Journal
MATERIALS & DESIGN
Volume 47, Issue -, Pages 522-528Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2012.12.033
Keywords
Aluminium alloys; Grain refinement; Mechanical property
Categories
Funding
- National Natural Science Foundation of China [51071097, 51271101]
- National Basic Research Program of China [2012CB825702]
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A new Al-3Ti-1B-0.2C master alloy with uniform microstructure was prepared using a melt reaction method in this study. In the master alloy, TiB2 particles exhibit hierarchical dendritic morphology, while TiC particles doped with a trace amount of B show a polyhedral morphology. The grain refining performance of the master alloy on A356 alloy has also been investigated. It is found that the addition of 0.2 wt.% Al-3Ti-1B-0.2C master alloy can induce very effective grain refinement of the A356 alloy. The average grain size of alpha-Al is reduced to 167 +/- 8 mu m from about 1570 mu m and the grain refining efficiency does not fade obviously within 60 min. Therefore, the mechanical properties of the A356 alloy have been improved obviously by the addition of the Al-3Ti-1B-0.2C master alloy, including the ultimate tensile strength, yield strength and elongation. (C) 2013 Elsevier Ltd. All rights reserved.
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