves some typical surface treatment methods favorable for mechanical improvement of HEAs.
作者简介: 谭雅琴,2015年6月毕业于陕西科技大学,获得工学学位。现为太原理工大学材料科学与工程学院硕士研究生,在乔珺威教授的指导下进行研究。目前主要研究的课题是热机械处理对高熵合金微观组织和力学性能的影响;乔珺威,太原理工大学材料科学与工程学院教授、博士生导师。2005年7月本科毕业于石家庄铁道大学(原军校)材料科学与工程学院,2011年1月在北京科技大学新金属材料国家重点实验室取得博士学位,期间赴美国田纳西大学进行联合培养。主要从事亚稳态金属材料力学与物理性能的研究。目前已在材料类期刊发表SCI收录科研论文120余篇,包括Materials Science and Engineering Report、Progress in Mate-rials Science、International Journal of Plasticity、Acta Materialia、Applied Phy-sics Letters等。
引用本文:
谭雅琴, 王晓明, 朱胜, 乔珺威. 高熵合金强韧化的研究进展[J]. 材料导报, 2020, 34(5): 5120-5126.
TAN Yaqin, WANG Xiaoming, ZHU Sheng, QIAO Junwei. Research Progress on Strengthening and Ductilizing High-Entropy Alloys. Materials Reports, 2020, 34(5): 5120-5126.
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2020, Vol. 34 
