| Autor: |
Wang, Lei, Zhou, Haotian, Chen, Yazhou, Gao, Yongfei, Gan, Qingming, Li, Zhi, Xi, Yuntao, Zhang, Keren, Xu, Shanna, Liu, Haitao, Wen, Lei, Xiao, Xinke, Ji, Jiangtao |
| Předmět: |
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| Zdroj: |
Journal of Materials Engineering & Performance; Mar2024, Vol. 33 Issue 5, p2051-2063, 13p |
| Abstrakt: |
Since the medium entropy alloy (MEA) was proposed, it has become one of the key areas of material research. Due to the multiple components in the MEA, it has a variety of combinations, and it usually shows high strength, high plasticity and excellent fracture toughness at low temperature. However, at high temperature, its comprehensive mechanical properties and toughness are significantly reduced, which greatly limits its application in engineering. This paper reviews the mechanical properties of MEAs, and discusses the effects of transformation strengthening, solution strengthening and plastic deformation on the fracture toughness of MEAs at high temperatures. It is found that the MEA has competitive impact fracture toughness at low temperature, but with the increase in temperature, the comprehensive mechanical properties of MEA materials will continue to decline, and the impact fracture toughness value will also reduce. The mechanical properties of high/medium entropy alloy can be improved obviously by introducing carbon, oxygen, nitrogen, boron and other interstitial elements. By introducing alloying elements into MEA systems, additional strengthening effects such as solution strengthening, grain boundary strengthening and precipitation strengthening can be achieved, thus improving the fracture toughness of materials at high temperatures. The gradient twin structure constructed by plastic deformation will not change the stacking fault energy (SFE) of MEAs, which is an effective method to improve the quasi-static and impact toughness of MEA. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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