Journal
SCRIPTA MATERIALIA
Volume 187, Issue -, Pages 262-267Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2020.06.037
Keywords
Cast aluminum alloys; Grain refiner; CALPHAD; Al-Si-Ti-Nb-B system; Interface
Categories
Funding
- National Natural Science Foundation of China [51871138]
- Science and Technology Commission of Shanghai Municipality [1901050040 0]
- 111 project [D16002]
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A superior anti Si-poisoning Al-Ti-Nb-B refiner with Ti:Nb = 1:4 and M:B = 8:1 (M=Ti, Nb) was developed by a comprehensive data screening on the Al-10Si/Al-Ti-Nb-B system with thermodynamic calculations, by which the refinement level for Al-10Si alloys was upgraded to 109 similar to 125 mu m, significantly extending the grain size tailoring scope for the aluminum casting industry. The synergistic effect of Ti/Nb not only bestowed an appreciable amount of high-potency aluminides during solidification but also formed NbB2-TiB2 core-shell structure which created an effective diboride substrate for nucleating alpha-Al. These results shed new lights on designing innovative anti Si-poisoning refiners by composition engineering. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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