Positron lifetime study of dislocations in metals

金属位错的正电子寿命研究

• 批准号: 02805079
• 负责人: SHIRAI Y.
• 金额: $ 1.09万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02805079/
• 关键词: Positron Annihilation; Dislocations; Burgers Vector; 積層欠陥エネルギ-; 金属間化合物

Positron lifetime measurements have been performed on some fcc metals and alloys, which were treated to be in such specific conditions that only a given type of dislocations are predominantly contained. The results show that the positron lifetime increases monotonously with the magnitude of Burgers vectors of dislocations. When dislocations are actually extended, the observed positron lifetime comes from partial dislocations and is remarkably shorter than that at undissociated dislocations. Present results not only demonstrate that positron annihilation parameters observed predominantly come from dislocation lines themselves but also show that positron lifetime spectroscopy can be used to differentiate between different types of dislocations.

对某些fcc金属和合金进行了正电子寿命测量，这些金属和合金被处理在这样的特定条件下，只有一种特定类型的位错主要包含。结果表明，正电子寿命随位错的Burgers矢量的大小单调增加。当位错实际扩展时，观察到的正电子寿命来自部分位错，并且明显短于未解离位错。目前的结果不仅表明观测到的正电子湮灭参数主要来自位错线本身，而且表明正电子寿命谱可以用来区分不同类型的位错。

项目成果

Y. Shirai, K. Matsumoto, G. Kawaguchi and M. Yamaguchi: "Systematic change in positron lifetime with the magnitude of Burgers vectors of dislocations in metals" J. Materials Science Forum. (1992)

Y. Shirai、K. Matsumoto、G. Kawaguchi 和 M. Yamaguchi：“正电子寿命随金属位错伯格斯矢量大小的系统变化”J. 材料科学论坛。

Y.Shirai: "Systematic change in positron lifetime with the magunitude of Burgers vectors of dislocations in metals" J.Materials Science Form. (1992)

Y.Shirai：“正电子寿命随金属位错伯格斯矢量的大小而发生系统变化”J.Materials Science Form。

Y.Shirai: "Systematic Change in Positron Lifetime with the Magnitude of Burgers Vectors of Dislocations in Metals" Materials Science Forum. (1992)

Y.Shirai：“正电子寿命随金属位错伯格矢量大小的系统变化”材料科学论坛。

Y.Shirai: "Lattice defects in intermetallic compound TiAl studied by positron lifetime spectroscopy" J.Materials Science Form. (1992)

Y.Shirai：“通过正电子寿命光谱研究金属间化合物 TiAl 中的晶格缺陷”J.Materials Science Form。

Y. Shirai and M. Yamaguchi: "Studies of vacancies and dislocations in TiAl by positron annihilation" J. Mater. Sci. Engineering A. (1992)

Y. Shirai 和 M. Yamaguchi：“通过正电子湮灭对 TiAl 中的空位和位错进行研究”J. Mater。