EFFECTS OF HOT EXTRUSION RATIO ON MICROSTRUCTURE OF Al – 25 WT.%Mg2Si IN-SITU METAL MATRIX COMPOSITE
Publish place: 1st International and 6th Joint Conference of Iranian Society of Metallurgical Engineers and the scientific community of Casting
Publish Year: 1391
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
IMES06_102
تاریخ نمایه سازی: 8 بهمن 1391
Abstract:
This study was undertaken to investigate the effects of hot extrusion ratio on the microstructure of cast aluminum metal matrix composite (MMC) containing 25 wt.% coarse Mg2Siprimary particles. Different extrusion ratios (6:1, 12:1 and 18:1) were applied on the small cast composite ingots at 520 ºC. Microstructural data were assessed by the use of optical microscope (OM) equipped with quantitative data analyzer and scanning electron microscope (SEM). The results showed that hot extrusion with the ratio of 18:1 has the maximum effect on the size reduction of Mg2Si particles. Particle fracturing during hot extrusion changes the size of coarse Mg2Si particles from 92 μm to 24 μm, which shows about 75% reduction. Due to high stress-concentrated areas around Mg2Si particles, reduction in the size of primary Mg2Si particles reduces the stressconcentrated areas and results in enhancing mechanical properties.
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Authors
Seyed Ehsan Vaziri Yeganeh
Imam Khomeini International University, Qazvin, Iran
Massoud Emamy
School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, P.O. Box: ۱۴۳۹۵-۷۳۱, Iran
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