Investigation of microstructure and wear resistance of laser-clad CoCrNiTi and CrFeNiTi medium-entropy alloy coatings on Ti sheet

被引：72
作者：
Xiang, Kang [1 ]
Chai, Linjiang [1 ,2 ]
Zhang, Chengquan [1 ]
Guan, Haotian [1 ]
Wang, Yueyuan [1 ]
Ma, Yanlong [1 ]
Sun, Qi [3 ]
Li, Yuqiong [4 ]
机构：
[1] Chongqing Univ Technol, Coll Mat Sci & Engn, Chongqing 400054, Peoples R China
[2] Chongqing Univ Arts & Sci, Chongqing Key Lab Mat Surface & Interface Sci, Chongqing 402160, Peoples R China
[3] Southwest Jiaotong Univ, Minist Educ, Key Lab Adv Technol Mat, Chengdu 610031, Peoples R China
[4] Guangxi Univ, MOE Key Lab New Proc Technol Nonferrous Met & Mat, Guangxi Key Lab Proc Nonferrous Met & Featured Ma, Nanning 530004, Peoples R China
来源：
OPTICS AND LASER TECHNOLOGY | 2022年 / 145卷
关键词：
CoCrNiTi; CrFeNiTi; Medium-entropy alloy; Coating; Laser cladding; Wear resistance; BEHAVIOR; HARDNESS;
D O I：
10.1016/j.optlastec.2021.107518
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Two medium-entropy alloy coatings (MEACs), CoCrNiTi and CrFeNiTi, were successfully prepared on pure Ti sheet by utilizing pulsed laser cladding. Microstructural characterization reveals that both the MEACs are mainly comprised of BCC solid-solution phase along with interdendritic Cr2Ti Laves phase (C14 type) due to element segregation. Hardness and wear tests show that the CoCrNiTi MEAC has a hardness of 762 +/- 32 HV and a specific wear rate of 1.7 x 10(-5) mm(3.)N(-1).m(-1), and those of the CrFeNiTi MEAC are 820 +/- 34 HV and 2.8 x 10(-5) mm(3).N-1.m(-1), respectively, both of which are markedly superior to the pure Ti substrate (114 +/- 5 HV and 5.4 x 10(-4) mm(3).N-1.m( -1)). Comprehensive analyses suggest that the excellent properties of the MEACs can be attributed to combined strengthening effects of solid-solution, short-range order, grain refinement and the Cr2Ti Laves phase.
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页数：9
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