Shi Anjun, Li Ruixuan, Zhang Yong, Wang Zhe, Guo Zhancheng
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China.
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China.
Entropy (Basel). 2020 Nov 19;22(11):1318. doi: 10.3390/e22111318.
The influence of enhanced gravity on the microstructure and mechanical properties of the AlCoCrFeNi high-entropy alloy, which was solidified under normal gravity (acceleration 1 g) and enhanced gravity (acceleration 140 g, acceleration 210 g, and acceleration 360 g) conditions is reported in this paper. Its solidification under enhanced gravity fields resulted in refinement of the columnar nondendritic grain structure and an increase in the area fraction of the body-centered cubic (BCC) structure phases. The mass transfer strengthened by enhanced gravity promoted element diffusion and enrichment, which caused changes in the composition and microstructure that, in turn, affected the mechanical properties of the alloy. The compressive strength and plasticity of the sample solidified at acceleration 360 g were equal to 2845 MPa and 36.4%, respectively, which are the highest values reported to date for AlCoCrFeNi alloy.
本文报道了在正常重力（加速度1g）和增强重力（加速度140g、加速度210g和加速度360g）条件下凝固的AlCoCrFeNi高熵合金，增强重力对其微观结构和力学性能的影响。在增强重力场下的凝固导致柱状非枝晶晶粒结构细化，体心立方（BCC）结构相的面积分数增加。增强重力强化的传质促进了元素扩散和富集，这导致成分和微观结构发生变化，进而影响合金的力学性能。在加速度360g下凝固的样品的抗压强度和塑性分别等于2845MPa和36.4%，这是迄今为止报道的AlCoCrFeNi合金的最高值。
