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Creep of Al-0.2Sc-0.04Zr alloys after different cold-rolling and ageing combinations

机译：不同冷轧和时效组合后的Al-0.2Sc-0.04Zr合金的蠕变

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摘要

The tensile creep of Al-0.2Sc-0.04Zr (wt%) after pre-ageing+cold-rolling+ageing (A+CR+A) and cold-rolling+ageing (CR+A) was comparatively studied in the temperature range from 225 to 300 ℃. The results show that both A+CR+A and CR+A apparently improve the creep resistance. Comparing to A+CR+A, a much higher creep resistance can be obtained by CR+A. The creep threshold stress at 300 ℃ for CR+A is 50 MPa, which is 117% higher than that (23 MPa) for A+CR+A; furthermore, it decreases linearly with increasing temperatures. The creep of Al-0.2Sc-0.04Zr after both treatments can still be attributed to the dislocation creep with the existence of threshold stresses. Nevertheless, the much smaller creep activation energy (0.50-0.67 eV) than that of pure Al may be associated with fine grain sizes and/or pipe diffusion inside grains.
机译：在温度范围内比较研究了预时效+冷轧+时效（A + CR + A）和冷轧+时效（CR + A）之后的Al-0.2Sc-0.04Zr（wt％）的拉伸蠕变225至300℃。结果表明，A + CR + A和CR + A均明显改善了抗蠕变性。与A + CR + A相比，CR + A可获得更高的抗蠕变性。 CR + A在300℃时的蠕变极限应力为50 MPa，比A + CR + A的蠕变极限应力（23 MPa）高117％。此外，它随着温度的升高呈线性下降。两种处理后的Al-0.2Sc-0.04Zr蠕变仍可归因于存在阈值应力的位错蠕变。然而，比纯Al小得多的蠕变活化能（0.50-0.67 eV）可能与细晶粒尺寸和/或晶粒内部的管道扩散有关。

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  • 来源
    《Materials Science and Engineering》 |2014年第6期|148-152|共5页
  • 作者

    W.J. Li; B. Cai; Y.C. Wang; Z.X. Liu; S. Yang;

  • 作者单位

    Key Laboratory of Material Physics, Ministry of Education of China, School of Physical Engineering, Zhengzhou University, Zhengzhou 450001, PR China;

    Key Laboratory of Material Physics, Ministry of Education of China, School of Physical Engineering, Zhengzhou University, Zhengzhou 450001, PR China;

    Key Laboratory of Material Physics, Ministry of Education of China, School of Physical Engineering, Zhengzhou University, Zhengzhou 450001, PR China;

    Key Laboratory of Material Physics, Ministry of Education of China, School of Physical Engineering, Zhengzhou University, Zhengzhou 450001, PR China;

    Key Laboratory of Material Physics, Ministry of Education of China, School of Physical Engineering, Zhengzhou University, Zhengzhou 450001, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Aluminum alloys; Ageing; Cold-rolling; Creep; TEM;

    机译：铝合金;老化;冷轧;蠕变;透射电镜;

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