在２５—２７５Ｋ范围内，测量了正电子在８０９０合金和含Ｚｎ，Ａｇ或Ｓｃ的８０９０合金的湮没寿命．结果表明，τ１＝１７５—１８７ｐｓ是典型的正电子在共格粒子δ＇（Ａｌ３Ｌｉ）上的湮没寿命；τ２对温度Ｔ有明显的依赖关系．只要同时考虑空位、晶界对τ２的影响，就可以很好地对这四种样品的τ２－Ｔ曲线作出解释，并可对空位的存在形式作出推断．
The positron annihilation lifetime of 8090 alloy and that added Zn, Ag or Sc were measured in the temperature range of 25—273 K. Results showed that the short life component of τ1 = 175—187 ps is a typical positron annihilation lifetime incoherent δ'(Al3Li) phase particles, and the long one τ2 is obviously dependent on temperature.The temperature dependence of τ2 in 4 alloys can be well interpreted and the behaviour of vacancy be deduced as long as the influence of both vacancy and grain boundray on τ2 is considered.Correspondent: GAO Yingjun, lecturer,(Department of Physics, Guangxi University, Nanning 530004)
参考文献
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| [5] | 蒋晓军．博士学位论文,中国科学院金属研究所,19932KirkegardP,EldrupM．ComputPhysCommum,1974 |
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