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

Journal Article · Sun Aug 01 04:00:00 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), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 41:8; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

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