Thermally and mechanically induced residual strains in Al-SiC composites

Journal Article · Tue Sep 01 00:00:00 EDT 1992 · Acta Metallurgica; (United States)

OSTI ID:6917306

Dovirk, G L; Nutt, S R; Needleman, A ^[1]; Stout, M G; Bourke, M; Goldstone, J A; Lawson, A C; Lovato, M ^[2]; Maeewen, S R ^[3]

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1. Brown Univ., Providence, RI (United States). Dept. of Engineering
2. Los Alamos National Lab., NM (United States)
3. Alcan International Ltd, Kingston Research and Development Centre, Kingston, Ontario (Canada)

This paper reports that neutron diffraction experiments were conducted on 15 vol.% whisker and 20 vol.% particulate reinforced aluminum/silicon carbide composites subjected to a rapid quench followed by various deformation histories. Corresponding numerical simulations were carried out using an axisymmetric unit cell model, with a phenomenological, isotropic hardening description of matrix plasticity. Thermal expansion and the temperature dependence of material properties were accounted for. For the whisker reinforced matrix, quantitative agreement was generally found between the measured and calculated residual elastic strains. For the particulate reinforced matrix, the calculations tended to overestimate the magnitude of the residual strains parallel to the deformation axis, but very good agreement was obtained transverse to the deformation axis. For the silicon carbide reinforcement, both whisker and particulate, the variation of predicted residual elastic strains along the deformation axis was qualitatively consistent with the measurements, although quantitative agreement was often lacking. Measured and predicted residual strains perpendicular to the deformation axis for the silicon carbide typically were not in agreement. Parametric studies were carried out to ascertain the dependence of calculated flow strengths and residual strains on cell and reinforcement aspect ratio, and on reinforcement spacing and shape.

• OSTI ID: 6917306
• Journal Information: Acta Metallurgica; (United States), Journal Name: Acta Metallurgica; (United States) Vol. 40:9; ISSN 0001-6160; ISSN AMETAR
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
360603 -- Materials-- Properties
ALUMINIUM COMPOUNDS
CARBIDES
CARBON COMPOUNDS
COHERENT SCATTERING
COMPOSITE MATERIALS
CRYSTALS
DEFORMATION
DIFFRACTION
EXPANSION
HARDENING
MATERIALS
MECHANICAL PROPERTIES
MECHANICS
MONOCRYSTALS
NEUTRON DIFFRACTION
PARTICLES
PARTICULATES
PLASTICITY
QUENCHING
REINFORCED MATERIALS
RESIDUAL STRESSES
SCATTERING
SILICON CARBIDES
SILICON COMPOUNDS
SIMULATION
STRESSES
TEMPERATURE EFFECTS
THERMAL EXPANSION
WHISKERS