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Materials 2014, 7(2), 1188-1200; doi:10.3390/ma7021188
Article

Effect of Al–5Ti–C Master Alloy on the Microstructure and Mechanical Properties of Hypereutectic Al–20%Si Alloy

,
* ,
 and
School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China
* Author to whom correspondence should be addressed.
Received: 11 June 2013 / Revised: 8 February 2014 / Accepted: 10 February 2014 / Published: 14 February 2014
(This article belongs to the Special Issue Light Alloys and Their Applications)
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Abstract

Al–5Ti–C master alloy was prepared and used to modify hypereutectic Al–20%Si alloy. The microstructure evolution and mechanical properties of hypereutectic Al–20%Si alloy with Al–5Ti–C master alloy additions (0, 0.4, 0.6, 1.0, 1.6 and 2.0 wt%) were investigated. The results show that, Al–5Ti–C master alloy (0.6 wt%, 10 min) can significantly refine both eutectic and primary Si of hypereutectic Al–20%Si alloy. The morphology of the primary Si crystals was significantly refined from a coarse polygonal and star-like shape to a fine polyhedral shape and the grain size of the primary Si was refined from roughly 90–120 μm to 20–50 μm. The eutectic Si phases were modified from a coarse platelet-like/needle-like structure to a fine fibrous structure with discrete particles. The Al–5Ti–C master alloy (0.6 wt%, 30 min) still has a good refinement effect. The ultimate tensile strength (UTS), elongation (El) and Brinell hardness (HB) of Al–20%Si alloy modified by the Al–5Ti–C master alloy (0.6 wt%, 10 min) increased by roughly 65%, 70% and 51%, respectively, due to decreasing the size and changing the morphology on the primary and eutectic Si crystals. The change in mechanical properties corresponds to evolution of the microstructure.
Keywords: Al–5Ti–C master alloy; hypereutectic Al–20%Si alloy; modification; primary Si; eutectic Si; mechanical properties Al–5Ti–C master alloy; hypereutectic Al–20%Si alloy; modification; primary Si; eutectic Si; mechanical properties
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Ding, W.; Xia, T.; Zhao, W.; Xu, Y. Effect of Al–5Ti–C Master Alloy on the Microstructure and Mechanical Properties of Hypereutectic Al–20%Si Alloy. Materials 2014, 7, 1188-1200.

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