Thermodynamic modeling of the Hf-Ti-Si ternary system

Y. Yang; B. P. Bewlay; Y. A. Chang

doi:10.1016/j.intermet.2006.05.002

Thermodynamic modeling of the Hf-Ti-Si ternary system

Y. Yang, B. P. Bewlay, Y. A. Chang

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

14 Scopus citations

Abstract

A thermodynamic description of the Hf-Ti-Si system was developed using the phenomenological or Calphad approach, based on the critically assessed binary thermodynamic descriptions and experimental data of ternary phase equilibria. The parameters of all ternary phases were optimized using experimentally measured solid-state phase equilibria at 1350 °C, melting temperatures of selected alloys, and primary solidification information for metal-rich Hf-Ti-Si alloys. Comparisons between the calculated results and the experimental measurements show that the present modeling can satisfactorily describe the experimental information for the metal-rich region of the Hf-Ti-Si ternary phase diagram for Si concentrations of up to 40 at%. The experimentally identified transition reaction L + Hf(Ti)₂Si → (Hf,Ti)₅Si₃ + β(Hf,Ti,Si) at the metal-rich end of the ternary phase diagram is confirmed by this calculation.

Original language	English
Pages (from-to)	168-176
Number of pages	9
Journal	Intermetallics
Volume	15
Issue number	2
DOIs	https://doi.org/10.1016/j.intermet.2006.05.002
State	Published - Feb 2007
Externally published	Yes

Keywords

A. Intermetallics, miscellaneous
A. Silicides, various
B. Phase diagrams
B. Thermodynamic and thermochemical properties
E. Phase diagram, prediction

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10.1016/j.intermet.2006.05.002

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title = "Thermodynamic modeling of the Hf-Ti-Si ternary system",

abstract = "A thermodynamic description of the Hf-Ti-Si system was developed using the phenomenological or Calphad approach, based on the critically assessed binary thermodynamic descriptions and experimental data of ternary phase equilibria. The parameters of all ternary phases were optimized using experimentally measured solid-state phase equilibria at 1350 °C, melting temperatures of selected alloys, and primary solidification information for metal-rich Hf-Ti-Si alloys. Comparisons between the calculated results and the experimental measurements show that the present modeling can satisfactorily describe the experimental information for the metal-rich region of the Hf-Ti-Si ternary phase diagram for Si concentrations of up to 40 at%. The experimentally identified transition reaction L + Hf(Ti)2Si → (Hf,Ti)5Si3 + β(Hf,Ti,Si) at the metal-rich end of the ternary phase diagram is confirmed by this calculation.",

keywords = "A. Intermetallics, miscellaneous, A. Silicides, various, B. Phase diagrams, B. Thermodynamic and thermochemical properties, E. Phase diagram, prediction",

author = "Y. Yang and Bewlay, {B. P.} and Chang, {Y. A.}",

year = "2007",

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doi = "10.1016/j.intermet.2006.05.002",

language = "English",

volume = "15",

pages = "168--176",

journal = "Intermetallics",

issn = "0966-9795",

publisher = "Elsevier",

number = "2",

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TY - JOUR

T1 - Thermodynamic modeling of the Hf-Ti-Si ternary system

AU - Yang, Y.

AU - Bewlay, B. P.

AU - Chang, Y. A.

PY - 2007/2

Y1 - 2007/2

N2 - A thermodynamic description of the Hf-Ti-Si system was developed using the phenomenological or Calphad approach, based on the critically assessed binary thermodynamic descriptions and experimental data of ternary phase equilibria. The parameters of all ternary phases were optimized using experimentally measured solid-state phase equilibria at 1350 °C, melting temperatures of selected alloys, and primary solidification information for metal-rich Hf-Ti-Si alloys. Comparisons between the calculated results and the experimental measurements show that the present modeling can satisfactorily describe the experimental information for the metal-rich region of the Hf-Ti-Si ternary phase diagram for Si concentrations of up to 40 at%. The experimentally identified transition reaction L + Hf(Ti)2Si → (Hf,Ti)5Si3 + β(Hf,Ti,Si) at the metal-rich end of the ternary phase diagram is confirmed by this calculation.

AB - A thermodynamic description of the Hf-Ti-Si system was developed using the phenomenological or Calphad approach, based on the critically assessed binary thermodynamic descriptions and experimental data of ternary phase equilibria. The parameters of all ternary phases were optimized using experimentally measured solid-state phase equilibria at 1350 °C, melting temperatures of selected alloys, and primary solidification information for metal-rich Hf-Ti-Si alloys. Comparisons between the calculated results and the experimental measurements show that the present modeling can satisfactorily describe the experimental information for the metal-rich region of the Hf-Ti-Si ternary phase diagram for Si concentrations of up to 40 at%. The experimentally identified transition reaction L + Hf(Ti)2Si → (Hf,Ti)5Si3 + β(Hf,Ti,Si) at the metal-rich end of the ternary phase diagram is confirmed by this calculation.

KW - A. Intermetallics, miscellaneous

KW - A. Silicides, various

KW - B. Phase diagrams

KW - B. Thermodynamic and thermochemical properties

KW - E. Phase diagram, prediction

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U2 - 10.1016/j.intermet.2006.05.002

DO - 10.1016/j.intermet.2006.05.002

M3 - Article

AN - SCOPUS:33751200652

SN - 0966-9795

VL - 15

SP - 168

EP - 176

JO - Intermetallics

JF - Intermetallics

IS - 2

ER -

Thermodynamic modeling of the Hf-Ti-Si ternary system

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Keywords

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