典型文献
On the superplastic deformation mechanisms of near-α TNW700 titanium alloy
文献摘要：
The new near-α TNW700 titanium alloy is a potential candidate material for high performance ultra-sonic/hypersonic aircrafts,which is designed for short-term service at 700℃.This study systematically investigated the superplastic deformation microstructure evolution and mechanism of TNW700 alloy at different strain rates and true strains at 925℃.Results show that TNW700 alloy exhibits excellent super-plastic behavior in a constant strain rate range of 0.0005-0.005 s-1 with elongation above 400％.The peak stress decreases with decreasing strain rate,which is related to the increase ofβ-phase volume fraction caused by the increase of thermal exposure time.In addition,significant strain hardening is observed in early-middle stage of superplastic deformation,and flow softening is followed in middle-late stage.To ra-tionalize these complex flow behaviors,electron backscatter diffraction(EBSD)and high resolution trans-mission electron microscopy(HRTEM)were used to characterize the microstructure.Strain hardening is correlated to the synergistic effect ofβ grain growth,dislocation accumulation,silicide precipitate,and solid solution strengthening of α phase.Continuous dynamic recrystallization(CDRX)induced the frag-mentation of primary α grains in middle-late stage of superplastic deformation,and the refinement of αgrains,the increase of β phase volume fraction and dynamic dislocation recovery are main causes of high strain softening.In addition,EBSD and TEM observations confirmed texture randomization,fine equiaxed primary α grains and intragranular dislocation movement,indicating that grain boundary sliding(GBS)accommodated by dislocation sliding/climb is the dominant superplastic deformation mechanism of TNW700 alloy.
文献关键词：
中图分类号：
作者姓名：
Lixia Ma;Min Wan;Weidong Li;Jie Shao;Xiaoning Han;Jichun Zhang
作者机构：
School of Mechanical Engineering and Automation,Beihang University,Beijing 100191,China;AVIC Manufacturing Technology Institute,Beijing 100024,China
文献出处：
引用格式：
[1]Lixia Ma;Min Wan;Weidong Li;Jie Shao;Xiaoning Han;Jichun Zhang-.On the superplastic deformation mechanisms of near-α TNW700 titanium alloy)[J].材料科学技术（英文版）,2022(13):173-185
A类：
TNW700,tionalize
B类：
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AB值：
0.520076
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