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首页> 外文期刊>Journal of Materials Research >Positron lifetime and Doppler broadening study of defects in hydrogen charged Al-Mg alloys
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Positron lifetime and Doppler broadening study of defects in hydrogen charged Al-Mg alloys

机译：含氢铝镁合金中缺陷的正电子寿命和多普勒展宽研究

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摘要

The results of positron lifetime and Doppler broadening spectrum of defects in the hydrogen charged non-heat treatable 5xxx Al alloys are presented in this work. The yield stress of the sample was reduced for about 20 Mpa after hydrogen was charged. A similar trend was observed in positron lifetime measurement, as the average lifetime τ_av descended remarkably to almost the level of Al matrix. The change in coincidence Doppler broadening (CDB) spectroscopy was also significant, exhibited by the characteristic change in CDB radio curves of a sample before and after hydrogen was charged. After hydrogen charging, there is an obvious enhancement in the high momentum region compensating dehancement in the low momentum region. This indicates the existence of hydrogen filling effect. The vacancies around the Mg atoms should be preferential filling sites for hydrogen because Mg has a strong affinity for hydrogen. The formation of an Mg-H bond parallel to a grain boundary is an important factor in weakening the grain boundary cohesion.
机译：这项工作介绍了带氢的不可热处理5xxx铝合金中的正电子寿命和多普勒展宽谱的结果。充氢后，样品的屈服应力降低了约20 Mpa。在正电子寿命测量中观察到了类似的趋势，因为平均寿命τ_av显着下降至几乎与Al基体水平相同。重合多普勒增宽（CDB）光谱学的变化也很明显，表现为在充氢之前和之后样品的CDB放射性曲线的特征变化。充氢后，高动量区域明显增强，补偿了低动量区域的减薄。这表明存在氢填充作用。 Mg原子周围的空位应该是氢的优先填充位，因为Mg对氢具有很强的亲和力。平行于晶界的Mg-H键的形成是削弱晶界凝聚力的重要因素。

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  • 来源
    《Journal of Materials Research》 |2009年第5期|1791-1794|共4页
  • 作者

    Xiaowei Wang; Yurong Zhong; Baoyi Wang; Hongyan Zhang;

  • 作者单位

    Shenyang National Laboratory for Materials Science, Institute of Metal Research,Chinese Academy of Sciences, Shenyang 110016, People's Republic of China;

    Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, People's Republic of China;

    Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, People's Republic of China;

    Department of MIME, University of Toledo, Toledo, Ohio 43606;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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