退火对激光熔覆AlCoCrFeNiTi0.5高熵合金涂层组织和耐磨性的影响

Effects of Annealing on the Microstructure and Wear Resistance of AlCoCrFeNiTi0.5 High-entropy Alloy Coating Prepared by Laser Cladding

摘要:

对激光熔覆AlCoCrFeNiTi_0.5高熵合金涂层进行900℃退火,保温5h处理。主要对退火前后样品的微观结构和耐磨性进行研究。XRD结果表明，退火后的AlCoCrFeNiTi_0.5高熵合金涂层,其相组成有Co₃Ti和BCC结构的AlFe固溶相,出现典型的成分均匀的网状调幅分解组织；退火后的平均显微硬度达到989HV_0.5,比退火前提高了73.5%；耐磨性测试结果显示,退火后磨损量比退火前降低了92.5%,磨损宽度是退火前的50%。

Abstract:

Annealing behavior of AlCoCrFeNiTi0.5 high entropy alloy coatings prepared by laser cladding was investigated in this paper. The specimens were annealed at 900℃ for five hours. The microstructure and wear resistance property of the as-annealed and as-cast specimens were investigated in this study. The XRD results indicated that the as-annealed AlCoCrFeNiTi0.5 high entropy alloy coating was composed of Al80Cr13Co7, Co3Ti, and AlFe solid solution phase. The SEM results and EDS data showed that a typical spinodal decomposition structure with uniform composition formed after annealing treatment. The average Vickers micro-hardness of the as-annealed coatings could reach 989HV0.5 which was increased about 73.5% compared with that of the as-cast coatings. The abrasion resistance testing showed that the abrasion loss of the as-annealed coatings was reduced about 92.5% and the wear width was reduced about 50% compared with the values of as-cast coatings.