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Study of age hardening in a Mg-2.2 wt%Nd alloy by in situ synchrotron X-ray diffraction and mechanical tests

机译:通过原位同步加速器X射线衍射和力学测试研究Mg-2.2 wt%Nd合金中的时效硬化

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摘要

Microstructure evolution of a supersaturated solid solution Mg-2.2 wt%Nd alloy during aging at 240 ℃ for 6 h (stage Ⅰ), at 295 ℃ for 3 h (stage Ⅱ), and finally at 320 ℃ for 1 h (stage Ⅲ) was studied by in situ synchrotron X-Ray diffraction. In stage Ⅰ, diffraction from β_1 (Mg_3Nd, FCC) precipitates was observed after ~ 15 min. Evolution of the volume, size, and aspect ratio of β_1 with the aging time were estimated from peak intensity and peak width analysis. In stage Ⅱ, diffraction from β (Mg_(12)Nd, tetragonal) precipitates was observed after ~ 36 min while ft remained in the material. In stage Ⅲ, the volume of ft reduced substantially in relative to β. The identified precipitation sequence from the in situ aging experiment is supported by ex situ electron microscopy observations, β', which had not been detected by synchrotron X-rays, was additionally found using transmission electron microscopy in the material by the end of aging stage Ⅰ. Tension and hardness tests using specimens with different aging conditions were further performed to understand how different precipitates affect the strength and ductility of the Mg-Nd alloy.
机译:Mg-2.2 wt%Nd过饱和固溶体Mg-2.2 wt%Nd合金在240℃下老化6h(Ⅰ阶段),295℃下老化3h(Ⅱ阶段),最终在320℃下1h(Ⅲ阶段)时的组织演变。通过原位同步加速器X射线衍射进行了研究。在阶段Ⅰ中,〜15分钟后观察到了来自β_1(Mg_3Nd,FCC)沉淀物的衍射。根据峰强度和峰宽分析,估算了β_1的体积,大小和长宽比随老化时间的变化。在阶段Ⅱ中,〜36分钟后观察到β(Mg_(12)Nd,四方)沉淀的衍射,而ft保留在材料中。在第三阶段,ft的体积相对于β显着减小。原位时效实验确定的沉淀序列得到了异位电子显微镜观察的支持,同步加速器X射线未检测到的β',在时效阶段Ⅰ结束时还通过透射电子显微镜在材料中发现了β'。 。进一步使用具有不同时效条件的样品进行了拉伸和硬度测试,以了解不同的沉淀物如何影响Mg-Nd合金的强度和延展性。

著录项

  • 来源
    《Materials Science and Engineering》 |2017年第21期|319-328|共10页
  • 作者单位

    School of Materials Science and Engineering Shanghai Jiao Tong University, Shanghai 200240, China;

    School of Materials Science and Engineering Shanghai Jiao Tong University, Shanghai 200240, China;

    School of Materials Science and Engineering Shanghai Jiao Tong University, Shanghai 200240, China;

    School of Materials Science and Engineering Shanghai Jiao Tong University, Shanghai 200240, China;

    Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China;

    School of Materials Science and Engineering Shanghai Jiao Tong University, Shanghai 200240, China;

    School of Materials Science and Engineering Shanghai Jiao Tong University, Shanghai 200240, China;

    School of Mechanical Engineering, Qinghai University, Xining 810016, China;

    The State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China;

    The State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Synchrotron X-ray diffraction; Mg alloy; Precipitation; Age-hardening; Tension test;

    机译:同步加速器X射线衍射;镁合金沉淀;时效性拉伸试验;

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