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。 Traditional gold hardness is low, restricting the artistic value of jewelry. The pure gold was micro-alloyed by cobalt, antimony and scandium, and the microstructure and hardening behavior of the modified gold were studied. The results show that the as-cast hardness of the modified plutonium (99.31 mass%) can reach 62 HV, and the microstructure shows a single solid solution structure with the hardness of 51 HV after the solution treatment at 700 ℃. When the solid solution state is cold deformed, the hardness reaches 121 HV at 80% strain deformation. After aging at 250 ℃, the precipitated phase appears dispersedly dispersed. The grain structure is remarkably refined than that of the traditional bare gold and the hardness reaches Up to 138 HV. The hardening behavior of modified gold is the result of solid solution strengthening, fine grain strengthening, deformation strengthening and precipitation strengthening combined action of alloying elements.