Mechanochemical Synthesis and Heating Induced Ordering of Ni–Al–Cr–C Quaternary Solid Solutionsстатья
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Дата последнего поиска статьи во внешних источниках: 19 июля 2013 г.
Аннотация:Nanocrystalline mixed (substitutional/interstitial) solid solutions have been prepared by milling fourcomponent mixtures with the overall compositions (Ni2.8AlCr0.2)C0.5 and (Ni3Al0.8Cr0.2)C0.5. Analysis of Xray diffraction data indicates that the formation of the solid solutions is accompanied by an increase in deformation stacking fault probability, which is directly related to the amount of dissolved carbon. Our resultsdemonstrate that the heatinginduced ordering of the solid solutions occurs in several steps. Nucleation of
the antiperovskite phase E21 occurs through spinodal decomposition of the Ni(Al,Cr,C) solid solution start ing at 400°C. Heating to higher temperatures leads to partial Cr precipitation from the ordered phase and the formation of the chromium carbide Cr3C2, which reduces the carbon content of the antiperovskite phase.