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Microstructure and mechanical properties of the Mg–Zn–Cu/SiCp composite in the as-cast and as-extruded conditions

Published online by Cambridge University Press:  02 September 2019

Afshin Nafari ,
Mehdi Malekan  and
Mehrab Lotfpour
Afshin Nafari
Affiliation:
School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran 1417614418, Iran
Mehdi Malekan*
Affiliation:
School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran 1417614418, Iran
Mehrab Lotfpour
Affiliation:
School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran 1417614418, Iran
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Effects of adding different amounts of SiCp on the microstructure and mechanical properties of the as-cast and as-extruded Mg–7% Zn–1.5% Cu (ZC71) alloys were studied. The as-cast ZC71 alloy consisted of α-Mg phase that encircled with the MgZnCu and Mg(Zn,Cu)2 intermetallics. Hot extrusion has led to a grain-refined structure with distributed intermetallics along the extrusion direction. Adding SiCp decreased the grain size values for the as-extruded composites. The Vickers hardness values increased with SiCp addition for both conditions. The ultimate tensile strength and tensile elongation (El%) values reached the optimum level with 5 wt% SiCp addition. More SiCp additions led to more agglomerations and decrement in strength and elongation. The yield tensile strength also increased with SiC additions. Adding 5 wt% SiCp changed the brittle fracture to the more quasi-cleavage. Hot extrusion altered the fracture mode to more ductile for all composites.

Keywords

Mg alloyhot extrusionSiC particlesmicrostructuremechanical properties
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 21 , 14 November 2019 , pp. 3707 - 3716
Copyright
Copyright © Materials Research Society 2019 

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