EFFECTS OF CU AND SOLUTION HEAT TREATMENT ON THE MICROSTRUCTURE AND HARDNESS OF IN-SITU ALUMINIUM MATRIX COMPOSITE CONTAINING AL4SR PHASE

Iranian Journal of Materials Science and Engineering

M. Emamy¹  K. Tavighi¹  A. R. Emami² 

[1] School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran,Iran;Young Researchers Club, Science and Research Branch, Islamic Azad University, Tehran, Iran.;

关键词: Metal matrix composite (MMC);    Microstructure;    Intermetallic;    Hardness;    Heat treatment.;   

DOI  :  

来源: DOAJ

【 摘 要 】

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-like 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 at the grain boundaries. Heat treatment partially dissolves Cu-intermetallics and homogenizes the distribution of θ phase in the matrix.

【 授权许可】

Unknown