Aging kinetics of a silicon carbide reinforced Al-Zn-Mg-Cu alloy

Journal Article · Sat Jan 01 00:00:00 EST 1994 · Acta Metallurgica et Materialia

DOI:https://doi.org/10.1016/0956-7151(94)90073-6· OSTI ID:143916

Davies, C H.J.; Raghunathan, N; Sheppard, T ^[1]

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1. Univ. of London (United Kingdom). Dept. of Materials

The aging kinetics of a composite of an Al-Zn-Mg-Cu powder (CW67) combined with a varied volume fraction of a particulate silicon carbide were investigated by means of differential scanning calorimetry (DSC), X-ray diffraction (XRD) and transmission electron microscopy (TEM). DSC revealed that the maximum rate of precipitation of the metastable {eta}{prime} phase was substantially lower for CW67/SiC/20p than for the unreinforced alloy or CW67/SiC/10p. TEM of isothermally aged material revealed differences between the unreinforced alloy and composites in respect of precipitate size and morphology. The authors conclude that SiC additions, by dint of additional dislocations generated during quenching, can affect the aging of CW67 either by accelerating the nucleation of precipitates or by accelerating precipitate growth. The aging rate of CW67/SiC/20p was increased by accelerating both the nucleation of precipitates and growth, whereas the aging in CW67/SiC10p was enhanced by accelerating precipitate growth only.

• OSTI ID: 143916
• Journal Information: Acta Metallurgica et Materialia, Vol. 42, Issue 1; Other Information: PBD: Jan 1994
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
SILICON CARBIDES
AGING
COMPOSITE MATERIALS
ALUMINIUM ALLOYS
ZINC ALLOYS
MAGNESIUM ALLOYS
COPPER ALLOYS
PHASE STUDIES