Microstructure and dry sliding wear behavior of laser clad AlCrNiSiTi multi-principal element alloy coatings  

作　　者：Can Huang Yi-Zhou Tang Yong-Zhong Zhang An-Ping Dong Jian Tu Lin-Jiang Chai Zhi-Ming Zhou 

机构地区：[1]School of Materials Science and Engineering,Chongqing University of Technology,Chongqing 400054,China [2]Chongqing Municipal Key Laboratory of Institutions of Higher Education for Mould Technology,Chongqing 400054,China [3]Center for Composites,General Research Institute forNonferrous Metals,Beijing 100088,China [4]Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《Rare Metals》2017年第7期562-568,共7页稀有金属（英文版）

基　　金：supported by the Chongqing Research Program of Basic Research and Frontier Technology(No.CSTC2013jcyjA50016);the National Natural Science Foundation of China(Nos.51401039,51571037 and 51204110);the Scientific and Technological Research Program of Chongqing Municipal Education Commission(No.KJ1709204).

摘　　要：The approximately equimolar ratio A1CrNiSiTi multi-principal element alloy （MPEA） coatings were fab- ricated by laser cladding on Ti-6Al-4V （Ti64） alloy. Scanning electron microscopy （SEM）, equipped with an energy-dispersive spectroscopy （EDS）, and X-ray diffrac- tion （XRD） were used to characterize the microstructure and composition. Investigations show that the coatings consist of （Ti, Cr）5Si3 and NiA1 phases, formed by in situ reaction. The phase composition is initially explicated according to obtainable binary and ternary phase diagrams, and the formation Gibbs energy of TisSi3, VsSi3 and CrsSi3. Dry sliding reciprocating friction and wear tests of the A1CrNiSiTi coating and Ti64 alloy substrate without coating were evaluated. A surface mapping profiler was used to evaluate the wear volume. The worn surface was characterized by SEM-EDS. The hardness and wear resistance of the A1CrNiSiTi coating are well compared with that of the basal material （Ti64）. The main wear mechanism of the AICrNiSiTi coating is slightly adhesive transfer from GCrl5 counterpart, and a mixed layer com- posed of transferred materials and oxide is formed.The approximately equimolar ratio A1CrNiSiTi multi-principal element alloy （MPEA） coatings were fab- ricated by laser cladding on Ti-6Al-4V （Ti64） alloy. Scanning electron microscopy （SEM）, equipped with an energy-dispersive spectroscopy （EDS）, and X-ray diffrac- tion （XRD） were used to characterize the microstructure and composition. Investigations show that the coatings consist of （Ti, Cr）5Si3 and NiA1 phases, formed by in situ reaction. The phase composition is initially explicated according to obtainable binary and ternary phase diagrams, and the formation Gibbs energy of TisSi3, VsSi3 and CrsSi3. Dry sliding reciprocating friction and wear tests of the A1CrNiSiTi coating and Ti64 alloy substrate without coating were evaluated. A surface mapping profiler was used to evaluate the wear volume. The worn surface was characterized by SEM-EDS. The hardness and wear resistance of the A1CrNiSiTi coating are well compared with that of the basal material （Ti64）. The main wear mechanism of the AICrNiSiTi coating is slightly adhesive transfer from GCrl5 counterpart, and a mixed layer com- posed of transferred materials and oxide is formed.

关 键 词：Laser cladding Multi-principal element alloy MICROSTRUCTURE Wear behavior 

分 类 号：TG174.4[金属学及工艺—金属表面处理]