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首页> 外文期刊>Materials Science and Engineering >Compression-creep response of magnesium alloy DieMag422 containing barium compared with the commercial creep-resistant alloys AE42 and MRI230D
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Compression-creep response of magnesium alloy DieMag422 containing barium compared with the commercial creep-resistant alloys AE42 and MRI230D

机译：与商用抗蠕变合金AE42和MRI230D相比，含钡的镁合金DieMag422的压缩蠕变响应

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摘要

The development of creep-resistant magnesium alloys that avoid the use of rare-earth alloying elements is an important area of research. The creep response of Mg-Al-Ca alloy containing barium (DieMag422) was compared to that of commercially available creep resistant magnesium alloys AE42 and MRI230D. The creep tests were performed between 175 ℃ and 240 ℃ at stresses between 60 MPa and 120 MPa. From the temperature and stress dependence of the minimum creep rate, the apparent activation energy Q_c and the stress exponent n for creep were calculated. The concept of a threshold stress was applied. True stress exponents n_t close to 5 were calculated. Microstructural investigations and phase analysis were performed on the as-cast materials as well as after creep. Fine precipitates could be identified that justified application of the concept of threshold stress. The DieMag422 alloy shows an improvement in creep resistance at low stresses compared with the other two alloys AE42 and MRI230D.
机译：避免使用稀土合金元素的抗蠕变镁合金的开发是重要的研究领域。将含钡的Mg-Al-Ca合金（DieMag422）的蠕变响应与市售的抗蠕变镁合金AE42和MRI230D的蠕变响应进行了比较。蠕变测试在175℃至240℃之间，应力在60 MPa至120 MPa之间进行。根据最小蠕变速率的温度和应力依赖性，计算了表观活化能Q_c和蠕变应力指数n。应用阈值应力的概念。计算出接近5的真实应力指数n_t。对铸态材料以及蠕变后的材料进行了微结构研究和相分析。可以识别出细微的沉淀物，这可以合理地应用阈值应力的概念。与其他两种合金AE42和MRI230D相比，DieMag422合金在低应力下显示出抗蠕变性的提高。

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  • 来源
    《Materials Science and Engineering》 |2013年第15期|430-438|共9页
  • 作者

    Hajo Dieringa; Yuanding Huang; Philipp Wittke; Martin Klein; Frank Walther; Martina Dikovits; Cecilia Poletti;

  • 作者单位

    Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research, MagIC-Magnesium Innovation Centre, Institute for Material Research, Max-Planck-Strasse 1, 21502 Geesthacht, Germany;

    Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research, MagIC-Magnesium Innovation Centre, Institute for Material Research, Max-Planck-Strasse 1, 21502 Geesthacht, Germany;

    TU Dortmund, Faculty of Mechanical Engineering, Department of Materials Test Engineering (WPT), Leonhard-Euler-Strasse 5, 44227 Dortmund, Germany;

    TU Dortmund, Faculty of Mechanical Engineering, Department of Materials Test Engineering (WPT), Leonhard-Euler-Strasse 5, 44227 Dortmund, Germany;

    TU Dortmund, Faculty of Mechanical Engineering, Department of Materials Test Engineering (WPT), Leonhard-Euler-Strasse 5, 44227 Dortmund, Germany;

    Graz University of Technology, Institute for Materials Science and Welding, Kopemikusgasse 24/I, 8010 Graz, Austria;

    Graz University of Technology, Institute for Materials Science and Welding, Kopemikusgasse 24/I, 8010 Graz, Austria;

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  • 正文语种 eng
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  • 关键词

    Compression creep; Magnesium alloys; Barium; AE42; MRI230D; Threshold stress;

    机译：压缩蠕变;镁合金;钡;AE42;MRI230D;门槛压力;

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