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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：细晶粒7475铝合金的超塑性特征

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摘要

A 7475-aluminum alloy was subjected to a thermomechanical heat treatment that resulted in a final recrystallized grain size on the order of 10 pm. Tensile specimens of dimensions 10 X 4 X 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 dose to 0.5 at the lower strain rates. The value of m decreases to approx = 0.2 at high strain rates. The decrease in m suggests a transition in the rate-controlling process from superplastic deformation (m approx = 0.5) to dislocation creep (m approx = 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，使最终再结晶晶粒尺寸约为10 pm。加工尺寸为10 X 4 X 2.3 mm的拉伸试样，使拉伸轴平行于轧制方向。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拉伸测试。 。在<10〜（-3）s〜（-1）的应变速率下观察到百分之百的伸长。流动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为0.5。在高应变速率下，m的值减小至大约= 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约= 0.5）到位错蠕变（m约= 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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