The cyclic stress-strain curve of discontinuously-reinforced Al- and Mg-based composites

Journal Article · Tue Mar 15 04:00:00 EST 1994 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(94)90194-5· OSTI ID:5090315

Llorca, J ^[1]

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1. Polytechnic Univ. of Madrid (Spain). Dept. of Materials Science

The analysis of the mechanical behavior of discontinuously-reinforced metal-matrix composites (MMC) has received considerable attention in recent years, owing to the potential of these materials in structural applications. Interest was initially focused on the strengthening, as well as on the new failure mechanisms, induced by the presence of ceramic reinforcements under monotonic loading conditions. Understandably, research on the constitutive response under fully-reversed cyclic loading conditions was left for a later stage, and to date this topic has been addressed in only a few studies, and the complete cyclic stress-strain curve only measured in. However, the cyclic stress-strain curve is a critical parameter in the design of structural components subjected to low-cycle fatigue, and it is also important to obtain better knowledge of the deformation and failure micromechanisms. In particular, the range of validity and of the limitations of the models developed to explain the monotonic behavior can be tested by checking the model predictions with experimental results obtained under different loading conditions, e.g. cyclic deformation. This research was aimed at measuring the cyclic stress-strain response of several Al-based composites and one Mg-based reinforced with either ceramic particulates (SiC, Al[sub 2]O[sub 3]) or whiskers (SiC), and subjected to different thermal treatments. The experimental results are discussed in the light of the emerging theories of cyclic deformation for MMC, and the areas where further research is needed are indicated.

• OSTI ID: 5090315
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 30:6; ISSN SCRMEX; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
COMPOSITE MATERIALS
DEFORMATION
MAGNESIUM ALLOYS
MATERIALS
MECHANICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
SILICON CARBIDES
SILICON COMPOUNDS