Structure development of Al-Zn-Cu/Al3Mg2 composite fabricated by mechanical alloying

In the current study, the effect of milling time on the grain size of Al-Zn-Cu/Al3Mg2 composite was investigated. In order to produce the composite, Al3Mg2 milled powders as a reinforcement particles were added to Al-Zn-Cu milled powder as a matrix phase and then they were milled together. Different milling times (10, 15 and 20 hours) were used in this study. XRD analysis and Scanning Electron Microscopy (SEM) were used to investigate the grain size of the milled composite powder. The result indicates that the optimum milling time to achieve the lowest grain size is 20 hours. Longer milling times (more than 20 hours) were found to be unsuitable due to the declined Al3Mg2 grain size resulted from the expansion of Al3Mg2 particle special surfaces. Therefore, this phenomenon causes more reaction between the particles and environment which results in burning lost of the particles.

کلیدواژه ها:

Complex metallic alloy ، β-Al3Mg2 ، Metal Matrix Composite ، mechanical alloying