About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Materials Design and Processing Optimization for Advanced Manufacturing: From Fundamentals to Application
|
Presentation Title |
Deformation Pathways in an Engineered Ti Alloy Duplex Microstructure Produced Using Selective Laser Melting |
Author(s) |
Jenniffer Bustillos, Atieh Moridi |
On-Site Speaker (Planned) |
Atieh Moridi |
Abstract Scope |
Achieving an optimal balance of high strength and plasticity in additive manufactured (AM) Ti alloys is a challenge to this day. This study moves away from the established intuition that lack of fusion defects should be avoided in AM of Ti6Al4V. Through a single hot isostatic pressing treatment and the deliberately introduced lack of fusion defects, we demonstrate the ability to engineer a duplex microstructure with excellent combinations of strength (UTS=1.06±0.02GPa) and ductility (εf=20±1%). We reveal a microstructure of α-laths and low aspect ratio α-grains derived from surface energy reduction and recrystallization processes intensified in the presence of fusion defects. Using an adaptive domain misorientation approach of electron backscattered diffraction, we resolve the heterogenous distribution of strains in the duplex microstructure in the form of complex dislocation cells, and sub-grains enabling an added pathway of deformation via their ease of rotation. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Titanium, Mechanical Properties |