Amorphous structure in a laser clad Ni-Cr-Al coating on Al-Si alloy

作     者：梁工英 苏俊义 黄俊达 胡仲豪 

作者机构：Xi An Jiao Tong Univ Sch Mech Engn Xian 710049 Peoples R China Hong Kong Polytech Univ Dept Mech Engn Hong Kong Hong Kong Peoples R China 

出 版 物：《中国有色金属学会会刊：英文版》 (Transactions of Nonferrous Metals Society of China)

年 卷 期：2000年第10卷第2期

页      面：220-223页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：FoundationofStateKeyLaboratoryofSolidificationProcessingandHongKongPolytechnicUniversity 

主　　题：laser surface treatment aluminum alloy amorphous structures 

摘      要：A mixing microstructure containing Ni based amorphous structures was observed by TEM in the laser clad zones. As the uniformity of chemical composition and temperature is poor in the laser cladding, the amorphous structure with some Ni 3Al crystals coexists in the cladding. The microhardness of the mixing amorphous structure is HV 600～800, which is lower than that of crystal phases in the coating. Differential thermal analysis (DTA) shows that Ni based amorphous structure exhibits a higher initial crystallizing temperature (about 588 ℃), which is slightly higher than that of the eutectic temperature of Al Si alloy. The wear test results indicate that there are some amorphous structures in the laser clad coating, which reduces the peeling of the granular phases from matrix, and improves the wear resistance.