Effect of Al Addition on the Microstructure and Mechanical Properties of AlxCrCoNi Medium Entropy Alloys Prepared via the Magnetron Co-Sputtering

被引：7
|
作者：
Sun, Shuo [1 ,2 ]
Zai, Wei [3 ]
Chen, Yan [1 ,2 ]
Huang, Licheng [1 ,2 ]
Sun, Guixun [1 ,2 ]
Lian, Jianshe [1 ,2 ]
机构：
[1] Jilin Univ, Key Lab Automobile Mat, Minist Educ, Changchun 130025, Peoples R China
[2] Jilin Univ, Coll Mat Sci & Engn, Changchun 130025, Peoples R China
[3] Xian Rare Met Mat Inst Co Ltd, Xian 710016, Peoples R China
来源：
ADVANCED ENGINEERING MATERIALS | 2022年 / 24卷 / 08期
关键词：
co-sputtering; dual-phase structure; medium-entropy alloy; nanoindentation; strengthening mechanisms; STRAIN-RATE SENSITIVITY; GRAIN-SIZE DEPENDENCE; THIN-FILMS; STRENGTH; NI; DEFORMATION; TEMPERATURE; DUCTILITY; STABILITY; EVOLUTION;
D O I：
10.1002/adem.202101529
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of Al addition on the microstructural evolution, hardness, and deformation behavior of a nanostructured CrCoNi medium entropy alloy prepared by co-sputtering is studied in detail. With an increase in the Al content, the hardness of the alloy first increased (reaching 13.8 GPa) and then decreased (10.7 GPa), while the microstructure changed from nanocrystalline to a nanocrystalline/amorphous dual-phase structure. During plastic deformation, the appropriate amounts of the amorphous region and nanocrystalline mixed structure prevent shearing and grain rotation. Moreover, the amorphous shell also acts as a dislocation source that emitted and absorbed dislocations constantly and prevented grain boundary sliding to some extent. This work provides a novel approach to improve the mechanical properties of nanostructured medium entropy alloy films by controlling their composition and microstructure.
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收藏
页数：8
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