CORRELATION OF MICROSTRUCTURE AND FRACTURE-TOUGHNESS OF A RAPID SOLIDIFICATION POWDER-METALLURGY AL-FE-V-SI ALLOY
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SCOPUS
- Title
- CORRELATION OF MICROSTRUCTURE AND FRACTURE-TOUGHNESS OF A RAPID SOLIDIFICATION POWDER-METALLURGY AL-FE-V-SI ALLOY
- Authors
- KIM, NJ; LEE, DY; LEE, SH
- Date Issued
- 1991-10-30
- Publisher
- ELSEVIER SCIENCE SA
- Abstract
- The principal metallurgical factor leading to embrittlement of a rapid solidification-powder metallurgy (RS-PM) Al-Fe-V-Si alloy after high temperature exposure at 480-degrees-C was identified. Although the RS-PM Al-Fe-V-Si alloy showed excellent high temperature stability compared to an ingot metallurgy 2219 aluminium alloy, the Al-Fe-V-Si alloy exhibited a decreasing fracture toughness together with yield strength and ductility after high temperature exposure. In situ scanning electron microscopy observations of crack-opening processes showed that brittle cleavage-like fracture occurred at the coarse Al13Fe4 particles that were formed during exposure at 480-degrees-C. This led to the reduction in fracture toughness of the Al-Fe-V-Si alloy. Fracture toughness tests were interpreted using a simplified ductile fracture initiation model based on the assumption that crack extension initiates at a certain critical strain over a microstructurally significant critical distance. This model correlated microstructural factors with fracture toughness and confirmed that the presence of coarse Al13Fe4 particles was responsible for the embrittlement phenomenon in the Al-Fe-V-Si alloy after high temperature exposure.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/29384
- DOI
- 10.1016/0921-5093(91)90802-T
- ISSN
- 0921-5093
- Article Type
- Article
- Citation
- MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, vol. 147, no. 1, page. 33 - 44, 1991-10-30
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