Residual thermal stresses in MoSi2-Mo5Si3 in-situ composites

P. Peralta; R. Dickerson; J. R. Michael; K. J. McClellan; F. Chu; T. E. Mitchell

doi:10.1016/s0921-5093(98)01074-0

Residual thermal stresses in MoSi₂-Mo₅Si₃ in-situ composites

P. Peralta, R. Dickerson, J. R. Michael, K. J. McClellan, F. Chu, T. E. Mitchell

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

17 Scopus citations

Abstract

Residual thermal stresses in MoSi₂-Mo₅Si₃ in-situ composites are calculated for a dilute concentration of particles of one phase embedded in a matrix of the other, using the fields of anisotropic ellipsoidal inclusions. Additionally, the eutectic interfaces are modeled as boundaries between two anisotropic half-spaces. The misorientation between MoSi₂-Mo₅Si₃ is obtained from the literature for Mo₅Si₃ precipitates in MoSi₂ and by electron diffraction in the scanning electron microscope (SEM) for the opposite case. Tensile stresses of up to 3 GPa can develop after cooling from the eutectic temperature due to the thermal expansion mismatch between the phases. Electron microscopy of arc-melted Si-rich Mo₅Si₃ shows that stresses are relieved by intergranular fracture in Mo₅Si₃ and either dislocation plasticity or transgranular cracks in MoSi₂, in a manner consistent with the calculations.

Original language	English (US)
Pages (from-to)	261-269
Number of pages	9
Journal	Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
Volume	261
Issue number	1-2
DOIs	https://doi.org/10.1016/s0921-5093(98)01074-0
State	Published - Mar 15 1999
Externally published	Yes

Keywords

Dislocation plasticity
Eutectic interfaces
In-situ composites
Molybdenum disilicide
Residual thermal stress

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Access to Document

10.1016/s0921-5093(98)01074-0

Cite this

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title = "Residual thermal stresses in MoSi2-Mo5Si3 in-situ composites",

abstract = "Residual thermal stresses in MoSi2-Mo5Si3 in-situ composites are calculated for a dilute concentration of particles of one phase embedded in a matrix of the other, using the fields of anisotropic ellipsoidal inclusions. Additionally, the eutectic interfaces are modeled as boundaries between two anisotropic half-spaces. The misorientation between MoSi2-Mo5Si3 is obtained from the literature for Mo5Si3 precipitates in MoSi2 and by electron diffraction in the scanning electron microscope (SEM) for the opposite case. Tensile stresses of up to 3 GPa can develop after cooling from the eutectic temperature due to the thermal expansion mismatch between the phases. Electron microscopy of arc-melted Si-rich Mo5Si3 shows that stresses are relieved by intergranular fracture in Mo5Si3 and either dislocation plasticity or transgranular cracks in MoSi2, in a manner consistent with the calculations.",

keywords = "Dislocation plasticity, Eutectic interfaces, In-situ composites, Molybdenum disilicide, Residual thermal stress",

author = "P. Peralta and R. Dickerson and Michael, {J. R.} and McClellan, {K. J.} and F. Chu and Mitchell, {T. E.}",

note = "Funding Information: This work was supported by the US Department of Energy, Office of Basic Energy Science, and a Director Funded Postdoctoral Fellowship at LANL (P. Peralta). ",

year = "1999",

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doi = "10.1016/s0921-5093(98)01074-0",

language = "English (US)",

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T1 - Residual thermal stresses in MoSi2-Mo5Si3 in-situ composites

AU - Peralta, P.

AU - Dickerson, R.

AU - Michael, J. R.

AU - McClellan, K. J.

AU - Chu, F.

AU - Mitchell, T. E.

N1 - Funding Information: This work was supported by the US Department of Energy, Office of Basic Energy Science, and a Director Funded Postdoctoral Fellowship at LANL (P. Peralta).

PY - 1999/3/15

Y1 - 1999/3/15

N2 - Residual thermal stresses in MoSi2-Mo5Si3 in-situ composites are calculated for a dilute concentration of particles of one phase embedded in a matrix of the other, using the fields of anisotropic ellipsoidal inclusions. Additionally, the eutectic interfaces are modeled as boundaries between two anisotropic half-spaces. The misorientation between MoSi2-Mo5Si3 is obtained from the literature for Mo5Si3 precipitates in MoSi2 and by electron diffraction in the scanning electron microscope (SEM) for the opposite case. Tensile stresses of up to 3 GPa can develop after cooling from the eutectic temperature due to the thermal expansion mismatch between the phases. Electron microscopy of arc-melted Si-rich Mo5Si3 shows that stresses are relieved by intergranular fracture in Mo5Si3 and either dislocation plasticity or transgranular cracks in MoSi2, in a manner consistent with the calculations.

AB - Residual thermal stresses in MoSi2-Mo5Si3 in-situ composites are calculated for a dilute concentration of particles of one phase embedded in a matrix of the other, using the fields of anisotropic ellipsoidal inclusions. Additionally, the eutectic interfaces are modeled as boundaries between two anisotropic half-spaces. The misorientation between MoSi2-Mo5Si3 is obtained from the literature for Mo5Si3 precipitates in MoSi2 and by electron diffraction in the scanning electron microscope (SEM) for the opposite case. Tensile stresses of up to 3 GPa can develop after cooling from the eutectic temperature due to the thermal expansion mismatch between the phases. Electron microscopy of arc-melted Si-rich Mo5Si3 shows that stresses are relieved by intergranular fracture in Mo5Si3 and either dislocation plasticity or transgranular cracks in MoSi2, in a manner consistent with the calculations.

KW - Dislocation plasticity

KW - Eutectic interfaces

KW - In-situ composites

KW - Molybdenum disilicide

KW - Residual thermal stress

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