Journal
OPTICS AND LASER TECHNOLOGY
Volume 145, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2021.107518
Keywords
CoCrNiTi; CrFeNiTi; Medium-entropy alloy; Coating; Laser cladding; Wear resistance
Categories
Funding
- Technology Innovation and Appli-cation Development Project of Chongqing [cstc2020jscx-msxmX0213]
- Postdoctoral Science Foundation of China [2021M690174]
- Graduate Student Innovation Program of Chongqing University of Technology [CLGYCX20203028]
- University Innovation Research Group of Chongqing [CXQT20023]
- Chongqing Key Laboratory of Materials Surface & Interface Science [KFJJ2005]
- Open Projects of Key Laboratory of Advanced Technologies of Materials (Ministry of Education) at Southwest Jiaotong University [KLATM202009]
- Open Foundation of Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials at Guangxi University [2021GXYSOF06]
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Two medium-entropy alloy coatings (MEACs) were successfully prepared on pure Ti sheet using pulsed laser cladding, exhibiting significantly improved hardness and wear resistance compared to the pure Ti substrate. The excellent properties of the MEACs are attributed to the combined strengthening effects of solid-solution, short-range order, grain refinement, and the Cr2Ti Laves phase.
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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