In situ observation of partial melting in superplastic aluminum alloy composites at high temperature

Journal Article · Sun Jan 01 04:00:00 EST 1995 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(95)90275-9· OSTI ID:6631055

Koike, J ^[1]; Mabuchi, M ^[2]; Higashi, K ^[3]

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1. Oregon State Univ., Corvallis, OR (United States). Dept. of Mechanical Engineering
2. Government Industrial Research Inst., Nagoya (Japan)
3. Univ. of Osaka Prefecture (Japan). Dept. of Mechanical Systems Engineering

The possibility of partial melting and its relations to the superplasticity at high strain rates were studied with transmission electron microscopy and differential scanning calorimetry in Al-Cu-Mg(2124), Al-Mg (5052), and Al-Mg-Si (6061) alloys reinforced with Si[sub 3]N[sub 4] particles. Calorimetry measurements of all three composites showed a sharp endothermic peak at an optimum superplastic temperature. At the same temperature, transmission electron microscopy showed the melting of grain boundaries and interfaces, suggesting direct correlations between partial melting and the superplasticity. Solute segregation was also observed at boundaries and interfaces, and was discussed as causes for partial melting.

• OSTI ID: 6631055
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 43:1; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
360606 -- Other Materials-- Physical Properties-- (1992-)
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM BASE ALLOYS
CALORIMETRY
COMPOSITE MATERIALS
COPPER ALLOYS
GRAIN BOUNDARIES
INTERFACES
MAGNESIUM ALLOYS
MATERIALS
MELTING
MICROSTRUCTURE
NITRIDES
NITROGEN COMPOUNDS
PHASE TRANSFORMATIONS
PNICTIDES
SEGREGATION
SILICON ALLOYS
SILICON COMPOUNDS
SILICON NITRIDES