Effect of vanadium addition on lattice parameter and distortion of L12-(AlX)3Ti phase

Composition, lattice parameter and lattice distortion of six kinds of quaternary Lit-type (AlX)(3)Ti(V) phases with ternary element X(Mn, Cr, Fe, Ni, Cu or Ag) have been examined by electron micro-probe analysis and X-ray diffraction analysis. Quaternary element, V from 1 to 12 mol% was added to the six kinds of L1(2)-type (AlX)3Ti(V) phases. Measured lattice parameters of Lit-type (AlX)3Ti(V) phases exhibited good linear correlation with calculated lattice parameter from atomic sizes and occupation sites of constitutional atoms in the L1(2)-type (AlX)(3)Ti(V) phases except for the (AlNi)(3)Ti(V) and (AlCu)(3)Ti(V) systems. A large amount of residual strain induced by milling of the specimen into powder was found in the Lit-type (AlMn)(3)Ti(8 mol%V). A large amount of lattice distortion was found in the powder specimen of the Lit-type (AlFe)(3)Ti(8 mol%V) phase which was well annealed at 1223 K for 40 min. It was suggested that the Lit-type (AlX)(3)Ti(V) phase may have poor ductility at ambient temperature if their powder specimen exhibit a large amount of lattice distortion after well annealing.