FeMnCoCr亚稳高熵合金的非均匀微观结构与拉伸性能

Heterogeneous Microstructure and Tensile Properties of FeMnCoCr Metastable High-Entropy Alloy.

作者信息

Sun Xiuying, Zhou Wei, Li Zhanjiang, Hong Chunfu, Chang Fa, Tian Jun, Dai Pinqiang

机构信息

College of Materials Science and Engineering, Fujian University of Technology, Fuzhou 350118, China.

Fujian Provincial Key Laboratory of New Material Preparation and Forming Technology, Fuzhou 350118, China.

出版信息

Materials (Basel). 2024 Dec 1;17(23):5893. doi: 10.3390/ma17235893.

DOI:10.3390/ma17235893

PMID:39685328

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11643593/

Abstract

Face-centered cubic (FCC)-structured high-entropy alloys (HEAs) are facing a major challenge due to a trade-off between strength and ductility. In this paper, we systematically investigated the microstructural evolution and tensile properties of metastable dual-phase (DP) FeMnCoCr HEAs via cold rolling and partial recrystallized annealing, which resulted in a heterogeneous microstructure, and by inducing strengthening and strain-hardening through heterogeneous deformation-induced (HDI) strategies. The results show that the alloy was annealed at 600 °C for 10 min, exhibiting a good combination of strength and ductility. A higher alloy strength was obtained via HDI strengthening, while FCC → HCP phase transformation, deformation twins, and HDI strain-hardening contributed to the excellent ductility. The results provide a viable method for the design of subsequent alloys.

摘要

面心立方（FCC）结构的高熵合金（HEA）由于强度和延展性之间的权衡而面临重大挑战。在本文中，我们通过冷轧和部分再结晶退火系统地研究了亚稳态双相（DP）FeMnCoCr高熵合金的微观结构演变和拉伸性能，这导致了微观结构的不均匀性，并通过非均匀变形诱导（HDI）策略实现强化和应变硬化。结果表明，该合金在600°C下退火10分钟，表现出强度和延展性的良好结合。通过HDI强化获得了更高的合金强度，而FCC→HCP相变、变形孪晶和HDI应变硬化则促成了优异的延展性。这些结果为后续合金的设计提供了一种可行的方法。