| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Multi Scale Modeling of Microstructure Deformation in Material Processing
|
| Presentation Title |
The Formation of Irradiation Induced Defects in NiTi and their Effects on the Martensitic Transformation |
| Author(s) |
Taiwu Yu, Alejandro Hinojos, Daniel Hong, Peter Anderson, Michael Mills, Yunzhi Wang |
| On-Site Speaker (Planned) |
Taiwu Yu |
| Abstract Scope |
Nanoscale defects can form during irradiation of NiTi shape memory alloys. These defects, which include amorphous phases, dislocation loops and nano-voids, can produce special characteristics such as a linearlized response during stress-induced MT, with no distinct plateau, as well as other distinct superelastic behavior. In this work, we simulate the nucleation and growth of irradiation induced defects by a phase field model. Then we show how MTs can be tailored at different conditions of irradiation doses using the phase field method. The results indicate that the size, number density and distribution of the nano-size defects have significant impact on the behavior of the MT and tune the overall MT kinetics from a typical first-order transition into a higher-order continuous transition. Such a unique MT characteristic reduces or even eliminates the transformation hysteresis and produces quasi-linear elasticity with ultra-low apparent elastic modulus. |