采用基于最大m值法的应变诱发超塑性工艺，研究了TC4钛合金在850～950℃和预应变量为1．2～2．0时的超塑性变形特征，以确定其最佳工艺参数。结果表明：在预应变量相同的条件下，随着温度的升高，合金的伸长率下降；超塑性变形后其内部发生了明显的动态再结晶，温度越高，晶粒越粗大；最佳的工艺参数为变形温度850℃和预应变量1．5，可获得2147％的伸长率。
The superplastic deformation characteristics of TC4 titanium alloy were investigated within temperature of 850--950 ℃ and pre-strain of 1. 2--2.0 by the method of strain-induced superplastic deformation based on the maximum rn value method. Then the optimum process parameters were determined. The results show that the elongation of the alloy decreased with the increase of the deformation temperature under the same pre-stain. Dynamic recrystallization obviously occurred in the alloys after superplastic deformation, the higher of the deformation temperature, the coarser the grains were. The best process parameters of the strain-induced superplastic deformation were the deformation temperature of 850 ℃ and pre-strain of 1.5, and the elongation ratio could reach 2 147%.
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