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首页> 外文期刊>Journal of Materials Engineering and Performance >Using Equal-Channel Angular Pressing for the Production of Superplastic Aluminum and Magnesium Alloys
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Using Equal-Channel Angular Pressing for the Production of Superplastic Aluminum and Magnesium Alloys

机译：使用等通道角挤压生产超塑性铝和镁合金

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摘要

Equal-channel angular pressing (ECAP) is a useful tool for achieving exceptional grain refinement in bulk metallic alloys. Typically, the grain sizes produced through ECAP are in the submicrometer range, and thus they are smaller by up to an order of magnitude than the grain sizes attained through typical thermomechanical treatments. As a consequence of these ultrafine grains, the as-pressed alloys may exhibit superplastic ductilities at faster strain rates than in conventional superplastic alloys. This work initially describes the application of ECAP to two different alloys. First, results are presented for a commercial Al-2024 alloy where this alloy was selected because it contains no minor additions of either zirconium or scandium to assist in restricting grain growth. The results show that superplasticity is achieved through the use of ECAP. Second, results are described for a Mg-0.6 percent Zr alloy where this alloy was selected because it is the optimum composition for achieving a high damping capacity. Again, processing by ECAP produces superplastic ductilities not attained in the cast alloy. The second part of this work demonstrates that processing by ECAP may be extended from conventional rod or bar samples to samples in the form of plates. This is a very attractive feature for industrial superplastic forming applications.
机译：等通道角挤压（ECAP）是一种用于在块状金属合金中实现出色晶粒细化的有用工具。通常，通过ECAP产生的晶粒尺寸在亚微米范围内，因此，与通过典型的热机械处理获得的晶粒尺寸相比，其尺寸要小一个数量级。由于这些超细晶粒，所压制的合金可以以比常规超塑合金更快的应变速率展现超塑延性。这项工作最初描述了ECAP在两种不同合金上的应用。首先，给出了商用Al-2024合金的结果，选择该合金是因为它不包含微量添加的锆或to以帮助限制晶粒长大。结果表明，通过使用ECAP可实现超塑性。其次，描述了Mg-0.6％Zr合金的结果，选择了该合金是因为它是实现高阻尼能力的最佳组成。同样，通过ECAP进行加工会产生铸造合金无法达到的超塑性延展性。这项工作的第二部分表明，通过ECAP进行的处理可以从常规的棒状或棒状样品扩展到板状样品。对于工业超塑成型应用而言，这是一个非常吸引人的功能。

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