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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

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Received: 11 June 2013; in revised form: 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 which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

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.

AMA Style

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(2):1188-1200.

Chicago/Turabian Style

Ding, Wanwu; Xia, Tiandong; Zhao, Wenjun; Xu, Yangtao. 2014. "Effect of Al–5Ti–C Master Alloy on the Microstructure and Mechanical Properties of Hypereutectic Al–20%Si Alloy." Materials 7, no. 2: 1188-1200.


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