Superplasticity and superplastic forming of aluminum metal-matrix composites

Journal Article · Sun Nov 01 04:00:00 EST 1992 · JOM (Journal of the Minerals, Metals and Materials Society); (United States)

DOI:https://doi.org/10.1007/BF03222843· OSTI ID:6838425

Nieh, T G; Wadsworth, J ^[1]

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1. Lawrence Livermore National Lab., CA (United States)

Superplasticity has been observed in many aluminum metal-matrix composites at extremely high strain rates (approximately 0.1-1/s). These materials generally exhibited a strain-rate sensitivity value of about 0.3 and a maximum elongation of about 300 percent. It is believed that the presence of a liquid phase, or in some cases a low-melting-point region, at the reinforcement/matrix interfaces is responsible for the phenomenon. This phenomenon is not observed in all reinforced composites, despite the fact that they contain fine grain sizes. Thus, a fine matrix grain size is a necessary but insufficient condition for the high-strain-rate superplasticity. 20 refs.

• OSTI ID: 6838425
• Journal Information: JOM (Journal of the Minerals, Metals and Materials Society); (United States), Journal Name: JOM (Journal of the Minerals, Metals and Materials Society); (United States) Vol. 44:11; ISSN 1047-4838; ISSN JOMMER
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALLOYS
ALUMINIUM ALLOYS
CARBIDES
CARBON COMPOUNDS
COMPOSITE MATERIALS
CRYSTAL STRUCTURE
GRAIN SIZE
ISOTHERMAL PROCESSES
MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
MELTING POINTS
MICROSTRUCTURE
NONDESTRUCTIVE TESTING
PHYSICAL PROPERTIES
PLASTICITY
SILICON CARBIDES
SILICON COMPOUNDS
SIZE
STRAIN RATE
STRESSES
TESTING
THERMAL STRESSES
THERMAL TESTING
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
VISCOSITY