2022年12月
Si-addition contributes to overcoming the strength-ductility trade-off in high-entropy alloys
INTERNATIONAL JOURNAL OF PLASTICITY
- 巻
- 159
- 号
- 開始ページ
- 103443
- 終了ページ
- 103443
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1016/j.ijplas.2022.103443
- 出版者・発行元
- PERGAMON-ELSEVIER SCIENCE LTD
Face-centered cubic single-phase high-entropy alloys (HEAs) containing multi-principal transition metals have attracted significant attention, exhibiting an unprecedented combination of strength and ductility owing to their low stacking fault energy (SFE) and large misfit parameter that creates severe local lattice distortion. Increasing both strength and ductility further is challenging. In the present study, we demonstrate via meticulous experiments that the CoCrFeNi HEA with the addition of the substitutional metalloid Si can retain a single-phase FCC structure while its yield strength (up to 65%), ultimate strength (up to 34%), and ductility (up to 15%) are simultaneously increased, owing to a synthetical effect of the enhanced solid solution strengthening and a reduced SFE. The dislocation behaviors and plastic deformation mechanisms were tuned by the addition of Si, which improves the strain hardening and tensile ductility. The present study provides new strategies for enhancing HEA performance by targeted metalloid additions.
- リンク情報
- ID情報
-
- DOI : 10.1016/j.ijplas.2022.103443
- ISSN : 0749-6419
- eISSN : 1879-2154
- Web of Science ID : WOS:000868938200002