Improving Mechanical Properties of Fe-Mn-Co-Cr High-Entropy Alloy via Annealing after Cold Rolling

Yukun Lv; Pingtao Song; Yuzhe Wang; Xuerou Zhao; Wei Gao; Jie Zhang; Yutian Lei; Jian Chen

doi:10.3390/ma17030676

Improving Mechanical Properties of Fe-Mn-Co-Cr High-Entropy Alloy via Annealing after Cold Rolling

Materials (Basel). 2024 Jan 30;17(3):676. doi: 10.3390/ma17030676.

Authors

Yukun Lv¹, Pingtao Song¹, Yuzhe Wang¹, Xuerou Zhao², Wei Gao¹, Jie Zhang¹, Yutian Lei¹, Jian Chen¹

Affiliations

¹ School of Materials Science and Chemical Engineering, Xi'an Technological University, Xi'an 710021, China.
² School of Railway Equipment Manufacturing, Shaanxi Railway Institute, Weinan 714099, China.

Abstract

The as-cast (Fe50Mn30Co10Cr10)97C2Mo1 HEA (high entropy alloy) was prepared and cold-rolled at 70%. Subsequently, annealing heat treatment at different temperatures (900 °C, 950 °C, 1000 °C) was carried out. The microstructure evolution and mechanical properties of the HEA were systematically investigated. The results showed that the HEA annealed at 900 °C and 950 °C exhibited uneven grain size and rich σ precipitation phase at grain boundaries. The grains began to grow and complete recrystallization, and no σ phases were observed in HEA annealed at 1000 °C, which resulted in a higher tensile strength of ~885 MPa and elongation of ~68% compared with other annealed HEAs. The higher volume fraction of annealing twins with 60°<111> orientation was produced in HEA annealed at 1000 °C, which enhanced the tensile strength and plasticity via the Twinning-induced plasticity (TWIP) mechanism.

Keywords: HEA; annealing; deformation twin; microstructure.

Grants and funding

This research was funded by National Key Research and Development Program of China (2022YFE0122900) and the High-Level Talent Special Support Program Science and Technology Innovation Leading Talent Project of Shaanxi Provincial, The Key Research Plan Projects in Shaanxi Province (2023-YBGY-164, 2022QFY05-04). This work was also supported by the Special Research Plan of the Department of Education of Shaanxi Province (21JK0584) and the Research Plan Projects in Weinan city (2021TSZX-GY-38, 2022ZDYFJH-210), as well as the Aeronautical Science Foundation of China (202000290U1001).