Grain Size Effects in Nanocrystalline Shape Memory Alloys
Rajeev Ahluwalia (IHPC), SiuSin Quek (IHPC), David Wu (IHPC)
Mechanics of Phase Transforming and Multifunctional Materials
Wed 10:45 - 12:15
CIT 219
The grain size dependence of stress-strain response of nanocrystalline shape memory alloys is studied within the framework of the Ginzburg-Landau (GL) theory. A GL model for a square to rectangle transformation in polycrystals is extended to account for grain boundary effects. Stress-Strain behavior is simulated for different grain sizes in the shape memory as well as psuedoelastic regime.It is demonstrated that non transforming grain boundaries in nanocrystalline shape memory alloys can significantly alter the effective mechanical response of these materials and are crucial to explain the experimentally observed size effects in nanocrystalline shape memory materials.