Low-temperature superplasticity of cryorolled Ti-6Al-4V titanium alloy sheets  

作　　者：Fei-Long Yu Charlie Kong Hai-Liang Yu 

机构地区：[1]State Key Laboratory of High Performance Complex Manufacturing,Central South University,Changsha,410083,China [2]College of Mechanical and Electrical Engineering,Central South University,Changsha,410083,China [3]Light Alloy Research Institute,Central South University,Changsha,410083,China [4]Mark Wainwright Analytical Centre,University of New South Wales,Sydney,NSW,2052,Australia

出　　处：《Tungsten》2023年第4期522-530,共9页钨科技（英文）

基　　金：financial support from the High-tech Industry Technology Innovation Leading Plan of Hunan Province(Grant No.:2020GK2032);the Research Fund of the Key Laboratory of High-Performance Complex Manufacturing at Central South University。

摘　　要：To investigate the superplastic deformation behavior of cryorolled Ti-6Al-4V titanium alloy,tensile tests were carried out at760℃and 830℃with different strain rate.The evolution of grain and micro structure has been studied using transmission electron microscopy and electron backscatter diffraction.When the tensile temperature was 760℃(<0.5T_(m),T_(m)is absolute melting point of alloy.)and the strain rate was 5×10^(-4)s^(-1),the fracture elongation of the sample reached 385%,showing good low-temperature superplasticity.Compared with the tensile temperature of 760℃,the fracture elongation of the s ample at 830℃was lower due to grain coarsening and oxidation.The strain rate sensitivity value m of all samples was larger than0.3,which confirmed that the cryorolled Ti-6A1-4V titanium alloy with a non-equiaxed grains structure can achieve high superplasticity at a temperature lower than 0.5T_(m),and indicated that the main deformation mechanisms in the tensile test at760-830℃were grain rotation and grain boundary sliding.After the tensile test,the average grain size of all samples was less than 5μm,in which significant dynamic recrystallization and recovery occurred.

关 键 词：Ti-6Al-4V alloy CRYOROLLING Non-equiaxed grains structure SUPERPLASTICITY 

分 类 号：TG335[金属学及工艺—金属压力加工] TG146.23[一般工业技术—材料科学与工程]