期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 717, 期 -, 页码 190-196出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.04.220
关键词
Peritectic alloy; Monotectic solidification; Phase separation; Dendritic growth; Liquid undercooling
资金
- National Natural Science Foundation of China [51371150, 51327901, 51571163]
Liquid ternary Fe(50-x/2)Cu(50-x/2)Gex (x - 5 and 15) alloys were highly undercooled by glass fluxing technique, and the achieved maximum undercoolings are 300 K (0.18TL) and 268 K (0.16TL), respectively. At small undercoolings, these two alloys solidify in a normal pathway of peritectic solidification. If the alloy undercooling continues to increase beyond a certain value, metastable liquid phase separation takes place. The critical undercooling for Fe47.5Cu47.5Ge5 alloy is 70 K and that for Fe42.5Cu42.5Ge15 alloy is 110 K. At larger undercoolings, the homogeneous liquid alloy separates into an Fe-rich zone and a Cu-rich zone. In such a case, the undercooled alloy displays a monotectic solidification structure. The rapid solidification of the Fe-rich zone is the keystone of alloy solidification, and the growth velocity of the primary phase rises with increasing alloy undercooling according to a power law relation. Within the experimental undercooling ranges, the primary gamma Fe phase of Fe47.5Cu47.5Ge5 alloy attains a maximum growth velocity of 19 m/s, while the growth velocity of the primary Fe0.84Ge0.16 phase reaches 11 m/s in undercooled Fe42.5Cu42.5Ge15 alloy. Moreover, energy dispersive spectroscopy (EDS) analysis shows that the Fe-rich and Cu-rich liquid phases have a similar affinity with solute Ge. (C) 2017 Elsevier B.V. All rights reserved.
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