About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
|
Symposium
|
Heterostructured and Gradient Materials (HGM VI): Principle, Processing and Properties
|
Presentation Title |
Harnessing Plastic Instability for Work Hardening in a Heterostructured Multi-Principal Element Alloy |
Author(s) |
Xiaolei Wu |
On-Site Speaker (Planned) |
Xiaolei Wu |
Abstract Scope |
Here, we propose that the premature necking can be harnessed for work hardening in a multi-principal element VCoNi alloy. The Lüders banding as an initial tensile response induces the ongoing localized necking at the band front to produce both triaxial stress and strain gradient that enables the dislocation rapid multiplication. This will lead to the forest dislocation hardening, plus an extra work hardening due to the interaction of dislocations with the local chemical order regions. The dual work hardening combines to restrain and stabilize the premature necking in reverse and to facilitate uniform deformation. Consequently, a superior strength-and-ductility synergy is achieved of ductility of ~20% and yield strength of 2 GPa during room and cryogenic deformation. These findings offer an instability-control paradigm for the synergistic work hardening to conquer the strength-ductility paradox at ultrahigh yield strengths. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, High-Entropy Alloys, |