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研究了Zn含量对Ag925CuZn合金显微组织和硬度的影响。结果表明:Zn显著抑制Ag925CuZn合金铸态组织中孔洞的形成,且在中间退火过程中使其晶粒粗化,在时效过程中形成具有与基体α-Ag成分、结构相同的浮凸状组织。同时,高Zn含量降低Ag925CuZn合金的固溶态硬度和时效态硬度;对于低Zn含量Ag925CuZn合金,固溶退火后合理的时效温度为200~250℃,冷变形后合理的时效温度为150~200℃。
The effect of Zn content on the microstructure and hardness of Ag925CuZn alloy was studied. The results show that Zn can significantly inhibit the formation of pores in the as-cast Ag925CuZn alloy and roughen the grains during the intermediate annealing process. In the aging process, the as-formed microstructure with the same α-Ag composition and structure is formed. At the same time, the high Zn content reduces the solid-solution hardness and the aging-state hardness of Ag925CuZn alloy. For Ag925CuZn alloy with low Zn content, the reasonable aging temperature after solution annealing is 200-250 ℃ and the reasonable aging temperature after cold deformation is 150-200 ℃.