Amorphous structure in a laser clad Ni-Cr-Al coating on Al-Si alloy
来源期刊：中国有色金属学报(英文版)2000年第2期
论文作者：梁工英 黄俊达 苏俊义 胡仲豪
文章页码：220 - 223
Key words：laser surface treatment; aluminum alloy; amorphous structures
Abstract: 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 Ni3Al 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.
