Research Development of Mechanical Properties and Microstructure Stability of Cantor Alloys
PANG Baolin1, WANG Man1,2, XI Xiaoli1,3
1 Key Laboratory of Advanced Functional Materials, Ministry of Education, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China 2 National Engineering Laboratory for Industrial Big-data Application Technology, Beijing University of Technology, Beijing 100124, China 3 Collaborative Innovation Center of Capital Resource-recycling Material Technology, Beijing University of Technology, Beijing 100124, China
Abstract: Cantor alloy was first proposed by professor B. Cantor from the UK in 2004. It is a kind of high-entropy alloy which is composed of five principal elements including cobalt, chromium, iron, manganese and nickel with equal atomic ratio or close to equal atomic ratio. This alloy exhibits a single FCC structure and has four unique effects of high-entropy alloys, including high-entropy effect in thermodynamics, lattice distortion effect in structure, hysteresis diffusion effect in dynamics and cocktail effect in performance. Based on these four effects, Cantor alloy has excellent mechanical properties, wear resistance, corrosion resistance and ductility. Especially, it shows good fracture toughness and tensile strength at low temperature, which makes it the most promising material in the future. In this paper, the four unique effects of high-entropy alloys are briefly introduced, and the common preparation methods are compared with a summary of advantages and disadvantages of different methods. Among them, vacuum arc melting coupled with copper mold casting, the most commonly used method for Cantor alloy, is discussed in detail. The evaluation of mechanical properties with temperature of Cantor alloy is summarized. Both the tensile strength and elongation gradually increase with temperature decreasing, which is benefited from the formation of nano twins. The fault energy of Cantor alloy will decrease at low temperature and consequently the twins are easily to form, resulting in the change of deformation mechanism from dislocation slip to nano twins. However, the mechanical properties of Cantor alloy at high temperature are relatively poor. Also, the yield strength of Cantor alloy at room temperature is less than 300 MPa, which is insufficient for applications as candidate structu-ral materials. Then research works concerning about the improvement of mechanical properties of Cantor alloy are summarized, including severe plastic deformation and introduction of dispersion particles, both of which aim to improve mechanical properties by grain refinement. According to the research results, Cantor alloys exhibit stable FCC structure when the annealing temperature is higher than 1 073 K, while different kinds of precipitates will form during annealing when the temperature is lower than 1 073 K. Finally, the prospect development is given based on the above summarization of recent development results in Cantor alloys.
庞宝林, 王曼, 席晓丽. Cantor合金力学性能及其组织稳定性研究进展[J]. 材料导报, 2022, 36(2): 20080242-5.
PANG Baolin, WANG Man, XI Xiaoli. Research Development of Mechanical Properties and Microstructure Stability of Cantor Alloys. Materials Reports, 2022, 36(2): 20080242-5.
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2022, Vol. 36 
