7A52铝合金高温拉伸性能研究
首发时间:2011-03-18
摘要:采用高温拉伸实验研究了200-350℃温度范围和0.0005s-1 - 0.1s-1应变速率范围内7A52铝合金高温拉伸变形行为,建立了该材料的高温拉伸塑性变形本构关系。结果表明,应变速率和变形温度的变化强烈影响合金流变应力的大小,流变应力随变形温度升高而降低,随应变速率提高而增大;可用Zener-Hollomon参数的本构方程来描述7A52铝合金高温拉伸变形时的流变应力行为,变形激活能为221kJ/mol。
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Tensile properties of 7A52 aluminum alloy at elevated temperatures
Abstract:Mechanical properties of 7A52 aluminium alloy were investigated by tensile tests in the temperature and strain rate ranges of 200-350℃ and 0.0005s-1 to 0.1s-1, respectively. And the constitutive relationship was also established. As expected, the flow stress increases with the increase of strain rate, and decreases with the increase of the deforming temperature. The flow stress of the 7A52 aluminium alloy during hot tensile deformation can be described by using Zener-Hollomon parameter including Arrhenius item, and the deformation activation energy is estimated to be 221kJ/mol.
Keywords: 7A52 aluminum alloy hot tensile properties constitutive relationship
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No.4416216574097130****
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