Advances in materials Research

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The effects of Mg2Si(p) on microstructure and mechanical properties of AA332 composite

  • Zainon, Fizam (Fracture and Damage Research Group, School of Mechatronic Engineering, Pauh Putra Campus, Universiti Malaysia Perlis) ;
  • Ahmad, Khairel Rafezi (Electrochemistry of Green Materials Research Group, Center of Excellence Geopolymer & Green Technology (CEGeoGTech), School of Materials Engineering, Universiti Malaysia Perlis) ;
  • Daud, Ruslizam (Fracture and Damage Research Group, School of Mechatronic Engineering, Pauh Putra Campus, Universiti Malaysia Perlis)
  • Received : 2016.01.27
  • Accepted : 2016.06.28
  • Published : 2016.03.25
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Abstract

This paper describes a study on the effects of $Mg_2Si_{(p)}$ addition on the microstructure, porosity, and mechanical properties namely hardness and tensile properties of AA332 composite. Each composite respectively contains 5, 10, 15, and 20 wt% reinforcement particles developed by a stir-casting. The molten composite was stirred at 600 rpm and melted at $900^{\circ}C{\pm}5^{\circ}C$. The $Mg_2Si$ particles were wrapped in an aluminum foil to keep them from burning when melting. The findings revealed that the microstructure of $Mg_2Si_{(p)}/AA332$ consists of ${\alpha}$-Al, binary eutectic ($Al+Mg_2Si$), $Mg_2Si$ particles, and intermetallic compound. The intermetallic compound was identified as Fe-rich and Cu-rich, formed as polygonal or blocky, Chinese script, needle-like, and polyhendrons or "skeleton like". The porosity of $Mg_2Si_{(p)}/AA332$ composite increased from 8-10% and the density decreased from 9-12% from as-cast. Mechanical properties such as hardness increased for over 42% from as-cast and the highest UTS, elongation, and maximum Q.I were achieved in the sample of 10% $Mg_2Si$. The study concludes that combined with AA332, the amount of 10 wt% of$Mg_2Si$ is a suitable reinforcement quantity with the combination ofAA332.

Keywords

Acknowledgement

Supported by : Malaysian Ministry of Higher Education

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