|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Deformation and Transitions at Interfaces
||L-60: Non-uniform Magnetostress in Magnetic Shape-memory Alloys
||Anthony Hobza, Peter Müllner
|On-Site Speaker (Planned)
A magnetic field generates a stress state in a magnetically anisotropic material when the magnetic field is not parallel to the easy axis of magnetization. At interfaces, the orientation of the easy axis changes abruptly and so does the stress state. In general, discontinuities of the stress state violate the mechanical equilibrium conditions resulting in a net force distributed along the grain boundary. In the case of a twin with two parallel twin boundaries, the net forces of the two twin boundaries result in a net torque. We measured this torque by subjecting twinned Ni-Mn-Ga magnetic shape memory alloy single crystals to a magnetic field. The torque increased with increasing magnetic field and with increasing twin width. We discuss implications of the inequilibrium stress for the magneto-mechanics of magnetic shape memory alloys such as fracture and fatigue.