The effect of matrix microstructure on thermally induced residual stresses in SiC/titanium aluminide composites

Journal Article · Fri Apr 01 00:00:00 EST 1994 · Journal of Engineering Materials and Technology; (United States)

DOI:https://doi.org/10.1115/1.2904276· OSTI ID:6981753

Pindera, M J ^[1]; Freed, A D ^[2]

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1. Univ. of Virginia, Charlottesville, VA (United States). Civil Engineering Applied Mechanics Dept.
2. National Aeronautics and Space Administration, Cleveland, OH (United States). Lewis Research Center

This paper examines the effect of varying the microstructural composition of titanium aluminide on the evolution of residual stresses in titanium aluminide matrix composites. An analytical model is developed to determine residual stresses in fiber and matrix phases of unidirectional, SiC/Ti-Al composites subjected to axisymmetric thermal loading. The model uses elements of the concentric cylinder model and the method of cells to calculate residual thermal stresses in the presence of temperature-dependent and inelastic behavior of the fiber and matrix phases. The concentric cylinder model is employed as a geometric model for the unidirectional composite, whereas the method of cells is employed in modeling the microstructure of the titanium aluminide matrix phase. The titanium aluminide matrix consists of distinct brittle and ductile [alpha] and [beta] phases whose volume content is varied in the present scheme to understand how the resulting residual stresses can be altered. Both spatially uniform and nonuniform variations of the [alpha] and [beta] phases are considered. The results explain the occurrence of radial microcracks in SiC/Ti-Al composites in the presence of a [beta]-depleted region at the fiber/matrix interface, and validate the potential of engineering the matrix phase to reduce residual stresses in these composites.

• OSTI ID: 6981753
• Journal Information: Journal of Engineering Materials and Technology; (United States), Vol. 116:2; ISSN 0094-4289
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
MICROSTRUCTURE
RESIDUAL STRESSES
COMPOSITE MATERIALS
SILICON CARBIDES
TITANIUM ALLOYS
INTERMETALLIC COMPOUNDS
MATHEMATICAL MODELS
THERMAL STRESSES
ALLOYS
CARBIDES
CARBON COMPOUNDS
MATERIALS
SILICON COMPOUNDS
STRESSES
360603* - Materials- Properties
360602 - Other Materials- Structure & Phase Studies