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Metals 2017, 7(2), 56; doi:10.3390/met7020056

Effect of Preparation Parameter on Microstructure and Grain Refining Behavior of In Situ AlN-TiN-TiB2/Al Composite Inoculants on Pure Aluminum

Key Laboratory for New Type of Functional Materials in Hebei Province, School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
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Academic Editor: Hugo F. Lopez
Received: 4 January 2017 / Revised: 7 February 2017 / Accepted: 10 February 2017 / Published: 15 February 2017
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Abstract

The formation of in situ AlN-TiN-TiB2/Al composite inoculants, which contain multi-phase refiner particles including AlN, TiN, TiB2, Al3Ti, and α-Al, was investigated using nitrogen gas injection. The effects of the main preparation parameters such as nitriding temperature, nitriding time, Ti content in melts, on the microstructure and grain refinement of in situ AlN-TiN-TiB2/Al composite inoculants were studied. The shape, content and size of different ceramic particles in the inoculants can be tuned by controlling the nitriding temperature and time, inducing excellent refining and reinforcing effects on pure aluminum. As a result, the average grain size of pure aluminum can be reduced to about 122 ± 22 μm from original 1010 ± 80 μm by adding 0.3 wt % inoculants. The mechanical properties including the tensile strength, yield strength and microhardness of the refined as-cast pure aluminum are also improved. View Full-Text
Keywords: in situ Al matrix composite; inoculant; grain refinement; microstructure; aluminum in situ Al matrix composite; inoculant; grain refinement; microstructure; aluminum
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MDPI and ACS Style

Wang, Q.; Cui, C.; Wang, X.; Zhao, L.; Li, N.; Liu, S. Effect of Preparation Parameter on Microstructure and Grain Refining Behavior of In Situ AlN-TiN-TiB2/Al Composite Inoculants on Pure Aluminum. Metals 2017, 7, 56.

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