Temperature-dependent constitutive behavior with consideration of microstructure evolution for as-quenched Al-Cu-Mn alloy

Temperature-dependent constitutive behavior with consideration of microstructure evolution for as-quenched Al-Cu-Mn alloy
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考虑淬火态 Al-Cu-Mn 合金微观结构演化的温度相关本构行为

DOI:
10.1016/j.msea.2016.09.090
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发表时间:
2016-12
期刊:
Materials Science & Engineering A
影响因子:
--
通讯作者:
Yiming Rong
Yiming Rong
中科院分区:
其他
文献类型:
--
作者:
Wenguang Wang;Gang Wang;Yisen Hu;Guannan Guo;Tingting Zhou;Yiming Rong

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由于复杂的硬化机制,很难预测 Al-Cu-Mn 合金在淬火过程中的变形行为。在本文中,等温拉伸试验是在受控实验条件(298–773 K 和 0.001–0.1/s 应变速率)下进行的。对合金显微组织的观察和应力-应变曲线的拉伸试验分析均证实,变形机制在298-473 K和573-773 K下存在显着差异。因此,建立了温度相关的本构模型来表征淬火态Al-Cu-Mn合金的发散流动行为。此外,模型中的活化能Q是由位错林和沉淀相的综合效应决定的,随着实验条件的不同而不同。
It is difficult to predict the deformation behavior of Al-Cu-Mn alloy during a quenching process due to the complex hardening mechanisms. In this paper, isothermal tensile tests were conducted under controlled experimental conditions (298–773 K and 0.001–0.1/s strain rate). Observations on the microstructure of the alloy and tensile test analyses on stress-strain curves both verified that the deformation mechanisms differed drastically at 298–473 K and 573–773 K. Therefore, a temperature-dependent constitutive model was established to characterize the divergent flow behaviors of as-quenched Al-Cu-Mn alloy. In addition, the activation energy,Q, in the model is determined by the combined effect of dislocation forests and precipitate phases, various with different experimental conditions.
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