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在深低温到室温不同温度下，测量了不同时效状态的Ａｌ-Ｌｉ-Ｃｕ-Ｍｇ-Ｚｒ合金和含Ｚｎ、Ａｇ或Ｓｃ的合金的正电子寿命谱。分析表明：峰值时效使热空位大量回复并使基体电子密度提高。在深低温下，空位主要以单空位形式存在且随温度升高而激活并运动复合成多空位。Ｚｎ和Ａｇ对空位的运动有束缚作用，Ｓｃ有助于空位的运动。样品在低温下基体电子密度升高，对合金低温强度产生重要影响。
The positron lifetime spectra of Al-Li-Cu-Mg-Zr alloys and Zn, Ag or Sc alloys with different aging states were measured at different temperatures from room temperature to room temperature. The analysis shows that: the peak aging makes a large number of hot vacancy and make the matrix electron density increased. At cryogenic temperatures, vacancies predominate as single vacancies and are activated with increasing temperature and recombine into multiple vacancies. Zn and Ag have a binding effect on the vacancy movement, and Sc contributes to the vacancy movement. The electron density of the matrix increases at low temperature, which has an important effect on the low temperature strength of the alloy.