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首页> 外文期刊>Materials Science and Engineering >Biaxial deformation behavior and formability of precipitation hardened ultra-fine grained (UFG) Cu-Cr-Zr alloy
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Biaxial deformation behavior and formability of precipitation hardened ultra-fine grained (UFG) Cu-Cr-Zr alloy

机译：沉淀硬化超细Cu-Cr-Zr合金的双轴变形行为和成形性

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摘要

The combined effects of ultrafine-grained (UFG) microstructure and precipitation on the formability and biaxial deformation behavior of a Cu-Cr-Zr alloy were investigated. The UFG microstructure formation results in good formability with an Erichsen index (Ei) of 4.05 mm compared to that of peak-aged coarse grained (CG) alloy (3.95 mm). Aging heat treatments increase strength and formability of the UFG alloy simultaneously. Biaxial deformation behavior is found to be dependent on the strain hardenability. Excellent strain hardenability of the CG alloy brought about higher punch displacement within the membrane stretching regime. However, deformation localization with the early onset of necking is evident in the UFG alloy. Subsequent aging treatments decrease deformation localization behavior of UFG alloy with increasing aging durations. Results also show that both grain refinement and aging increased the punch load due to enhanced strength. A linear relationship is generated based on punch load vs. punch displacement curve slope to predict ultimate tensile strength (UTS) with high accuracy. It is concluded that synergetic effect of UFG microstructure formation and subsequent aging provides a simple and effective procedure to produce Cu-Cr-Zr alloy for applications where balance of strength and formability are needed.
机译：研究了超细晶粒（UFG）的组织和沉淀对Cu-Cr-Zr合金可成形性和双轴变形行为的综合影响。与峰值时效粗粒（CG）合金（3.95 mm）相比，UFG微结构的形成具有良好的可成形性，埃里克森指数（Ei）为4.05 mm。时效热处理可同时提高UFG合金的强度和可成形性。发现双轴变形行为取决于应变可淬性。 CG合金的出色应变淬透性在膜拉伸范围内带来了更高的冲头位移。但是，UFG合金中会出现颈缩早期开始时的变形局部化。随后的时效处理会随着时效时间的延长而降低UFG合金的变形局部化行为。结果还表明，由于强度提高，晶粒细化和时效处理均增加了冲头负荷。根据冲头载荷与冲头位移曲线的斜率生成线性关系，以高精度预测极限抗拉强度（UTS）。结论是，UFG微观结构形成和随后时效的协同作用为生产需要强度和可成形性平衡的应用提供了一种简单有效的生产Cu-Cr-Zr合金的方法。

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