ZL111 Al合金激光熔覆中的非晶组织及其半定量测定  

THE AMORPHOUS STRUCTURES AND THEIR SEMIQUANTITAIVE DETERMINATION IN LASER CLADDING ON ZL111 ALUMINUM ALLOY

作　　者：李现勤[1] 程兆谷[1] 夏金安[1] 许国良[1] 梁工英[2] 

机构地区：[1]中国科学院上海光学精密机械研究所,上海201800 [2]西安交通大学机械工程学院,西安710049

出　　处：《金属学报》1999年第9期928-933,共6页Acta Metallurgica Sinica

基　　金：西北工业大学凝固技术国家重点实验室基金

摘　　要：利用5kWCO2激光器激光熔覆Al合金表面的Ni－Cr－Al涂层，SEM与TEM分析结果表明，在激光熔覆层中的非晶组织呈空间扭曲薄片或杉叶状，它们分别存在于熔覆层颗粒间白色网状组织与颗粒中,利用差热分析（DTA）半定量测定熔覆层中的非晶含量，功率密度。The coating zone (Ni-Cr-Al) on an aluminum alloy surface was clad by a 5kW CO2 laser.The observation of SEM and TEM revealed that there are amorphous structures in the laser cladding. Theamorphous structures have two different morphologies. One is space curved plate-like, which exists in thewhite web-like structures. The other is fir leaf-like, which exists in the grain-like structures. Differentialthermal analysis (DTA) was used to semi- quantitatively determine the content of amorphous structures inlaser-cladding. It was found that the power density and the scanning velocity affect obviously the contentof amorphous structures.

关 键 词：激光熔覆 差热分析 半定量测定 铝合金 非晶组织 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG166.399[金属学及工艺—金属材料]