Microstructural investigation of Cr-Hf-Si alloys

J. Schoonover; Y. Yang; W. J. Heward; D. Dalpe; A. Deal; M. Othon; J. R. Cournoyer; Y. A. Chang; D. Lewis; B. P. Bewlay

doi:10.1016/j.intermet.2008.06.012

Microstructural investigation of Cr-Hf-Si alloys

J. Schoonover, Y. Yang, W. J. Heward, D. Dalpe, A. Deal, M. Othon, J. R. Cournoyer, Y. A. Chang, D. Lewis, B. P. Bewlay

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

Cr-Hf-Si alloys with Si concentrations up to 40 at.% were fabricated in order to study solidification microstructures in the metal-rich end of the Cr-Hf-Si ternary system. The microstructures were compared with a liquidus projection that was calculated from the extrapolated Cr-Hf-Si thermodynamic description using the CALPHAD approach. Two ternary eutectic reactions were found: L → Cr₂Hf (HT) + Hf₂Si + β-(Hf) at approximately Hf-33Cr-3Si and L → Cr₃Si + (Cr) + Cr₂Hf (HT) at approximately Hf-73Cr-9Si. The ternary phase CrHfSi was also seen. The experimental data agreed with the Hf-rich end of the calculated liquidus projection, and it was suggested how the Cr-rich end could be adjusted to account for the experimental results.

Original language	English
Pages (from-to)	1109-1117
Number of pages	9
Journal	Intermetallics
Volume	16
Issue number	9
DOIs	https://doi.org/10.1016/j.intermet.2008.06.012
State	Published - Sep 2008
Externally published	Yes

Keywords

A. Intermetallics, miscellaneous
A. Silicides, various
B. Phase diagrams
B. Phase identification
D. Microstructure

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10.1016/j.intermet.2008.06.012

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title = "Microstructural investigation of Cr-Hf-Si alloys",

abstract = "Cr-Hf-Si alloys with Si concentrations up to 40 at.\% were fabricated in order to study solidification microstructures in the metal-rich end of the Cr-Hf-Si ternary system. The microstructures were compared with a liquidus projection that was calculated from the extrapolated Cr-Hf-Si thermodynamic description using the CALPHAD approach. Two ternary eutectic reactions were found: L → Cr2Hf (HT) + Hf2Si + β-(Hf) at approximately Hf-33Cr-3Si and L → Cr3Si + (Cr) + Cr2Hf (HT) at approximately Hf-73Cr-9Si. The ternary phase CrHfSi was also seen. The experimental data agreed with the Hf-rich end of the calculated liquidus projection, and it was suggested how the Cr-rich end could be adjusted to account for the experimental results.",

keywords = "A. Intermetallics, miscellaneous, A. Silicides, various, B. Phase diagrams, B. Phase identification, D. Microstructure",

author = "J. Schoonover and Y. Yang and Heward, \{W. J.\} and D. Dalpe and A. Deal and M. Othon and Cournoyer, \{J. R.\} and Chang, \{Y. A.\} and D. Lewis and Bewlay, \{B. P.\}",

year = "2008",

month = sep,

doi = "10.1016/j.intermet.2008.06.012",

language = "English",

volume = "16",

pages = "1109--1117",

journal = "Intermetallics",

issn = "0966-9795",

publisher = "Elsevier",

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TY - JOUR

T1 - Microstructural investigation of Cr-Hf-Si alloys

AU - Schoonover, J.

AU - Yang, Y.

AU - Heward, W. J.

AU - Dalpe, D.

AU - Deal, A.

AU - Othon, M.

AU - Cournoyer, J. R.

AU - Chang, Y. A.

AU - Lewis, D.

AU - Bewlay, B. P.

PY - 2008/9

Y1 - 2008/9

N2 - Cr-Hf-Si alloys with Si concentrations up to 40 at.% were fabricated in order to study solidification microstructures in the metal-rich end of the Cr-Hf-Si ternary system. The microstructures were compared with a liquidus projection that was calculated from the extrapolated Cr-Hf-Si thermodynamic description using the CALPHAD approach. Two ternary eutectic reactions were found: L → Cr2Hf (HT) + Hf2Si + β-(Hf) at approximately Hf-33Cr-3Si and L → Cr3Si + (Cr) + Cr2Hf (HT) at approximately Hf-73Cr-9Si. The ternary phase CrHfSi was also seen. The experimental data agreed with the Hf-rich end of the calculated liquidus projection, and it was suggested how the Cr-rich end could be adjusted to account for the experimental results.

AB - Cr-Hf-Si alloys with Si concentrations up to 40 at.% were fabricated in order to study solidification microstructures in the metal-rich end of the Cr-Hf-Si ternary system. The microstructures were compared with a liquidus projection that was calculated from the extrapolated Cr-Hf-Si thermodynamic description using the CALPHAD approach. Two ternary eutectic reactions were found: L → Cr2Hf (HT) + Hf2Si + β-(Hf) at approximately Hf-33Cr-3Si and L → Cr3Si + (Cr) + Cr2Hf (HT) at approximately Hf-73Cr-9Si. The ternary phase CrHfSi was also seen. The experimental data agreed with the Hf-rich end of the calculated liquidus projection, and it was suggested how the Cr-rich end could be adjusted to account for the experimental results.

KW - A. Intermetallics, miscellaneous

KW - A. Silicides, various

KW - B. Phase diagrams

KW - B. Phase identification

KW - D. Microstructure

UR - https://www.scopus.com/pages/publications/50249097227

U2 - 10.1016/j.intermet.2008.06.012

DO - 10.1016/j.intermet.2008.06.012

M3 - Article

AN - SCOPUS:50249097227

SN - 0966-9795

VL - 16

SP - 1109

EP - 1117

JO - Intermetallics

JF - Intermetallics

IS - 9

ER -

Microstructural investigation of Cr-Hf-Si alloys

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Keywords

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