Thermodynamic stability and diffusivity of near-equiatomic Ni–Mn alloys

Ding, Ling; Ladwig, Peter F.; Yan, Xinyan; Chang, Y. Austin
February 2002
Applied Physics Letters;2/18/2002, Vol. 80 Issue 7, p1186
Academic Journal
The equilibrium phase diagram of the nickel-manganese system is determined between 500 and 850°C, in the composition range between 25 and 70 at. % Ni. A combination of electron probe microanalysis, x-ray diffraction, and optical microscopy was employed to analyze 47 samples that were annealed anywhere from three to seven months. The equiatomic, antiferromagnetic, L1[SUB 0]-NiMn phase that is of considerable technological interest was found to exist continuously between 500 and 700°C. No other intermediate phases were found in this study at low temperatures. These results are in contrast to the currently accepted phase diagram published in most handbooks. A hot-isobaric-pressing method was used to initially bond samples that were subsequently used to determine interdiffusion coefficients in the Ni-Mn system at 650°C. The Boltzmann-Matano method [T. Heumann, Z. Phys. Chem. 201, 168 (1952)] allowed the calculation of these interdiffusion coefficients across the α-Mn, β-Mn, ϒ-Mn, L1[SUB 0]-NiMn, and ϒ-Ni phases.


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