研究了含Ｔｉ２５％的Ｌ１２结构Ａｌ３Ｔｉ基合金在铸态和经１０００℃进行压缩变形后的微观组织结构变化。试验结果表明，铸态合金中就有Ａｌ２ＴｉＩ相存在。经１０００℃进行压缩变形后合金中Ａｌ２Ｔｉ细片层开始逐渐粗化，其粗化方式有两种：其一是Ａｌ２Ｔｉ片层通过消耗周围细小的Ａｌ２Ｔｉ片层而长大；其二是在再结晶晶界处位错发射导致较粗大Ａｌ２Ｔｉ片层的形成。同时出现Ａｌ２ＴｉⅢ结构。在粗大Ａｌ２Ｔｉ片层的区域Ｒ（ＬＡｌ２Ｔｉ）中容易形成裂纹。 The microstructure changes of Al3Ti-based alloy containing 25% Ti12 structure Al12Ti based alloy after as-cast and compression-deformation at 1000 ℃ were investigated. The experimental results show that Al2TiI phase exists in as-cast alloy. The Al2Ti thin layer in the alloy begins to be coarsened after being compressed and deformed at 1000 ° C. There are two kinds of coarsening methods: one is that the Al2Ti layer grows by consuming the surrounding thin Al2Ti sheet; the other is that after the recrystallization Dislocation at grain boundaries results in the formation of coarser Al2Ti sheets. At the same time Al2Ti Ⅲ structure. Cracks tend to form in the region R (L-Al2Ti) of the coarse Al2Ti sheet.