Influence of chemical short-range order on atomic diffusion in Al–Ni melts

Das, S. K.; Horbach, J.; Koza, M. M.; Mavila Chatoth, S.; Meyer, A.
January 2005
Applied Physics Letters;1/3/2005, Vol. 86 Issue 1, p011918
Academic Journal
We use inelastic neutron scattering and molecular dynamics simulation to investigate the chemical short-range order (CSRO), visible through prepeaks in the structure factors, and its relation to self-diffusion in Al–Ni melts. As a function of composition at 1795 K, Ni self-diffusion coefficients from experiment and simulation exhibit a nonlinear dependence with a pronounced increase on the Al-rich side. This comes along with a change in CSRO with increasing Al content that is related to a more dense packing of the atoms in Ni-rich Al–Ni systems.


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