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The solid solubilities of 15 common alloying elements added to the Ll_2-type intermetalliccompound Ni_3Si at 900°C have been estimated,and their substitution modes have been de-duced from the direction of solubility lobe of the compound.It is shown that the alloyingbehaviours in Ni_3Si are determined by both size and electronic factors,i.e.,the substitutionmode is governed by electronic configuration and solubility by the both.An interactionparameter is presented to describe quantitatively the influence of electronic configuration onsubstitution mode and the solubility limit can be successfully explained together with atom radius.
The solid solubilities of 15 common alloying elements added to the Ll_2-type intermetallic compound Ni_3Si at 900 ° C have been estimated, and their substitution modes have been de-duced from the direction of solubility lobe of the compound. It is shown that the alloying behavior in Ni_3Si are determined by both size and electronic factors, ie, the substitution mode is governed by electronic configuration and solubility by the both. Ann interaction parameter is presented to describe quantitatively the influence of electronic configuration on deficit mode and the solubility limit can be successfully explained together with atom radius.