Experimental investigation and thermodynamic descriptions of the Mo-Si-Ti system

Y. Yang; Y. A. Chang; L. Tan; Y. Du

doi:10.1016/S0921-5093(03)00560-4

Experimental investigation and thermodynamic descriptions of the Mo-Si-Ti system

Y. Yang, Y. A. Chang, L. Tan, Y. Du

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49 Scopus citations

Abstract

Microstructures and phase equilibria of the alloys in the Mo-Si-Ti system were studied in as-cast and long-term annealed conditions by imaging with back scattered electrons (BSE) in a scanning electron microscope (SEM), electron probe microanalysis (EPMA) and X-ray diffraction (XRD) analysis. Isothermal sections were established to describe the solid-state phase equilibria at 1600 and 1425 °C. Using the CALPHAD (CALculation of PHAse Diagram) approach, a thermodynamic data set of the Mo-Si-Ti system was optimized by considering both the present experimental results and reliable literature data. This thermodynamic modeling can satisfactorily account for the available experimental data. The liquidus surface near the metal-rich end of the Mo-Si-Ti system calculated from the present thermodynamic modeling is in good agreement with experimental observation. Two type-II invariant four-phase reactions were determined in the metal-rich region of the Mo-Si-Ti system. One is L+Mo(Ti)₅ Si₃→Ti(Mo)₅Si₃ +Mo(Ti)₃Si, and the other is L+Mo(Ti)₃Si→Ti(Mo)₅ Si₃+β(Mo,Si,Ti).

Original language	English
Pages (from-to)	281-293
Number of pages	13
Journal	Materials Science and Engineering: A
Volume	361
Issue number	1-2
DOIs	https://doi.org/10.1016/S0921-5093(03)00560-4
State	Published - Nov 25 2003
Externally published	Yes

Funding

The authors would like to thank Mr. R. Sakidja for very constructive discussions and Doug Berczik and James Myers for their interests in this work. This research was sponsored by REVOLUTIONARY HIGH PRESSURE TURBINE BLADE MATERIAL prepared under contract No. F33615-98-C-2874 for the AFRL/ML.

Funders	Funder number
AFRL/ML

Keywords

Mo-Si-Ti
Phase diagram prediction
Phase equilibria
Solidification simulation
Thermodynamic properties

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10.1016/S0921-5093(03)00560-4

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title = "Experimental investigation and thermodynamic descriptions of the Mo-Si-Ti system",

abstract = "Microstructures and phase equilibria of the alloys in the Mo-Si-Ti system were studied in as-cast and long-term annealed conditions by imaging with back scattered electrons (BSE) in a scanning electron microscope (SEM), electron probe microanalysis (EPMA) and X-ray diffraction (XRD) analysis. Isothermal sections were established to describe the solid-state phase equilibria at 1600 and 1425 °C. Using the CALPHAD (CALculation of PHAse Diagram) approach, a thermodynamic data set of the Mo-Si-Ti system was optimized by considering both the present experimental results and reliable literature data. This thermodynamic modeling can satisfactorily account for the available experimental data. The liquidus surface near the metal-rich end of the Mo-Si-Ti system calculated from the present thermodynamic modeling is in good agreement with experimental observation. Two type-II invariant four-phase reactions were determined in the metal-rich region of the Mo-Si-Ti system. One is L+Mo(Ti)5 Si3→Ti(Mo)5Si3 +Mo(Ti)3Si, and the other is L+Mo(Ti)3Si→Ti(Mo)5 Si3+β(Mo,Si,Ti).",

keywords = "Mo-Si-Ti, Phase diagram prediction, Phase equilibria, Solidification simulation, Thermodynamic properties",

author = "Y. Yang and Chang, {Y. A.} and L. Tan and Y. Du",

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T1 - Experimental investigation and thermodynamic descriptions of the Mo-Si-Ti system

AU - Yang, Y.

AU - Chang, Y. A.

AU - Tan, L.

AU - Du, Y.

PY - 2003/11/25

Y1 - 2003/11/25

N2 - Microstructures and phase equilibria of the alloys in the Mo-Si-Ti system were studied in as-cast and long-term annealed conditions by imaging with back scattered electrons (BSE) in a scanning electron microscope (SEM), electron probe microanalysis (EPMA) and X-ray diffraction (XRD) analysis. Isothermal sections were established to describe the solid-state phase equilibria at 1600 and 1425 °C. Using the CALPHAD (CALculation of PHAse Diagram) approach, a thermodynamic data set of the Mo-Si-Ti system was optimized by considering both the present experimental results and reliable literature data. This thermodynamic modeling can satisfactorily account for the available experimental data. The liquidus surface near the metal-rich end of the Mo-Si-Ti system calculated from the present thermodynamic modeling is in good agreement with experimental observation. Two type-II invariant four-phase reactions were determined in the metal-rich region of the Mo-Si-Ti system. One is L+Mo(Ti)5 Si3→Ti(Mo)5Si3 +Mo(Ti)3Si, and the other is L+Mo(Ti)3Si→Ti(Mo)5 Si3+β(Mo,Si,Ti).

AB - Microstructures and phase equilibria of the alloys in the Mo-Si-Ti system were studied in as-cast and long-term annealed conditions by imaging with back scattered electrons (BSE) in a scanning electron microscope (SEM), electron probe microanalysis (EPMA) and X-ray diffraction (XRD) analysis. Isothermal sections were established to describe the solid-state phase equilibria at 1600 and 1425 °C. Using the CALPHAD (CALculation of PHAse Diagram) approach, a thermodynamic data set of the Mo-Si-Ti system was optimized by considering both the present experimental results and reliable literature data. This thermodynamic modeling can satisfactorily account for the available experimental data. The liquidus surface near the metal-rich end of the Mo-Si-Ti system calculated from the present thermodynamic modeling is in good agreement with experimental observation. Two type-II invariant four-phase reactions were determined in the metal-rich region of the Mo-Si-Ti system. One is L+Mo(Ti)5 Si3→Ti(Mo)5Si3 +Mo(Ti)3Si, and the other is L+Mo(Ti)3Si→Ti(Mo)5 Si3+β(Mo,Si,Ti).

KW - Mo-Si-Ti

KW - Phase diagram prediction

KW - Phase equilibria

KW - Solidification simulation

KW - Thermodynamic properties

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ER -

Experimental investigation and thermodynamic descriptions of the Mo-Si-Ti system

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Keywords

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