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本文研究ZnAl5-0.03合金超塑性拉伸变形的力学行为。实验表明,合金具有极优异的超塑性(δ≥5000％)。其超塑性能参量(δ、m)依温度变化的规律不同于一般的细晶材料,不存在呈现δ和m峰值的温度区间。合金在试验选取的范围内,应力对应变速率具有高的敏感性。合金呈现超塑效应的温度和应变速率范围均较宽广。轧制状态下,合金具有变形纤维组织,其对超塑变形有利,轧态合金可直接作为超塑态用于成形加工而不需进行特殊的超塑性处理,有利于工业应用。
In this paper, the mechanical behavior of superplastic tensile deformation of ZnAl5-0.03 alloy was studied. Experiments show that the alloy has excellent superplasticity (δ ≥ 5000%). The superplastic performance parameters (δ, m) vary with the temperature according to the law of the general fine grain materials, there is no δ and m peak temperature range. Alloy in the test selected range, the stress on the strain rate with high sensitivity. The superplastic effect of the alloy temperature and strain rate range are wide. In the rolled state, the alloy has a deformed fibrous structure, which is favorable for the superplastic deformation. The rolled alloy can be directly used as a superplasticizing state for forming without special superplasticity treatment, which is in favor of industrial application.