Phase Transformations in Ferromagnetic NiMnGa Shape Memory Films

MAGNETOELASTIC COUPLING IN NiMnGa FERROMAGNETIC SHAPE MEMORY ALLOY

Title of Document: MAGNETOELASTIC COUPLING IN NiMnGa FERROMAGNETIC SHAPE MEMORY ALLOY Peng Zhao, Doctor of Philosophy, 2006 Directed By: Professor, Manfred Wuttig, Department of Materials Science and Engineering NiMnGa alloys have attracted extensive attention because their ferromagnetic characteristic provides an additional degree of freedom to control both the shape memory effect and the mult...

Shape memory and ferromagnetic shape memory effects in single-crystal Ni2MnGa thin films

Magnetic Properties and Structural Phase Transformations of NiMnGa Alloys

The magnetic properties and structural phase transformations of Heusler alloys Ni2+ Mn1 Ga and Ni2 Mn1+ 2Ga1+ 2 were investigated. It was found that the martensitic transformation temperature increases and the Curie temperature decreases with decreasing Mn concentration in the Ni2+ Mn1 Ga system, but the magnetic properties decrease faster than those do in the Ni2 Mn1+ 2Ga1+ 2 system. It sugges...

Finite Element Modelling and Simulation of Phase Transformations in Shape Memory Alloy Thin Films

A unified variational framework and finite element simulations of phase transformation dynamics in a shape memory alloy thin film are reported in this paper. The computational model is based on an approach, which combines the lattice based kinetics involving the order variables and nonequilibrium thermodynamics. Algorithmic and computational issues are discussed. Numerical results on phase nucl...

Numerical Simulation of Phase Transformations in Shape Memory Alloy Thin Films

A unified variational framework and finite element simulations of phase transformation dynamics in shape memory alloy thin films are reported in this paper. The computational model is based on an approach which combines the lattice based kinetics involving the order variables and non-equilibrium thermodynamics. Algorithmic and computational issues are discussed. Numerical results on phase nucle...