摘要
本文采用了简单的预处理工艺,开发超硬铝合金LC9的超塑性;并以等温拉伸试验和等温压缩试验相互对照、相互补充的试验方法,考察LC9的超塑性唯象学特性。结果表明,该合金的最高延伸率可达220％,m值为0.4,流动应力最低可达10MPa;最佳超塑性变形条件为:温度420℃,应变速率1.67×10^(-3)s^(-1)。
Superplastic elongations in a high strength commercial Al-Zn-Mg-Cu alloy were developed by applying a simple pretrcatment techniqe to this material prior to tensile test. Both tension and compers.sion were used to study the alloy's superplastic deformation behavior. Test results show that the maximum elongation is 220%, the strain rate censitivitv index is 0.4 and the lowest flow stress is only 10 MPa. The optimum superplasticity deformation condition is at 420℃ and with the initial strain rate 1 .67 × 10-2 s- 1.
基金
国家自然科学基金的资助:5860274
关键词
超硬铝合金
超塑性
铝合金
LC9
high strength aluminu m alloy, superplas ticity, pretratment technique
