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期刊论文
Phase separation in undercooled Cu-Cr melts
Materials Science and Engineering A 449-451(2007)654-657,-0001,():
Phase separation in undercooled Cu–25 wt.% Cr melts was investigated using the electromagnetic levitation technique in combination withsplat-quenching. The solidification microstructure of the levitated and splat-quenched samples showed many Cr-rich spheres in a Cu-rich matrixin addition to fine Cr-rich dendrites. The Cr-rich dendrites nucleated preferentially on the surface of the Cr-rich spheres, and grew outwards.Such a microstructure shows clear evidence of metastable liquid phase separation in undercooled Cu–Cr melts. In the levitated samples withoutsplat-quenching, however, a dendritic microstructure was observed showing no evidence of liquid phase separation. The results are discussed interms of a newly established phase diagram based on thermodynamic calculations.
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