Phase transition and mechanical properties of Ni ₃₀ Cu ₂₀ Mn _{37+ <i>x</i>} Ga _{13− <i>x</i>} ( <i>x</i> = 0–4.5) alloys

Abstract

Abstract Ni 30 Cu 20 Mn 37+ x Ga 13− x ( x = 0–4.5) alloys were studied with the phase transformation and mechanical properties. With the increase of Mn content, the martensitic transformation temperatures increase and the Curie temperature decreases. Simultaneously, the room temperature microstructure evolves from single phase of austenite to dual phases containing martensite and precipitation. Both the ductility and the strength of the polycrystalline alloys are significantly improved by the precipitation. Coupled magnetostructural transition from weak magnetic martensite to ferromagnetic austenite is obtained in both single‐phase and ductile dual‐phase alloys.