Dynamic deformation behavior of Al-Zn-Mg-Cu alloy matrix composites reinforced with 20 vol. % SiC

Journal Article · Sun Aug 01 00:00:00 EDT 1993 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(93)90314-I· OSTI ID:6462517

Hong, S I; Gray, III, G T ^[1]; Lewandowski, J J ^[2]

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1. Los Alamos National Lab., NM (United States)
2. Case Western Reserve Univ., Cleveland, OH (United States). Dept. of Materials Science and Engineering

The dynamic mechanical response and substructure evolution of underaged and overaged Al-Zn-Mg-Cu alloys with and without 20 vol.% SiC particles were investigated and compared to those following quasi-static compression. The hardening rates of the overaged composites and control alloys were found to be smaller than those of their underaged counterparts. Overaged composites and the control alloys showed more strain rate sensitive behavior than the underaged composites and alloys. The flow stress of the composites was found to decrease at total strains larger than 0.15 in the high-rate Hopkinson pressure bar test. A more raped decrease in stress in the underaged composites suggests that microstructural damage in the underaged condition is greater than that in the overaged condition tested at high strain rates. Cracks near the SiC/matrix interfaces were observed more frequently in the underaged Hopkinson pressure bar samples. The more frequent interface cracks in the underaged composites are thought to result from much slower relaxation of the stresses and strains built up at the interface due to much more difficult thermally activated deformation.

• OSTI ID: 6462517
• Journal Information: Acta Metallurgica et Materialia; (United States), Vol. 41:8; ISSN 0956-7151
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
DEFORMATION
MICROSTRUCTURE
COMPOSITE MATERIALS
COPPER ALLOYS
MAGNESIUM ALLOYS
SILICON CARBIDES
ZINC ALLOYS
COMPARATIVE EVALUATIONS
COMPRESSION
CRACKS
EXPERIMENTAL DATA
INTERFACES
QUATERNARY ALLOY SYSTEMS
STRAIN RATE
ALLOY SYSTEMS
ALLOYS
CARBIDES
CARBON COMPOUNDS
DATA
EVALUATION
INFORMATION
MATERIALS
NUMERICAL DATA
SILICON COMPOUNDS
360603* - Materials- Properties
360602 - Other Materials- Structure & Phase Studies