Phase stability of Ni-Al solid solutions

V. Rosato, F. Cardellini, F. Cleri

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Abstract

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.
Original languageEnglish
Pages (from-to)845 - 851
Number of pages7
JournalPhilosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties
Volume68
Issue number6
DOIs
Publication statusPublished - 1993
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Chemical Engineering(all)

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