Microstructure and mechanical properties of the Dy50(Cu50−xNix) intermetallic B2 CsCl-type compounds

The effects of Ni substitution for Cu in Dy50Cu50 on its structure and mechanical properties were investigated. Dy50Cu45Ni5 was single phase and Dy50Cu40Ni10 contained the B27 structure as a second phase. Transmission electron microscopy showed that the orientation relationship between B2 DyCu(Ni) and B27 DyNi(Cu) phases is (1¯21¯)B2(020)B27. Dy50Cu45Ni5 exhibits a similar tensile ductility as Dy50Cu50 and a higher strength, and a compression ductility somewhat less than Dy50Cu50 with a higher compressive strength. Dy50Cu40Ni10 has little plasticity.