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首页> 外文期刊>Materials Science and Engineering >Constitutive characteristics and microstructure evolution of 7150 aluminum alloy during isothermal and non-isothermal multistage hot compression
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Constitutive characteristics and microstructure evolution of 7150 aluminum alloy during isothermal and non-isothermal multistage hot compression

机译：7150铝合金等温和非等温多级热压缩过程中的本构特征和组织演变

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摘要

Isothermal and non-isothermal multistage hot compression tests were carried out on 7150 aluminum alloy at temperature range of 325-425 ℃ and strain rate range of 0.01-1 s~(-1). During isothermal multistage hot compression, the flow stress decreased with increasing temperature, accumulative strain as well as decreasing strain rate and pass strain. However, the interval time had a complex influence on flow stress, which ascended flow stress values with increasing interval time at 425 ℃. The isothermal and non-isothermal constitutive characteristics were studied based on hyperbolic-sine law, indicating complex influences of various processing parameters on material constants. Non-isothermal multistage flow stresses were found to be easier than normal continuous single pass method to manipulate for constitutive equations calculation with better linear fitting reference and comparable activation energy. Precipitation at low temperature and its dissolution at high temperature were found to affect flow behavior and constitutive characteristics remarkably based on microstructural observation of deformed sample.
机译：对7150铝合金在325-425℃的温度范围和0.01-1 s〜（-1）的应变速率范围内进行了等温和非等温多级热压缩试验。在等温多级热压缩过程中，流应力随着温度的升高，累积应变以及应变速率和通过应变的降低而减小。但是，间隔时间对流动应力有复杂的影响，在425℃时，间隔时间随着流动应力的增加而升高。根据双曲正弦定律研究了等温和非等温本构特性，表明各种加工参数对材料常数的复杂影响。发现非等温多级流应力比正常的连续单程方法更容易操纵本构方程，具有更好的线性拟合参考和可比较的活化能。基于变形样品的微观结构观察，发现低温下的沉淀及其在高温下的溶解会显着影响流动行为和本构特性。

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  • 来源
    《Materials Science and Engineering》 |2015年第11期|459-469|共11页
  • 作者

    Fulin Jiang; Hui Zhang; Jian Su; Yishan Sun;

  • 作者单位

    College of Materials Science and Engineering, Hunan University, Changsha 410082, China,Department of Materials Science and Engineering, McMaster University, 1280 Main Street West, Hamilton, Ontario, Canada L8S 4L7;

    College of Materials Science and Engineering, Hunan University, Changsha 410082, China,Hunan Province Key Laboratory for Spray Deposition Technology and Application, Hunan University, Changsha 410082, China;

    College of Materials Science and Engineering, Hunan University, Changsha 410082, China;

    College of Materials Science and Engineering, Hunan University, Changsha 410082, China;

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  • 正文语种 eng
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  • 关键词

    Aluminum alloys; Multistage hot compression; Flow stress; Constitutive characteristics; Microstructure;

    机译：铝合金;多级热压缩;流应力本构特征;微观结构;

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