Active Slip Mode Analysis of an Additively Manufactured Ti-6Al-4V Alloy via In-Grain Misorientation Axis Distribution
Chen Li,
Jingli Sun,
Aihan Feng,
Hao Wang,
Xiaoyu Zhang,
Chaoqun Zhang,
Fu Zhao,
Guojian Cao,
Shoujiang Qu,
Daolun Chen
Affiliations
Chen Li
School of Materials Science and Engineering, Tongji University, Shanghai 201804, China
Jingli Sun
Research and Development Center, Shanghai Spaceflight Precision Machinery Institute, Shanghai 201600, China
Aihan Feng
School of Materials Science and Engineering, Tongji University, Shanghai 201804, China
Hao Wang
Interdisciplinary Center for Additive Manufacturing, School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 201210, China
Xiaoyu Zhang
Beijing Key Laboratory of Intelligent Space Robotic Systems Technology and Applications, Beijing Institute of Spacecraft System Engineering, China Academy of Space Technology, Beijing 100094, China
Chaoqun Zhang
School of Materials, Sun Yat-sen University, Guangzhou 510275, China
Fu Zhao
Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology, Shenzhen 518055, China
Guojian Cao
Key Laboratory for Light-Weight Materials, Nanjing Tech University, Nanjing 211816, China
Shoujiang Qu
School of Materials Science and Engineering, Tongji University, Shanghai 201804, China
Daolun Chen
Department of Mechanical and Industrial Engineering, Ryerson University, Toronto, ON M5B 2K3, Canada
Selective laser-melted (SLM) Ti-6Al-4V alloy was quasi-statically compressed in the transverse and longitudinal directions at a strain rate of 1 × 10−3 s−1 at room temperature. The twinning, in-grain misorientation axis (IGMA) distribution and active slip modes of individual grains in the deformed SLM Ti-6Al-4V alloy were studied in detail via transmission Kikuchi diffraction (TKD) and transmission electron microscopy (TEM). The α’/α phase was textured with the c-axis oriented either at ~45° or perpendicular to the building direction (BD). A combined analysis of the IGMA distribution and Schmid factor revealed that the prismatic slip or pyramidal slip was easily activated in the soft grains with their c-axes perpendicular to the BD (or the loading direction) in the longitudinal compressed sample, while slip was hardly activated in the transverse compressed sample due to the lack of soft grains. Prismatic slip with IGMA around Taylor axis also occurred in {10–11} twins. The observations revealed that the prismatic slip played a key role in accommodating the external strain and, thus, well explained the anisotropy of mechanical properties in the SLM Ti-6Al-4V alloy.
