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基于真实组织图像建立了Ti-6A1-4V合金的微观力学有限元模型,考虑双相特征研究了合金的微观变形行为.结果 表明:外部加载力主要由较硬的β转变组织承担,而塑性变形主要由较软的初生α相承担.随宏观应变增大,初生α相与β转变组织的应变比、β转变组织与初生α相应力比首先基本保持不变,而后迅速增大,最后保持稳定.初生α相的体积分数和晶粒尺寸对组成相内部的应变和应力分布有影响,随体积分数增大或晶粒尺寸减小,应变比和应力比分别增大和减小.“,”A micromechanics finite element (FE) model was established based on the actual microstructure of Ti-6Al-4V alloy.And considering the dual-phase characteristic,the micro-deformation behavior was studied.The results show that the hard transformed β matrix (βt) bears most external loading force,while the external load deformation is mainly carried out by the soft primary α phase (αp).With the increase of macro strain,the strain ratio of αp to βt and the stress ratio of βt to αp are basically unchanged at first,then increase rapidly,and finally remain stable.The volume fraction (fα) and grain size (dα) of αp have an effect on strain and stress distribution in the phases.With the increase offα or the decrease of dα,the strain ratio and stress ratio increase and decrease,respectively.