NiTi-based shape memory alloys beyond the shape memory effect and superelasticity

This thesis presents a research on NiTi-based shape memory alloys beyond the conventional knowledge of physical metallurgy of NiTi-based shape memory alloys. In particular, it is concerned with functionally graded NiTi materials achieved via geometrical graded designs, microstructural thermal stability of NiTi-based matrix in-situ nanowire and nanoribbon composite systems, and theoretical analysis using density functional theory (OFT) of the phase stabilities and transformation pathways of binary near equiatomic NiTi alloy and ternary Ti₅₀Ni_50.xCu_x alloy under hydrostatic compression and shear stresses.