Effect of the Boron Addition on the structure of the Ni-Mn-Co-In alloys

Abstract

Series of Ni45:5􀀀xCo4:5Mn36:6In13:4Bx (at.%, x = 0, 0.05, 0.1, 0.5, 1.0) polycrystalline magnetic shape memory alloys produced by the induction melting were examined in terms of the structure and transition temperatures. The structure of the alloys was determined by the X–ray diffraction and transmission electron microscopy. Scanning electron microscopy and electron backscattering diffraction techniques were applied to obtain the microstructure and texture of alloys. Boron addition promotes nucleation of the second Co–rich and In–poor phase as well as causes decrease of the martensitic transformation temperatures.