铝青铜的准超塑性变形行为

Quasi-superplasticity Deformation Behavior of Aluminum Bronze

通过恒速度拉伸试验,对一种生产保持架用铝青铜的准超塑性进行研究。由正交试验法确定出最佳超塑性条件;分析了变形温度、初始应变速率和保温时间对其影响,并测定其力学性能。结果表明:此种铸态铝青铜,在860℃,保温10 min后以1×10-3s-1拉伸的最佳条件下,得到最大延伸率290%,m值曲线近似覆钟形。

The quasi-superplasticity of aluminum bronze for bearing cage was investigated through the constant velocity tensile test.The optimal superplastic condition was determined by orthogonal experiment.The effects of deformation temperature,initial strain rate and holding time on the superplasticity were analyzed.The mechanical property was measured.It is indicated that the elongation of as-cast aluminum bronzean can reach 290% at 860 ℃,holding 10 min and 1×10-3s-1 strain rate.The curve of m value is like a cover bell.