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首页> 外文期刊>Journal of Materials Engineering and Performance >Superplastic characteristics of fine-grained 7475 aluminum alloy
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Superplastic characteristics of fine-grained 7475 aluminum alloy

机译：细粒7475铝合金的超塑性特征

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A 7475-aluminum alloy was subjected to a thermomechanical heat treatment that resulted in a final recrystallized grain size on the order of 10 µm. Tensile specimens of dimensions 10 × 4 × 2.3 mm were machined such that the tensile axis was parallel to the rolling direction. Tensile tests were carried out at high temperatures in the range of 773 to 803 K at different cross-head speeds corresponding to initial strain rates in the range of 10−4 to 10−2 s−1. Elongations of several hundred percent were observed at strain rates of <10−3 s−1. The correlation between flow stress and strain rate suggests that the strain rate sensitivity m is close to 0.5 at the lower strain rates. The value of m decreases to ≈0.2 at high strain rates. The decrease in m suggests a transition in the rate-controlling process from superplastic deformation (m ≈ 0.5) to dislocation creep (m ≈ 0.2) with increasing strain rate. The calculated activation energies in the two deformation regions are consistent with the suggested rate-controlling processes.
机译：对7475铝合金进行热机械热处理，使最终重结晶晶粒尺寸约为10 µm。加工尺寸为10×4×2.3 mm的拉伸试样，使拉伸轴平行于轧制方向。拉伸试验在773至803 K的高温下以对应于10–4 至10-2 s-1 <范围内的初始应变率的不同十字头速度进行。 / sup>。在<10-3 s-1 的应变速率下观察到百分之百的伸长。流变应力与应变率之间的相关性表明，在较低应变率下，应变率灵敏度m接近0.5。在高应变速率下，m的值减小至≈0.2。 m的减小表明，随着应变速率的增加，速率控制过程从超塑性变形（m≈0.5）到位错蠕变（m≈0.2）过渡。在两个变形区域中计算出的活化能与建议的速率控制过程一致。

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