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首页> 外文期刊>Materials Science and Engineering >Precipitation in Mg-Sm binary alloy during isothermal ageing: atomic-scale insights from scanning transmission electron microscopy
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Precipitation in Mg-Sm binary alloy during isothermal ageing: atomic-scale insights from scanning transmission electron microscopy

机译：等温时效过程中Mg-Sm二元合金的析出：扫描透射电子显微镜的原子尺度见解

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摘要

The paper reports on an atomic-scale investigation into the precipitation hardening process in Mg-2.5Sm (wt%) alloy, using advanced Cs-corrected high angle annular dark field - scanning transmission electron microscopy (HAADF-STEM). Various novel precipitate structures existing in different ageing conditions are identified and discussed in depth. In the under-aged sample, three nucleation mechanisms are observed: β_L, β_H and β', which are uniformly-scattered atomic-size rare earth clusters, displaying a significant strengthening effect in a very short ageing time of 30 min. In the peak-aged sample, the main strengthening structures are needle-like precipitates composed of zigzag line repetitive units and hexagonal repetitive units. In the over-aged sample, the needle-like precipitates grow coarse and a subset of the precipitates transform into β_1 precipitates, both of which are detrimental to the mechanical properties. From an engineering perspective, it is of great interest to design advanced Mg-RE materials with the uniformly-scattered atomic-size rare earth clusters, because they are effective strengthening structures requiring short ageing time. In the second place, the paper reveals three types of transformation processes occurring during the precipitation: the transformation between β_L precipitates and needle-like precipitates, the transformation within needle-like precipitates along [0001]_(Mg) and the transformation between needle-like precipitates and β_1 precipitates. The RE atoms remain coherent with the α-Mg matrix before they transform into β_1 precipitates.
机译：本文使用先进的Cs校正大角度环形暗场-扫描透射电子显微镜（HAADF-STEM）对Mg-2.5Sm（wt％）合金中的沉淀硬化过程进行了原子级研究。识别并深入讨论了在不同老化条件下存在的各种新型沉淀物结构。在老化不足的样品中，观察到三种成核机理：β_L，β_H和β'，它们是均匀分散的原子大小的稀土簇，在很短的30分钟老化时间内显示出显着的强化作用。在峰值时效样品中，主要的强化结构是由之字形重复单元和六角形重复单元组成的针状沉淀物。在过时的样品中，针状沉淀物变得粗大，并且一部分沉淀物转变为β_1沉淀物，这两种沉淀物均对机械性能有害。从工程的角度来看，设计具有均匀分散的原子尺寸稀土簇的高级Mg-RE材料非常重要，因为它们是有效的强化结构，需要较短的老化时间。其次，本文揭示了沉淀过程中发生的三种转化过程：β_L沉淀物与针状沉淀物之间的转化，针状沉淀物中沿[0001] _（Mg）的转化以及针状沉淀之间的转化。如沉淀物和β_1沉淀物。 RE原子在转变为β_1沉淀之前，仍与α-Mg基质保持相干。

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  • 来源
    《Materials Science and Engineering》 |2016年第4期|304-311|共8页
  • 作者

    Jingxu Zheng; Weimin Zhou; Bin Chen;

  • 作者单位

    Frontier Research Center for Materials Structure, Shanghai Jiao Tong University, Shanghai, China ,School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, China;

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

    Frontier Research Center for Materials Structure, Shanghai Jiao Tong University, Shanghai, China ,School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, China;

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

    Electron microscopy; Magnesium alloys; Age hardening; Phase; Transformation;

    机译：电子显微镜;镁合金;时效硬化;相;转型;

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