We have studied the stability of Ni(1-x)-Alxsolid solutions at different stoichiometries (x = 0 25 and x = 0 5) via molecular dynamics simulations of models based on an n-body potential. The face-centred-cubic solid solution with x = 0 25 is stable at room temperature against the ordering transformation which occurs at T = 360°C via the activation of vacancy diffusion with a release of a disordering enthalpy of 8 kJ (g-atom)-1. The results obtained from the simulated model show an intrinsic instability of the x = 0 5 solid solution which is consistent with experimental results that have revealed the direct formation of NiAl (B2) intermetallic phase accompanied by a considerable heat release. © 1993 Taylor & Francis Group, LLC.
|Titolo:||Phase stability of Ni-Al solid solutions|
|Data di pubblicazione:||1993|
|Appare nelle tipologie:||1.1 Articolo in rivista|