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Directional Solidification of (Ti, Zr) Carbide‐(Ti, Zr) Diboride Eutectics
Author(s) -
SORRELL C.C.,
BERATAN H.R.,
BRADT R.C.,
STUBICAN V.S.
Publication year - 1984
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1984.tb19740.x
Subject(s) - materials science , eutectic system , lamellar structure , carbide , microstructure , zirconium diboride , hexagonal crystal system , metallurgy , crystallography , composite material , zirconium , chemistry
Crystallographic and microstructural features of the directionally solidified ZrC‐ZrB 2 , ZrC‐TiB 2 , and TiC‐TiB 2 eutectics were studied. Growth directions were the [011] for the cubic carbide phases and the [01.0] for the hexagonal diborides, yielding an interfacial plane for the lamellar eutectics of (111) cubic parallel to (00.1) hexagonal . The ZrC‐ZrB 2 and TiC‐TiB 2 each exhibited regular lamellar growth, whereas the ZrC‐TiB 2 had a Chinese script‐type of microstructure. A λ 2 R= constant growth law was followed where the constants are (2.57 plusmn; 0.63) × 10 ‐18 m 3 /s for the ZrC‐ZrB 2 , (3.97 ± 0.60) × 10 −18 m 3 /s for the TiC‐TiB 2 , and (2.74 ± 0.68) ± 10 ‐17 m 3 /s for the ZrC‐TiB 2 .