Journal
JOURNAL OF MATERIALS RESEARCH
Volume 28, Issue 14, Pages 1891-1902Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1557/jmr.2013.165
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Funding
- China National Funds for Distinguished Young Scientists [51125002]
- National Basic Research Program of China (973 Program) [2011CB610403]
- Natural Science Foundation of China [50901059, 51071127, 51134011]
- 111 project [B08040]
- Fundamental Research Fund of NPU [JC20120223]
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Solidification of undercooled Ni-3.3 wt% B alloy melt was investigated by glass fluxing. If Delta T-e, < 140 +/- 10 K, two recalescences appear, indicating that stable eutectic reaction occurs; if Delta T-e >= 140 +/- 10 K, three recalescences can be observed, indicating that metastable eutectic reaction occurs. Analysis indicates that the phase fractions of the as-solidified structure can be predicted by the recalescence delay times in the cooling curves. High-speed video images show that the solidification interface of primary solidification changes from single dendritic shape to spherical shape with increasing Delta T-p; the interface of eutectic solidification changes from many small dendrites to a single large one with increasing Delta T-e; the interface of residual liquid solidification changes from many small rings to a single large one with increasing Delta T-r. The growth velocity of eutectic solidification suggests a coupled growth at small and moderate undercoolings and decoupled growth at large undercooling, whereas that of residual liquid solidification cannot be interpreted by the available models.
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