采用高能球磨机械合金化法制备了Au-20%Sn合金,分析了合金物相、组织和硬度随球磨时间的变化规律,探讨了合金塑性与合金组织及制备工艺的关系.结果表明:采用高能球磨机械合金化法可以制备Au-20%Sn合金;随球磨时间的增加,Au-20%Sn的合金化程度增加,组织中的金属间化合物逐渐增多,最终基本上为8相和ζ'相;合金的硬度随球磨时间的延长逐渐升高,并在球磨60 min后获得最高硬度104.2 HV,然后开始下降;球磨后的合金粉末在190℃×2 h的烧结过程中发生了不同程度的再结晶和晶粒长大,再结晶程度随球磨时间的延长而增加,导致烧结后合金硬度在球磨时间超过60 min后反而下降.
Au-20% Sn alloy was prepared by mechanical alloying of the mixture of Au and Sn powders and vacuum sintering process.The phases,microstructure and microhardness of Au-20% Sn alloy were analyzed,and the relationship among plasticity and microstructure and preparing process of Au-20% Sn alloy was discussed.The results show that Au-20% Sn alloy can be prepared by mechanical alloying.As the ball milling time of the powders increases,intermetallic compounds gradually form in the Au-20% Sn alloy and finally the microstructure of Au-20% Sn alloy is mainly composed of δ and ζ' phases.Microhardness of the alloy increases with increasing of the ball milling time,to the maximum value of 104.2 HV for the ball milling time of 60 min,and then the microhardness decreases.In the process of sintering at 190 ℃ for 2 h,recrystallization and crystal growth are observed,and the recrystallizing degree increases for the milled powders with increasing of the ball milling time and causes the decrease of the microhardness of Au-20% Sn alloy.
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