Composition formulas of Cu-Ni industrial alloy specifications

作者：Hong, Hailian; Wang, Qing; Dong, Chuang^*

来源：Science China-Materials, 2015, 58(5): 355-362.

DOI：10.1007/s40843-015-0049-y

• SHORT-RANGE-ORDER
• ELECTRONIC SHELL STRUCTURE
• CLUSTER MODEL
• METALLIC GLASSES
• PRECIPITATION
• BRASS
• ZN
• AL
• TI

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.

• 出版日期2015-5
• 单位大连理工大学; 三明学院