Liquid structure of undercooled Cu70Ni30 alloy

Experiments of X-ray diffraction for liquid Cu70Ni30 alloy above and below its liquidus (1 230 degreesC) have been carried out. By the analysis of experimental results, it is discovered that difference between structures of liquid and undercooled Cu70Ni30 alloy is their cluster sizes. The correlation radius of cluster is 1.125 nm and the atom number of cluster is 403 at 1 250-1 400 degreesC, and they are 1.3 nm and 704 respectively at the undercooled liquid state (1 200 degreesC). The structure of liquid Cu70Ni30 alloy is fee short order and its solid structure, fee, is kept from liquid fee short order.