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本文研究Cu-Zn合金的超塑性条件。用工业用的Hpb59—1和H62铜棒,机加工成拉伸试样,经热处理,得到超塑性的微细组织。试样在高温拉伸机上以不同的温度和变形速度进行拉伸。试验表明,Hpb59—1黄铜在温度为620℃,拉伸速度为0.3毫米/分,出现了超塑性,延伸率达500％,未断;H62黄铜在温度为750℃,拉伸速度为0.2毫米/分时,出了超塑性,延伸率达624％,未断。本文还研究了Hpb 59—1和H 62黄铜的温度与拉伸速度之间的关系,并用金相显微镜和扫描电镜观察了试样变形前后显微组织的变化。
This article studies the Cu-Zn alloy superplasticity conditions. Using industrial Hpb59-1 and H62 copper rods, machined into tensile specimens, after heat treatment, to obtain superplastic microstructure. The sample is stretched at a high temperature at different temperatures and deformation speeds. Experiments show that, Hpb59-1 brass at a temperature of 620 ℃, the tensile speed of 0.3 mm / min, appeared superplastic, elongation of 500%, not broken; H62 brass at a temperature of 750 ℃, the tensile speed 0.2 mm / min, out of superplasticity, elongation of 624%, not broken. In this paper, the relationship between temperature and tensile speed of Hpb 59-1 and H 62 brass was also studied. The changes of microstructure before and after deformation were observed by optical microscope and scanning electron microscope.