Release Time:2019-03-09  Hits:

Indexed by: Journal Papers

Date of Publication: 2015-05-01

Journal: SCIENCE CHINA-MATERIALS

Included Journals: SCIE

Volume: 58

Issue: 5

Page Number: 355-362

ISSN: 2095-8226

Abstract: It was recently known that the compositions of industrial alloy specifications generally satisfy simple composition formulas issued from short-range-order structural units in their basic solid solutions. In present work, Cu-Ni face-centered-cubic alloys were further addressed by introducing the cluster-plus-glue-atom model for the short-range-order structural descriptions. Composition formulas covering only the first twelve and the second six neighbor shells in the face-centered-cubic lattice are proposed, [Cu-Cu-12](Cu, Ni)(6) for the Cu-rich alloys and [Ni-Ni-12]Cu-6 similar to [Ni-Ni-12](Cu5Ni) for Monel alloy, the only Ni-rich alloy specficiation, where the square-bracketed part represents a cuboctahedral cluster. The alloy specification selection is also discussed in terms of valence electron numbers per unit formula. The present work confirms that well-established industrial alloys have simple composition rules that reflect the intrinsic short-range-order local structures in the solid solutions.