@article{c10846f5363e489f98eb592bb7cf3cef,
title = "Development of strong and ductile metastable face-centered cubic single-phase high-entropy alloys",
abstract = "Face-centered cubic (fcc)-phase high-entropy alloys (HEAs) have attracted much academic interest, with the stacking fault energy (SFE) playing an important role in regulating their mechanical behaviors. Here, we revealed the principles for regulating both the elastic and plastic behaviors by composition modification and Mo addition in an fcc-phase quaternary CoCrFeNi system with the assistance of ab initio and thermodynamics calculations. An increase in Co content and a decrease in Fe and Ni contents reduced the fcc phase stability and SFE, but enhanced the elastic modulus, anisotropy, and lattice friction stress. A minor substitution of Co by Mo increased the lattice constant, but decreased the SFE and elastic modulus. Based on these findings, we developed a series of strong and ductile metastable fcc-phase CoxCr25(FeNi)70- xMo5 (x = 30, 40, 50) HEAs with mechanical properties superior to those of the CoCrFeNi HEAs. The careful investigation revealed that the enhanced mechanical properties are due to the Mo-addition-induced strengthening accompanied with a low-SFE-induced restriction of planar behavior of dislocations, mechanical twinning, and strain-induced martensitic transformation. The findings shed light on the development of high-performance HEAs.",
keywords = "High-entropy alloy, Martensitic transformation, Metastable, Stacking fault energy, Twinning",
author = "Daixiu Wei and Xiaoqing Li and Stephan Sch{\"o}necker and Jing Jiang and Choi, {Won Mi} and Lee, {Byeong Joo} and Kim, {Hyoung Seop} and Akihiko Chiba and Hidemi Kato",
note = "Funding Information: This work was primarily supported by Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (JSPS) KAKENHI (Grant No. 19K14838 ), the Core Research Cluster of Materials Science Fusion Research project (No. J180002408), and the {\textquoteleft}Creation of Life Innovation Materials for Interdisciplinary and International Researcher Development{\textquoteright} project, Tohoku University, Japan. This work is a cooperative program (Proposal No. 18G0424) of the Cooperative Research and Development Center for Advanced Materials, Institute for Materials Research, Tohoku University. A part of this work was supported by the Swedish Research Council (Grant Nos. 2016-00236 , 2017-06474 ), and the ab initio calculations were performed on resources provided by the Swedish National Infrastructure for Computing (SNIC) at the National Supercomputer Centre. Meanwhile, this work was partially supported by the Future Material Discovery Project of the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT of Korea ( NRF-2016M3D1A1023383 ). Mr. Weicheng Heng is acknowledged for the TEM sample preparation. Funding Information: This work was primarily supported by Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (JSPS) KAKENHI (Grant No. 19K14838), the Core Research Cluster of Materials Science Fusion Research project (No. J180002408), and the {\textquoteleft}Creation of Life Innovation Materials for Interdisciplinary and International Researcher Development{\textquoteright} project, Tohoku University, Japan. This work is a cooperative program (Proposal No. 18G0424) of the Cooperative Research and Development Center for Advanced Materials, Institute for Materials Research, Tohoku University. A part of this work was supported by the Swedish Research Council (Grant Nos. 2016-00236, 2017-06474), and the ab initio calculations were performed on resources provided by the Swedish National Infrastructure for Computing (SNIC) at the National Supercomputer Centre. Meanwhile, this work was partially supported by the Future Material Discovery Project of the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT of Korea (NRF-2016M3D1A1023383). Mr. Weicheng Heng is acknowledged for the TEM sample preparation. Publisher Copyright: {\textcopyright} 2019 Acta Materialia Inc.",
year = "2019",
month = dec,
doi = "10.1016/j.actamat.2019.09.050",
language = "English",
volume = "181",
pages = "318--330",
journal = "Acta Materialia",
issn = "1359-6454",
publisher = "Elsevier Limited",
}