About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Chemistry and Physics of Interfaces
|
| Presentation Title |
Internal strain fields in NiTi from atomistics |
| Author(s) |
Daegun You, Ahmed Sameer Khan Mohammed, Minoru Nishida, Huseyin Sehitoglu |
| On-Site Speaker (Planned) |
Daegun You |
| Abstract Scope |
Martensitic transformations in NiTi involve coupled lattice distortion and atomic shuffling, yet the residual strain fields generated during the sequential B2-R-B19’ pathway remain poorly quantified. Here, we extend the Regularized Green’s function method (RGFM) to obtain spatially resolved transformation-induced strain fields from atomistically informed displacement fields. The approach is applied to the B2-R and R-B19’ transformations and further generalized to self-accommodated martensitic morphologies containing characteristic interfaces and Type I-Type II twin junctions. In contrast to conventional inclusion-based or homogeneous-eigenstrain descriptions, the RGFM retains local structural heterogeneity and anisotropic elastic interactions among transformation variants. The analysis examines how atomic shuffling, interfacial compatibility, and variant arrangement govern strain localization across increasingly complex morphologies. This framework establishes a route for connecting nanoscale residual-strain hotspots with defect nucleation, transformation reversibility, and functional fatigue in NiTi shape memory alloys. |
| Proceedings Inclusion? |
Planned: |