低温下含Zn，Ag或Sc的8090合金正电子寿命谱分析  

POSITRON ANNIHILATION LIFETIME ANALYSIS OF 8090 ALLOY WITH DOPING Zn, Ag OR Sc UNDER CRYOGENIC TEMPERATURES

作　　者：高英俊[1] 吴伟明[1] 冯冠之[1] 许少杰[1] 阮向东[1] 

机构地区：[1]广西大学

出　　处：《金属学报》1995年第2期B091-B096,共6页Acta Metallurgica Sinica

摘　　要：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.

关 键 词：正电子湮没 寿命谱 铝锂合金 锆 银 钪 

分 类 号：TG146.21[一般工业技术—材料科学与工程]