| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Interfaces and Phase Transformations
|
| Presentation Title |
Localized Phase Transformation at Interfaces – A New Alloy Design Strategy |
| Author(s) |
Longsheng Feng, Ashton Egan, Qianglong Liang, Yipeng Gao, Michael Mills, Yunzhi Wang |
| On-Site Speaker (Planned) |
Yunzhi Wang |
| Abstract Scope |
Homophase and heterophase interfaces in materials have been engineered well over a century through various simple and sophisticated processing techniques to achieve special properties. In structural materials, these interfaces have been utilized effectively to regulate dislocation, twinning and cracking activities and hence to control the strengthening and toughening behaviors. In this presentation, however, we will show a different way of utilizing these interfaces in alloy design. In particular, by using a combination CALPHAD, phase transition graph (PTG) and phase-field approaches, we demonstrate how homophase interfaces such as stacking faults and deformation twin boundaries alter phase equilibria and harbor localized phase transformations, which allows one to achieve superior high-temperature work-hardening ability and creep performance in Ni-base superalloys, and ultralow modulus and non-hysteretic and linear superelasticity in NiTi shape memory alloys. This work is supported by NSF/DMREF program and DOE/BES program. |