Activation energy for superplastic flow in aluminum matrix composites exhibiting high-strain-rate superplasticity

Journal Article · Sat Jun 15 04:00:00 EDT 1996 · Scripta Materialia

DOI:https://doi.org/10.1016/1359-6462(96)00069-3· OSTI ID:271734

Mabuchi, M ^[1]; Higashi, K ^[2]

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1. National Industrial Research Inst. of Nagoya (Japan)
2. Osaka Prefecture Univ., Sakai (Japan)

It is recognized that the activation energy for superplastic flow in metals is in agreement with the activation energy for lattice self-diffusion or for grain boundary diffusion. Moreover, Mishra et al. showed that the activation energy for superplastic flow in a high strain rate superplastic SiC{sub w}/2124Al composite was 313 KJ/mol and they noted that the activation energy was higher than the activation energy for lattice self-diffusion of aluminum (=142 KJ/mol). Very recently, Higashi et al. revealed that an apparent value of the activation energy for superplastic flow was increased by the presence of a liquid phase for mechanically-alloyed materials exhibiting high-strain-rate superplasticity. The same trend was reported in the high-strain-rate superplastic Si{sub 3}N{sub 4w}/Al-Zn-Mg composite. However, there are a few works describing the activation energy for superplastic flow in metal matrix composites from the viewpoint of effects of a liquid phase. In this paper, the activation energies for superplastic flow in a variety of high-strain-rate superplastic Al-Mg(5052), Al-Mg-Si(6061), Al-Zn-Mg(7064) and Al-Cu-Mg(2124) alloy matrix composites have been analyzed.

• OSTI ID: 271734
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 12 Vol. 34; ISSN 1359-6462; ISSN XZ503X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
BURGERS VECTOR
COMPOSITE MATERIALS
COPPER ALLOYS
ELONGATION
FLOW STRESS
GRAIN SIZE
MAGNESIUM ALLOYS
MELTING
PLASTICITY
SILICON ALLOYS
SILICON NITRIDES
STRAINS
TEMPERATURE DEPENDENCE
ZINC ALLOYS