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Superplastic behavior of Zn-Al eutectoid alloy with 2 % Cu

机译：含2％Cu的Zn-Al共析合金的超塑性行为

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摘要

The effects of deformation temperature and strain rate on the superplastic behavior of the Zn-21Al- 2Cu alloy (Zinalco alloy) were investigated by uniaxial tensile tests. Results were compared with those of the Zn- 22Al eutectoid alloy without Cu. It was observed that additions of 2 % Cu leads to a decrease of the maximum strain attainable from 2600 % to 1000 %. The maximum strain in Zinalco alloy is obtained at lower strain rates. The presence of Cu increases the values of flow stress up to 600 % compared with those reported in the Zn-22Al alloy. Grain size sensitivity (p), true activation energy (Q _t), and constant A of the constitutive equation were not affected by presence of Cu unlike the stress exponent (n) which increased from 2.5 to 3.9. The main effect of Cu was to decrease the plastic flow stability of the Zn-22Al alloy. The results indicate that presence of Cu in the Zinalco alloy causes a hardening effect at low strain rates leading to a decrease in the strain rate sensitivity which promotes the formation and growth of sharp necks. Microstructural characterization suggests that the large deformations at necking could possibly be due to the substantial elongation capability of the Zn-rich phase (n).
机译：通过单轴拉伸试验研究了变形温度和应变速率对Zn-21Al-2Cu合金（Zinalco合金）超塑性行为的影响。将结果与不含铜的Zn-22Al共析合金进行了比较。观察到，添加2％的Cu导致可达到的最大应变从2600％降低至1000％。 Zinalco合金的最大应变是在较低的应变速率下获得的。与Zn-22Al合金相比，Cu的存在将流变应力值提高了600％。与应力指数（n）从2.5增加到3.9不同，晶粒的敏感性（p），真实活化能（Q _t）和本构方程的常数A不受Cu的影响。 Cu的主要作用是降低Zn-22Al合金的塑性流动稳定性。结果表明，Zinalco合金中Cu的存在会在低应变速率下引起硬化效应，从而导致应变速率敏感性降低，从而促进尖锐颈部的形成和生长。显微组织表征表明，颈缩处的大变形可能是由于富锌相（n）的显着伸长能力所致。

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