Microstructure-fatigue crack propagation relationship in TiB{sub 2} particulate reinforced Zn (ZA-8) alloy
- Univ. of Toronto, Ontario (Canada). Dept. of Metallurgy and Materials Science
- MTL/CANMET, Ottawa, Ontario (Canada). Dept. of Natural Resources Canada
The relationship between microstructure and propagation behavior of fatigue crack in TiB{sub 2} particulate reinforced ZA-8 Zn alloy and in the corresponding constituent matrix material was studied in three point bending fatigue tests with well-polished and pre-etched specimens. Special attention was paid to the observation of microstructure along the crack path as well as on the fracture surface. Mechanism for the difference in fatigue crack growth behavior of the two materials was investigated. The present results indicate that the addition of reinforcement modified the solidification process of the matrix material leading to a considerable change in the matrix microstructure. This change in the matrix microstructure and the presence of reinforcing particles considerably affected the fatigue crack propagation behavior in the material.
- OSTI ID:
- 109754
- Report Number(s):
- CONF-950521--; ISBN 1-56676-313-4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINIUM ALLOYS
BENDING
CASTING
CHEMICAL COMPOSITION
COMPOSITE MATERIALS
CRACK PROPAGATION
CRACKS
DENDRITES
EUTECTICS
EXPERIMENTAL DATA
FATIGUE
FRACTURE MECHANICS
FRACTURE PROPERTIES
MICROSTRUCTURE
PARTICLE SIZE
PARTICULATES
PHASE DIAGRAMS
SCANNING ELECTRON MICROSCOPY
STRESS INTENSITY FACTORS
TITANIUM BORIDES
ZINC ALLOYS