Effect of ZrB2 Nanoparticles Addition to AA2618 on the Microstructural and Mechanical Properties by SCT


Abdullah Dhayea Assi, Bushra Rashid*


Middle Technical University, Institute of Technology, Baghdad, Iraq

Corresponding Author Email: bushrarasheed50@mtu.edu.iq

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

This study concentrates on the manufacturing of AA2618/ZrB2 aluminum-matrix composites (AMCs) using a liquid metallurgy process. The zirconium diboride nanoparticles (ZrB2) of three different weight percentage, i.e., (0, 3, 6 and 9) %, are reinforced with aluminum alloy (AA2618) by using the stir casting technique (SCT). Hardness, tensile and compression tests were brought up to estimate the mechanical behavior of the composites. The microstructures of the composites were analyzed using a scanning electron microscope (SEM). The SEM microphotographs proved that the successful dispersion of ZrB2 particles into the matrix of the aluminum. It is clearly shown that tensile fracture morphology reveals different modes of fractures, like brittle and ductile. The unreinforced AA2618 plain matrix alloys are undergoing the ductile mode of fracturing, but with a raise in zirconium diboride the failure mode progressively switches to the brittle fracture. The mechanical properties of the composites are enhanced after the dispersion of ZrB2 particles. A tremendous improvement in the mechanical properties of the AMCs was found for 9 wt. % ZrB2 particles in the matrix.