Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 546, Issue -, Pages 146-152Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2012.03.042
Keywords
TiB2; Hypereutectic Al-Si alloy; Primary Si; Edge-to-edge model; Mechanical property
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Funding
- Graduate Independent Innovation Foundation of Shandong University (GIIFSDU)
- Independent Innovation Foundation of Shandong University [2010TS081]
- National Natural Science Foundation of China [51071097, 51001065]
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The hypereutectic Al-Si (A390) matrix composite reinforced with TiB2 particles was successfully prepared by Al melt reaction method. In the composite, TiB2 particles have a size range from 0.5 to 1.5 mu m and a block-like morphology. Some TiB2 particles are inside the primary Si, suggesting that they were engulfed during solidification. It is considered that TiB2 particles tend to be adsorbed into the primary Si, because of their high surface energy and strong adsorbability. Crystallographic analysis of TiB2 and Si was carried out with the edge-to-edge model. It is found that there exists good lattice matching coherence, which belongs to the matching planes and directions, < 1 1 2 >(Si)/< 1 0 (1) over bar 0)(TiB2), < 1 1 1 >(Si)/{0 0 0 1}(TiB2). Furthermore, T with 3 wt% TiB2 particles addition, the mechanical properties of the base alloy, including the ultimate tensile strength at 300 degrees C. percentage elongation and wear resistance, have been obviously improved. (C) 2012 Elsevier B.V. All rights reserved.
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