TC4-DT合金应变诱发最大m值超塑性变形研究  

Superplastic Deformation Based on Strain-induced and maximal m Value in TC4-DT Titanium Alloy

作　　者：喻淼真[1] 王高潮[1] 郑漫庆[1] 徐雪峰[1] 

机构地区：[1]南昌航空大学航空制造工程学院,南昌330063

出　　处：《航空材料学报》2014年第3期15-20,共6页Journal of Aeronautical Materials

基　　金：国家自然科学基金资助项目(51075196);江西省教育厅基金(GJJ12451)

摘　　要：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 characteristics of TC4-DT titanium alloy were investigated at 850 -900℃ and Pre-stain of 1.0 - 2.0 by the method of strain-induced superplastic deformation based on the maximal m value method. Then the optimum process pa- rameters were determined. The results show that the elongations of the alloy increase and then decrease with the increasing of the de- formation temperature under the same pre-stain. The elongations of the alloy increase and then decreased with the increasing of the pre- stain at the same temperature. Dynamic recrystallization obviously occurred in the alloys superplastic deformation. The main deformation mechanism of strain-induced superplasticity deformation based on maximal m value is grain boundary sliding and the anxiliary mecha- nism of deformation is dynamic recovery and recrystallization. The best process parameters of the strain-induced superplastic deforma- tion were the deformation temperature of 870℃ and pre-strain of 1.5. and the elongation ratio could reach 1033%

关 键 词：TC4-DT钛合金 应变诱发 最大m值超塑性 预应变 动态再结晶 

分 类 号：TG146.2[一般工业技术—材料科学与工程]