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.
Highlights
Inoculation treatment is a traditional casting technology to refine the microstructure of castings in the field of aluminum alloys
TiB2/Al composite inoculants were prepared via gas injection method to research the influence of the the influence of the nitriding temperature, nitriding time, Ti content and stirring device on the nitriding temperature, nitriding time, Ti content and stirring device on the microstructure and grain microstructure and grain refinement of in situ AlN-TiN-TiB2 /Al composite inoculants
The refining effect of in situ AlN-TiN-TiB2 /Al composite inoculants increases with the increase of the content of TiB2, AlN, and TiN particles and the decrease of the size of the Al3 Ti phase
Summary
Inoculation treatment is a traditional casting technology to refine the microstructure of castings in the field of aluminum alloys. The preparation and processing of inoculants alloys, whichroles determines both macro and micro structure of the inoculants, are very particles play important for the inoculation behavior of composite inoculants [14]. 2 /Al in situ AlN-TiN-TiB composite the inoculants wereofdeveloped via the gas injection method Recently, in our previous work [15].2/AlHowever, influence typical preparation parameters method in our previous work. Five in situ AlN-TiNsitu AlN-TiN-TiB2 /Al composite inoculants were prepared via gas injection method to research. TiB2/Al composite inoculants were prepared via gas injection method to research the influence of the the influence of the nitriding temperature, nitriding time, Ti content and stirring device on the nitriding temperature, nitriding time, Ti content and stirring device on the microstructure and grain microstructure and grain refinement of in situ AlN-TiN-TiB2 /Al composite inoculants. Refinement of in situ AlN-TiN-TiB2/Al composite inoculants
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