Investigation on martensitic transformation behavior, microstructures and mechanical properties of Fe-doped Ni-Mn-In alloys

摘要

Ni-Mn-In alloys are doped by Fe in order to improve the ductility of this intermetallic. The phase transformation behavior, microstructures and mechanical properties of Ni_(50)Mn_(34)In_(16-y)Fe_y (y = 0, 2,3,4, 5,8) alloys are investigated in this paper. The phase transformation temperatures increase with the increase of Fe content, and some second phase particles appear both along the grain boundaries and inside the grains after being doped 5 at.% and 8 at.% Fe. The compressive strength and maximum compressive strain reach up to 1200 MPa and 15.8% for amounts higher than 8 at.% Fe. In addition, the fracture type changes from typical intergranular crack to transgranular crack gradually with the increase of Fe content.