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首页> 外文期刊>Journal of Materials Science >Effect of twins and non-basal planes activated by equal channel angular rolling process on properties of AZ31 magnesium alloy
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Effect of twins and non-basal planes activated by equal channel angular rolling process on properties of AZ31 magnesium alloy

机译：等通道转角轧制活化孪晶和非基面对AZ31镁合金性能的影响

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摘要

Ultrafine-grained (UFG) metallic materials because of their superior properties have received considerable research interest. Recently, severe plastic deformation (SPD) processes are widely used for refining the grain size in magnesium alloys. Equal channel angular rolling (ECAR) is a SPD process based on equal channel angular pressing (ECAP) which is carried out on large, thin sheets. After doing this process, no significant change is occurred in cross-sectional area of specimen. In this research, an AZ31 magnesium alloy was subjected to ECAR. After completing eight passes of process, significant grain refinement was occurred, and the average grain size of about 3.9 μm was achieved. The distribution of grain size becomes more limited by increasing number of passes. Rotation of basal plane and activation of non-basal and twin planes were clearly observed in X-ray diffraction (XRD) pattern results. Mechanical properties were studied via tensile and hardness tests at room temperature. Tension tests indicated that better ductility due to the rotation of basal plane was achieved. Elongation-to-failure was increased from 8% of as-received material to 19% after two passes of process. Hardness values showed an increase of about 53% at eighth pass.
机译：超细颗粒（UFG）金属材料由于其优越的性能而受到了广泛的研究兴趣。最近，严重的塑性变形（SPD）工艺已广泛用于改善镁合金的晶粒尺寸。等通道角轧制（ECAR）是基于等通道角压制（ECAP）的SPD工艺，该工艺在大而薄的板材上进行。完成此过程后，样品的横截面积没有明显变化。在这项研究中，对AZ31镁合金进行了ECAR处理。完成八道工序后，晶粒发生了明显的细化，平均晶粒尺寸达到了3.9μm。晶粒尺寸的分布受到通过次数增加的限制。在X射线衍射（XRD）模式结果中清楚地观察到了基面的旋转以及非基面和双晶面的激活。通过在室温下的拉伸和硬度测试研究了机械性能。拉伸试验表明，由于基面的旋转，延展性更好。经过两次加工后，断裂伸长率从原样的8％提高到19％。第八次硬度值显示增加约53％。

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  • 来源
    《Journal of Materials Science》 |2011年第24期|p.7689-7695|共7页
  • 作者

    F. Z. Hassani; M. Ketabchi; M. T. Hassani;

  • 作者单位

    Mining and Metallurgical Engineering Department, Amirkabir University of Technology, Hafez Street, Enghelab Avenue, Tehran, Iran;

    Mining and Metallurgical Engineering Department, Amirkabir University of Technology, Hafez Street, Enghelab Avenue, Tehran, Iran;

    Mining and Metallurgical Engineering Department, Amirkabir University of Technology, Hafez Street, Enghelab Avenue, Tehran, Iran;

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