论文部分内容阅读
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.
The phase precipitation and microstructure changes after Li addition to Al-Mg-Si system were analyzed. Several typical phase diagrams were calculated and three typical alloys were observed by TEM. Phase diagram calculation shows. When Li is added to the system of Ai-Mg-Si, δ is the main precipitated phase and Al-rich Si and Mg2Si are formed in the equilibrium state. In the non-equilibrium actual precipitation state, δ ’becomes the main detachment phase. The precipitation of δ ’phase inhibits the formation of Mg 2 Si and increasing the Mg content can promote the precipitation of Mg 2 Si to a certain extent.