作　　者： ; ; ; ; ;

机构地区： 广州番禺职业技术学院珠宝学院

出　　处： 《材料热处理学报》 2015年第5期5-9,共5页

摘　　要： 传统足金的硬度很低,制约了首饰的艺术价值。采用钴、锑、钪对纯金进行微合金化处理,研究了改性足金的显微组织和硬化行为。试验结果表明,改性足金(含金量99.31 mass%)的铸态硬度可达到62 HV,经700℃固溶处理后组织呈现单一固溶体结构,硬度可达到51 HV。固溶态材料经冷变形处理时,形变量为80%时硬度达到121 HV,再经250℃时效处理后出现了弥散分布的沉淀析出相,晶粒组织比传统足金显著细化,硬度达到了138 HV。改性足金的硬化行为是合金元素固溶强化、细晶强化、形变强化和析出强化综合作用的结果。 The hardness of traditional pure gold is very low and it restricts the jewelries' artistic value. Cobalt,antimony and scandium were used as the alloying elements in pure gold,and the microstructure and hardening behavior of the Co-Sb-Sc alloying pure gold were studied. The results show that the as-cast hardness of the modified pure gold is 62 HV,after the solution treatment at 700 ℃ for 0. 5 h,the microstructure is a homogeneous single phase and the hardness can reach 51 HV. After the solid solution material is cold worked with80% deformation rate,the hardness can reach 121 HV; and after ageing treatment at 250 ℃ for 6 h,tiny precipitation phases disperse in the matrix,the grain size is obviously finer than that of pure gold,and the hardness can reach 138 HV. The hardening mechanism of the modified pure gold is the comprehensive strengthening effects of solid solution,fine-grain,deformation and precipitation.

关 键 词： 足金 微合金化 硬化

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]