Effects of Cu and Solution Heat Treatment on Microstructure and Hardness of In-Situ Aluminium Metal Matrix Composite Containing Al4Sr Phase
محل انتشار: دومین کنفرانس بین المللی آلومینیوم
سال انتشار: 1391
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 1,156
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شناسه ملی سند علمی:
IIAC02_012
تاریخ نمایه سازی: 12 اردیبهشت 1392
چکیده مقاله:
This study was undertaken to investigate the effects of Cu and solution heat treatment on the microstructure and hardness of cast Al-Al4Sr metal matrix composite. Different amounts of Cu (0.3, 0.5, 1, 3 and 5 wt.%) were added to the composite. Specimens were heat treated at 500 ˚C for 4 hours followed by water quenching. Microstructural studies were assessed by the use of optical microscope, scanning electron microscope (SEM) and x-ray diffractometry (XRD). The results showed that addition of 5 wt.% Cu reduces the length of large needle Al4Sr phase and refines the microstructure. In addition, the presence of Cu-intermetallics increases hardness of the composite. Cu mainly forms θ phase which segregates in grain boundaries. Heat treatment partially dissolves Cu-intermetallics and homogenizes the distribution of θ phase in the matrix.
کلیدواژه ها:
نویسندگان
K. Tavighi
School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, P.O. Box: ۱۴۳۹۵-۷۳۱, Iran
M. Emamy
School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, P.O. Box: ۱۴۳۹۵-۷۳۱, Iran
A. R. Emami
Young Researchers Club, Science and Research Branch, Islamic Azad University, Tehran, Iran