温轧态2618A铝合金高应变速率超塑性的研究

Study of High Strain Rate Superplasticity of 2618A Aluminum Alloy

对温轧态２６１８Ａ铝合金在不同温度（４７０～５５０℃）和应变速率为１０￣（－３）～１０￣（０）ｓ￣（－１）范围内的超塑性进行了研究，确定了最佳超塑性变形规范：在５００～５３０℃温度范围内，应变速率为２．８×１０￣（－１）ｓ￣（－１）的条件下，可获得大于２３０％的延伸率，表明该合金具有高应变速率超塑性的特性。

The superplasticity of warm-rolled 26 1 8A aluminum alloy has been investigated at temperatures 470～550℃ and strain rate range of 10￣(-3)～10￣(-1)S￣(-1),and optimum superplastic deformation conditions have been determined. When the temperature is within 500～530℃ and the strain rate is of 2.8×10￣(-1)S￣(-1),an elongation of above 230% can be obtained, this demonstrates that warm-rolled 2618A aluminum alloy has high strain rate superplastic property.