Multiple Deformation Mechanisms in Adiabatic Shear Bands of a Titanium Alloy during High Strain Rate Deformation
Xinran Guan,
Dongrong Liu,
Shoujiang Qu,
Guojian Cao,
Hao Wang,
Aihan Feng,
Daolun Chen
Affiliations
Xinran Guan
School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150040, China
Dongrong Liu
School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150040, China
Shoujiang Qu
School of Materials Science and Engineering, Tongji University, Shanghai 201804, China
Guojian Cao
Key Laboratory for Light-Weight Materials, Nanjing Tech University, Nanjing 210009, China
Hao Wang
Interdisciplinary Center for Additive Manufacturing, School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China
Aihan Feng
School of Materials Science and Engineering, Tongji University, Shanghai 201804, China
Daolun Chen
Department of Mechanical, Industrial and Mechatronics Engineering, Toronto Metropolitan University, Toronto, ON M5B 2K3, Canada
The occurrence of adiabatic shear bands, as an instability phenomenon, is viewed as a precursor to failure caused by instability at high strain rates. Metastable β titanium alloys are extensively utilized due to their excellent mechanical properties, which are often subjected to high strain rate loads in service conditions. Understanding and studying their adiabatic shear instability behavior is thus crucial for preventing catastrophic failure and enhancing material performance. In this study via detailed microstructural analyses in the adiabatic shear region of a Ti-10V-2Fe-3Al alloy subjected to high strain rates, it was observed that α″ martensitic transformation and nano-twinning plus β-to-α phase transformation with α″ martensite as an intermediate phase occurred, in addition to substantial fine grains. The grain refinement mechanisms were mainly related to dynamic recovery dominated by dislocation migration alongside severe plastic deformation.
