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- Title
EFFECT OF Al<sub>2</sub>O<sub>3</sub> PARTICULATES ON THE PROPERTIES OF THE SINTERED Al-Zn-Mg-Cu-Ni-Co ALLOY AFTER T6 AND RRA TREATMENTS.
- Authors
NAEEM, H. T.; MOHAMMED, K. S.
- Abstract
In this study, the effects of Alumina particles on the microstructure and the hardness of experimental an Al-Zn-Mg-Cu-Fe-Cr-Ni-Co matrix alloy was produced using powder metallurgy. Aluminum matrix composite reinforced with Al2O3 particles of volume fraction 5% with average size about 4μm was investigated. The prepared composite powders were consolidated by cold pressing and then the sintered. The sintered composite samples have been subjected to a homogenization treated then aged at (T6 temper) and retrogressed, and then re-aged (RRA). The results indicated that the T6 heat treatment increases the hardness of an Al-composite compared to be as sintered. With applying the retrogression and reging process, aluminum matrix composite has the highest hardness. This improvement of microhardness attributed to the precipitation hardening from having of MgZn, Mg2Zn11 phases, additionally the dispersion strengthening of Al2O3P, Ni and/or Co-dispersoid intermetallic compound in the matrix. Microstructure characterization of an Aluminum matrix composite was carried out using optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD.
- Publication
Digest Journal of Nanomaterials & Biostructures (DJNB), 2015, Vol 10, Issue 2, p445
- ISSN
1842-3582
- Publication type
Academic Journal