Hardness enhancement mechanism of AlxCoCrFeNiSi high-entropy alloy coatings prepared by laser cladding

被引：21
作者：
Han, Bin [3 ]
Zhang, Shiyi [1 ,2 ]
Zhang, Timing [1 ,2 ]
Chen, Yuhua [1 ,2 ]
Qin, Xuwei [1 ]
Li, Meiyan [3 ]
Hu, Chunyang [3 ]
Wei, Mingwei [1 ]
Xue, Xixin [3 ]
机构：
[1] Nanchang Hangkong Univ, Sch Aerosp Mfg Engn, Nanchang 330063, Peoples R China
[2] Nanchang Hangkong Univ, Jiangxi Key Lab Forming & Jointing Technol Aviat C, Nanchang 330063, Peoples R China
[3] China Univ Petr East China, Sch Mat Sci & Engn, Qingdao 266580, Peoples R China
来源：
INTERMETALLICS | 2023年 / 158卷
基金：
中国国家自然科学基金;
关键词：
Al x CoCrFeNiSi high-entropy alloy; Laser cladding; Hardness; Strengthening mechanism; Lattice distortion; INDENTATION;
D O I：
10.1016/j.intermet.2023.107909
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In the present work, AlxCoCrFeNiSi high-entropy alloy coatings with Al content of 0.3 and 1.0 were prepared by laser cladding technology. The microstructure and crystallographic structure evolution, hardness, and strengthening mechanisms were systematically investigated. The coherent interface between the BCC phase and Al-Ni nano-precipitate was confirmed by TEM analysis. Al0.3 coating exhibited a greater dislocation density and lots of sub-grain structures with grain boundary misorientation of less than 2.5 degrees. The average grain size decreased from 29.94 mu m to 20.05 mu m with the increase of Al from 0.3 to 1.0. Dislocation strengthening and solid solution strengthening were the major strengthening mechanisms for Al0.3 coating resulting in a hardness of 692 HV0.2, while solid solution strengthening and fine-grain strengthening were the strengthening mechanisms for Al1.0 coating with a hardness up to 711 HV0.2.
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页数：8
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