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 effects of Zn content on the microstructures and hardness of Ag925CuZn alloys were systematically investigated. The experimental results show that alloying element Zn significantly reduced the porosity of the as-cast microstructure of Ag925CuZn alloys and induced their grains coarsening during intermediate annealing and led convex microstructure forming during aging, which possesses face center cubic solid solution α-Ag. Moreover, high Zn content led to the decrease of solution-annealed hardness and aged hardness of Ag925CuZn alloys. For Ag925CuZn alloys with low Zn content, their proper aging temperatures are between 200℃ and 250℃ after solution-annealing, and their proper aging temperatures are between 150℃ and 200℃ after cold rolling.
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