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Preparation and Microstructure of In Situ CaB 6 –Al 4 Ca/Al Composite Inoculant Ribbon and Its Refining and Modifying Effect on Al–10Si–0.3Mg Alloy
Author(s) -
Sun Yijiao,
Cui Chunxiang,
Ding Jinhua,
Shi Jiejie,
Liu Shuiqing,
Cui Sen,
Liu Renchen
Publication year - 2018
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201800687
Subject(s) - ingot , materials science , alloy , ribbon , metallurgy , microstructure , refining (metallurgy) , melt spinning , composite material , fiber
The Al–B–Ca alloy ingot is prepared by arc‐melting with Al–3B and Al–10Ca master alloys and the in situ CaB 6 –Al 4 Ca/Al composite inoculant ribbon is carried out through melt‐spinning of Al–B–Ca alloy ingot. Afterwards, Al–B–Ca alloy ingot and CaB 6 –Al 4 Ca/Al inoculant ribbon are added into the melt of Al–10Si–0.3Mg alloy as inoculants to verify their refining and modifying effects, respectively. It is found whether in Al–B–Ca alloy ingot or CaB 6 –Al 4 Ca/Al inoculant ribbon, CaB 6 particles have a cubic shape. Compared to the micron‐sized CaB 6 particles in the ingot, the size of CaB 6 particles in the ribbon can reach to subnanoscale and nanoscale level. With the same amount of addition, CaB 6 –Al 4 Ca/Al inoculant ribbon has a better refining effect than Al–B–Ca alloy ingot, but both of them have similar modifying effects for eutectic silicon. In addition, the mechanical properties of Al–10Si–0.3Mg alloy inoculated by the ribbon are superior to that of Al–10Si–0.3Mg alloy inoculated by the ingot. The mismatch between CaB 6 and Al is particularly small and certain orientation relationships are existed between them. Therefore, the impact of CaB 6 particle size on refining effect of the inoculants, the heterogeneous nucleation mechanism of CaB 6 , and the strengthening mechanism of Al–10Si–0.3Mg alloy after inoculation are investigated.