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

被引：0

作者：

Fei-Long Yu ^{[1
,2
,3
]}

Charlie Kong ^{[4
]}

Hai-Liang Yu ^{[1
,2
,3
]}

机构：

[1] State Key Laboratory of High Performance Complex Manufacturing ,Central South University

[2] College of Mechanical and Electrical Engineering ,Central South University

[3] Light Alloy Research Institute ,Central South University

[4] Mark Wainwright Analytical Centre ,University of New South Wales

来源：

Tungsten | 2023年 / 04期

关键词：

D O I：

暂无

中图分类号：

TG335 [轧制工艺]; TG146.23 [];

学科分类号：

080201 ; 080502 ; 080503 ;

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℃(<0.5Tm,Tmis absolute melting point of alloy.) and the strain rate was 5 × 10-4s-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 0.5Tm,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 5 μm,in which significant dynamic recrystallization and recovery occurred.

引用

页码：522 / 530

页数：9