Mechanism of high strain rate superplasticity in aluminium alloy composites

Journal Article · Sat Feb 01 04:00:00 EST 1997 · Acta Materialia

DOI:https://doi.org/10.1016/S1359-6454(96)00194-2· OSTI ID:455257

Mishra, R S; Mukherjee, A K ^[1]; Bieler, T R ^[2]

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1. Univ. of California, Davis, CA (United States). Dept. of Chemical Engineering and Materials Science
2. Michigan State Univ., East Lansing, MI (United States). Dept. of Materials Science and Mechanics

A constitutive equation has been obtained through an analysis of high strain rate superplasticity (HSRS) data on a 2124 Al-Si{sub 3}-N{sub 4} composite. The parametric dependencies of HSRS in composites are different from those observed in conventional aluminium alloys and mechanically alloyed alloys. The HSRS in composites exhibits high activation energy values of 293--338 kJ mol{sup {minus}1} and an inverse grain size and reinforcement size dependence. It is suggested that the mechanism of HSRS in composites is interface controlled superplasticity. This is depicted on a new superplasticity mechanism map for composites. The map can be used as a guideline for designing composites for optimum superplasticity.

• OSTI ID: 455257
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 2 Vol. 45; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACTIVATION ENERGY
ALUMINIUM BASE ALLOYS
COMPOSITE MATERIALS
GRAIN SIZE
INTERFACES
PLASTICITY
PREDICTION EQUATIONS
SILICON NITRIDES
STRAIN RATE
STRESSES