In:
Journal of Materials Research, Springer Science and Business Media LLC, Vol. 28, No. 14 ( 2013-07-28), p. 1891-1902
Abstract:
Solidification of undercooled Ni–3.3 wt% B alloy melt was investigated by glass fluxing. If Δ T e 〈 140 ± 10 K, two recalescences appear, indicating that stable eutectic reaction occurs; if Δ 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 Δ T p ; the interface of eutectic solidification changes from many small “dendrites” to a single large one with increasing Δ T e ; the interface of residual liquid solidification changes from many small rings to a single large one with increasing Δ 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.
Type of Medium:
Online Resource
ISSN:
0884-2914
,
2044-5326
DOI:
10.1557/jmr.2013.165
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2013
detail.hit.zdb_id:
54876-5
detail.hit.zdb_id:
2015297-8
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