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Al-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'成为主要析出相.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.
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