NDLI: Mechanical and Tribological Characterization of Al-Mg$_{2}$Si Composites After Yttrium Addition and Heat Treatment

Content Provider	Springer Nature Link
Author	Jafari dooshan, H. R. Liu, Wencai Wu, Guohua Bahrami, A. Pech Canul, M. I. Emamy, M.
Copyright Year	2014
Abstract	In this study, the effect of heat treatment and yttrium additions on the microstructure, mechanical properties, and tribological behavior of Al-15% Mg$_{2}$Si cast composites was investigated. The microstructural study revealed the presence of both primary and secondary Mg$_{2}$Si phases in all composite specimens and also Y-containing intermetallics (Al$_{2}$Y phases) at higher concentrations. It was also found that Y addition does not change the size and morphology of primary Mg$_{2}$Si particles considerably, but the pseudo-eutectic Mg$_{2}$Si changed from a flake-like morphology to fine fibrous or rod-like one. The results show that proper content of Y additions can reduce the amount of Mg$_{2}$Si phase through dissolving it into the matrix, lead to the precipitation of Al$_{2}$Y phase and improve the mechanical properties. Modified composites with 0.5% Y exhibited an ultimate tensile strength (UTS) of 290 MPa with an elongation of 4.3%. After exposing the composite to solution treatment at 520 °C for 4 h, the tensile strength of the composite continuously increased with the increase of Y content, and reached the maximum at 1% Y. The maximum UTS and elongation at room temperature for the heat-treated composites are 294 MPa and 7.4%, respectively. In the cast specimen, fracture surfaces are covered by packets with coarse steps, suggesting a brittle mode of failure. Modified composites with 0.5 wt.% Y contain several cracked particles together with a few decohered primary Mg$_{2}$Si particles. In solution heat-treated state, dimples present at the fracture surface are rather coarse but homogenous, showing a semi-ductile mode of fracture. Wear test results showed that the wear resistance of all specimens increases with the addition of Y up to 0.3 wt.%. Scanning electron microscopic observations of the worn surfaces revealed that the dominant wear mechanism was abrasive wear accompanied by some delamination wear mode.
Starting Page	1146
Ending Page	1156
Page Count	11
File Format	PDF
ISSN	10599495
Journal	Journal of Materials Engineering and Performance
Volume Number	23
Issue Number	4
e-ISSN	15441024
Language	English
Publisher	Springer US
Publisher Date	2014-02-22
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	casting mechanical properties metal-matrix composites (MMCs) wear Characterization and Evaluation of Materials Tribology, Corrosion and Coatings Quality Control, Reliability, Safety and Risk Engineering Design
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Mechanical Engineering

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