Tracer diffusion in ordered pseudo-binary multicomponent aluminides

Mohan Muralikrishna G., Mayur Vaidya, B.S. Murty, Sergiy V. Divinski, Gerhard Wilde

Abstract

Self-diffusion in ordered pseudo-binary multicomponent aluminides is investigated. Equiatomic substitution of transition metal sublattice in aluminides is performed to produce multicomponent alloys Al(CoNi), Al(FeNi), Al(CoFe), Al(CoFeNi), Al(CoFeMnNi) and Al(CoCuFeMnNi). X-ray diffraction and electron microscopy confirm the presence of single phase ordered BCC structure for all the alloys. Radioactive isotopes of 57Co, 59Fe, 54Mn, 63Ni and 65Zn are used to measure the tracer diffusion coefficients in all the alloys at 1273 K. The influence of multi-principal element alloying of the transition metal sublattice on self-diffusion is mapped to its impact on the defect structure in these ordered alloys.