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<p>This study investigates the correlations between the deformation mechanism, microstructural evolution, and mechanical properties of Al 6351 alloy under elevated temperature and strain rates. The isothermal compression tests were performed on the varying strain rates (0.001 s<sup>-1</sup>, 0.01s<sup>-1</sup>, and 0.1s<sup>-1</sup>) and temperatures (150&#xa0;°C, 200&#xa0;°C, 250&#xa0;°C, and 300&#xa0;°C). True stress–strain curves were obtained for various deformation conditions. The flow stress behavior was predicted using different constitutive models such as the Johnson-Cook (JC) and Arrhenius equation (ARR). The JC model was not able to accurately predict the complex deformation behavior in different strain rates and temperatures and offered an average absolute relative error (AARE) of 23.25%. Meanwhile, the ARR model offered a significantly higher prediction capability with an AARE of 8.46%. These constitutive models were further utilized to create processing maps in different strains, which can provide insights into the optimal deformation condition in hot working conditions. Furthermore, the hot compression behavior can be utilized to design components for high-temperature applications. The deformation behavior was further investigated using transmission electron microscopy, which revealed the presence of continuous dynamic recrystallization (CDRX) as the primary deformation mechanism.</p>

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Flow Stress Behavior and Microstructural Evolution of Al 6351 under Varying Strain Rates and Temperatures

  • 期刊论文

  • 发表日期：

    2025年1月24日

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  • Pankaj Rawat,
  • Amit Joshi,
  • Ashutosh Gupta

摘要

This study investigates the correlations between the deformation mechanism, microstructural evolution, and mechanical properties of Al 6351 alloy under elevated temperature and strain rates. The isothermal compression tests were performed on the varying strain rates (0.001 s-1, 0.01s-1, and 0.1s-1) and temperatures (150 °C, 200 °C, 250 °C, and 300 °C). True stress–strain curves were obtained for various deformation conditions. The flow stress behavior was predicted using different constitutive models such as the Johnson-Cook (JC) and Arrhenius equation (ARR). The JC model was not able to accurately predict the complex deformation behavior in different strain rates and temperatures and offered an average absolute relative error (AARE) of 23.25%. Meanwhile, the ARR model offered a significantly higher prediction capability with an AARE of 8.46%. These constitutive models were further utilized to create processing maps in different strains, which can provide insights into the optimal deformation condition in hot working conditions. Furthermore, the hot compression behavior can be utilized to design components for high-temperature applications. The deformation behavior was further investigated using transmission electron microscopy, which revealed the presence of continuous dynamic recrystallization (CDRX) as the primary deformation mechanism.