Effects of Cu and Solution Heat Treatment on Microstructure and Hardness of In-Situ Aluminium Metal Matrix Composite Containing Al4Sr Phase

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:

Metal matrix composite (MMC) ، Microstructure ، Intermetallics ، Hardness ، Heat treatment

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