Zn的存在加快了Al-Li-Cu-Mg-Zr合金的时效硬化速度,明显促进S’相的析出,降低δ’颗粒的长大速度.经过长时间时效后,含Zn合金中将析出含Zn的条状相;根据正电子湮没参数的变化研究了时效过程中Zn对合金的缺陷浓度及基体电子结构的影响.
Effect of Zn on age hardening, microstructure, defects and electronic structurein matrix of Al-Li-Cu-Mg-Zr alloy has been investigated. The addition of Zn to the alloysignincantly influences the precipitation, aging and positron annihilation parameters. TheZn-containing alloys exhibit stronger hardening tendency and higher value of hardness.Moreover, the presence of Zn may delay the growth of δ' particles and stimulate the precipita-tion and uniform distribution of S' phase. After aged for along time, coarse lath-like phasesrich in Zn would precipitate both in matrix and at grain boundaries in the Zn-containing al-loys.
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