Effects of Solution Heat Treatment on the Microstructure and Tensile Properties of Al-15wt.%Mg2Si-5wt.%Zn Metal Matrix Composite Containing 0.5%Ni
Publish Year: 1392
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
IMES07_320
تاریخ نمایه سازی: 28 آذر 1392
Abstract:
This study was carried out to investigate the effects of solution heat treatment on the microstructure and tensile properties of cast Al-15Mg2Si-5Zn metal matrix composite (MMC) containing 0.5wt%Ni. Microstructural examinations were assessed by the use of optical microscope (OM), scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS). It was found that addition of 0.5 wt.% Ni has a strong effect on the size of primary Mg2Si particles. It decreases the size of the particles from 40 μm to 16 μm which shows 60% improvement. This progress enhances both UTS and elongation values of the material from 260 MPa to 290 MPa and 2.5% to 5.2% respectively. Further results revealed that solution heat treatment dissolves Zn-rich intermetallics which were segregated at the grain boundaries. This mainly improves the elongation value up to 6.5% in the MMC containing 0.5 wt.% Ni after solutionizing. The study of the fracture surfaces of the heat treated specimens revealed fine dimples which are the main characteristic of ductile fracture mode
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Authors
A. B. Eradi-Zare
Department of Materials Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran
M. Emamy
School of Material and Metallurgy Engineering, University of Tehran, Tehran, Iran
K. Tavighi
School of Material and Metallurgy Engineering, University of Tehran, Tehran, Iran
H. Karimi jafari
Imam Khomeini International University, Ghazvin, Iran
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