【摘要】 分析了Li加入Al-Mg-Si体系后相的析出和组织变化，计算了几个典型的相图截面，并对三种典型合金进行了TEM观测验证．相图计算表明．Li加入Ai－Mg－Si体系后，在平衡状态下，δ为主要析出相，还形成富Si相AlLiSi和Mg2Si；在非平衡的实际析出状态下，亚稳相δ＇成为主要拆出相.δ＇相的析出抑制Mg2Si的形成，增加Mg含量可在一定程度上促进Mg2Si的析出.更多还原

【Abstract】 The effect of Li addition on the precipitation behavior of Al-Mg-Si alloy has been investigated by means of thermodynamic calculation and TEM observation. The addition of Li changed the precipitation behavior of Al-Mg-Si alloys. At equilibrium condition, δ phase was the predominant precipitate, and AlLiSi. Mg2Si phases precipitated as well. At non-equilibrium aging condition,metastable δ’ phase became the predominant phase. The precipitation of δ’ phase inhibited the formation of Mg2Si phase. Increasing Mg content can promote the precipitation of Mg2Si phase.更多还原