Microstructures and mechanical properties of Ti5553 alloy processed by high-pressure torsion

6th International Conference on Nanomaterials by Severe Plastic Deformation

材料科学;化学

Jiang, B.Z.^1,2 ; Emura, S.^1 ; Tsuchiya, K.^1,2

Structural Materials Unit, National Institute for Materials Science, Tsukuba, Japan^1

Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Japan^2

关键词: Density of dislocation;    Elongation to failure;    High pressure torsions;    Lattice distortions;    Microstructure and mechanical properties;    Microstructures and mechanical properties;    Ultimate tensile strength;    Ultrafine grained structure;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/63/1/012069/pdf
DOI  :  10.1088/1757-899X/63/1/012069

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In the present research, the effects of high-pressure torsion (HPT) processing on the microstructure and mechanical properties of Ti-5Al-5Mo-5V-3Cr (Ti5553) alloy were studied. HPT processing produced a white etching layer (WEL) in the middle section of the cross-section and numerous shear bands in the surface region of the cross-section. And the thickness of the WEL increased with increasing the HPT revolutions. TEM observation of the WEL revealed an ultrafine-grained structure with high degree of lattice distortions. The mechanical properties measurements showed that the hardness and ultimate tensile strength increased by HPT processing, accompanied with a decrease in the elongation to failure. It is considered that the mechanical properties of HPT processed Ti5553 alloy are mostly dominated by the shear banded region and the WEL where have the finest grain size and high density of dislocations.