期刊
PHYSICAL REVIEW LETTERS
卷 127, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.127.115704
关键词
-
资金
- U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences, Materials Science and Engineering Division
- U.S. DOE [DEAC02-07CH11358]
- QNRF [NPRP11S-1203-170056]
High-entropy alloys and medium-entropy alloys are unique materials in which property relations can be controlled through alloying and chemical disorder. Research has shown that in Fe-Mn-based alloys, the energy difference between face-centered cubic and hexagonal-close-packed phases directly correlates with martensitic transformation and chemical short-range order.
High-entropy alloys and even medium-entropy alloys are an intriguing class of materials in that structure and property relations can be controlled via alloying and chemical disorder over wide ranges in the composition space. Employing density-functional theory combined with the coherent-potential approximation to average over all chemical configurations, we tune free energies between face-centered-cubic and hexagonal-close-packed phases in FexMn80-xCo10Cr10 systems. Within Fe-Mn-based alloys, we show that the martensitic transformation and chemical short-range order directly correlate with the face-centered-cubic and hexagonal-close-packed energy difference and stacking-fault energies, which are in quantitative agreement with recent observation of two phase region (face-centered cubic and hexagonal closed pack) in a polycrystalline high-entropy alloy sample at x = 40 at.%. Our predictions are further confirmed by single-crystal measurements on a x = 40 at.% using transmission-electron microscopy, selective-area diffraction, and electron-backscattered-diffraction mapping. The results herein offer an understanding of transformation-induced or twinning-induced plasticity in this class of high-entropy alloys and a design guide for controlling the physics at the electronic level.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据