部分再结晶CoCrFeNiTi高熵合金强度和延展性的预测

Prediction of Strength and Ductility in Partially Recrystallized CoCrFeNiTi High-Entropy Alloy.

作者信息

Zhang Hanwen, Liu Peizhi, Hou Jinxiong, Qiao Junwei, Wu Yucheng

机构信息

College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China.

Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China.

出版信息

Entropy (Basel). 2019 Apr 11;21(4):389. doi: 10.3390/e21040389.

DOI:10.3390/e21040389

PMID:33267103

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7514873/

Abstract

The mechanical behavior of a partially recrystallized fcc-CoCrFeNiTi high entropy alloys (HEA) is investigated. Temporal evolutions of the morphology, size, and volume fraction of the nanoscaled L1-(Ni,Co)Ti precipitates at 800 °C with various aging time were quantitatively evaluated. The ultimate tensile strength can be greatly improved to ~1200 MPa, accompanied with a tensile elongation of ~20% after precipitation. The temporal exponents for the average size and number density of precipitates reasonably conform the predictions by the PV model. A composite model was proposed to describe the plastic strain of the current HEA. As a consequence, the tensile strength and tensile elongation are well predicted, which is in accord with the experimental results. The present experiment provides a theoretical reference for the strengthening of partially recrystallized single-phase HEAs in the future.

摘要

研究了部分再结晶的面心立方结构CoCrFeNiTi高熵合金（HEA）的力学行为。定量评估了在800℃下不同时效时间时纳米级L1-(Ni,Co)Ti析出相的形态、尺寸和体积分数的时间演变。析出后，极限抗拉强度可大幅提高至约1200MPa，同时伴有约20%的拉伸伸长率。析出相平均尺寸和数密度的时间指数合理地符合PV模型的预测。提出了一个复合模型来描述当前高熵合金的塑性应变。结果，抗拉强度和拉伸伸长率得到了很好的预测，这与实验结果一致。本实验为未来部分再结晶单相高熵合金的强化提供了理论参考。