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采用基于最大m值法的应变诱发超塑性工艺,研究了TC4-DT钛合金在850~900℃和预应变量为1.0~2.0时的超塑性变形行为特征,确定了其最佳工艺参数。结果表明:在预应变量相同的条件下,随着温度的升高,合金的伸长率先增后减,在温度相同的条件下,随着预应变量的增加,合金的伸长率先增后减。超塑性变形后其内部发生了明显的动态再结晶,应变诱发最大m值超塑性的主要变形机制是晶界滑移,动态回复和动态再结晶为变形机制的辅助机制。最佳的工艺参数为变形温度870℃、预应变量1.5,最大伸长率1033%。
The superplastic deformation behavior of TC4-DT titanium alloy at 850-900 ℃ and pre-strain of 1.0-2.0 was studied by using strain-induced superplasticity technique based on maximum m-value method. The optimum technological parameters were determined. The results show that with the same prestrain, the elongation of the alloy increases first and then decreases with the increase of the temperature. Under the same temperature, the elongation of the alloy first increases with the increase of the pre-strain Less. After the superplastic deformation, significant dynamic recrystallization occurs in the interior of the superplastic deformation. The main deformation mechanism of strain-induced maximum m-value superplasticity is grain boundary slip, dynamic recovery and dynamic recrystallization as the auxiliary mechanism of the deformation mechanism. The best process parameters for the deformation temperature of 870 ℃, pre-strain 1.5, the maximum elongation of 1033%.