An Investigation on Grain Refinement Mechanism of Master Alloys Al-Ti, Al-TiC and Al-Ti-C Toward Pure Aluminum

Wan Wu Ding; Jiang Tao Zhu; Wen Jun Zhao; Tian Dong Xia

doi:10.4028/www.scientific.net/AMR.652-654.1072

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An Investigation on Grain Refinement Mechanism of Master Alloys Al-Ti, Al-TiC and Al-Ti-C Toward Pure Aluminum

Abstract:

The grain refining effects of Al-Ti, Al-TiC and Al-Ti-C master alloys on commercially pure aluminum were compared, and the grain refinement mechanism of TiAl₃ and TiC among master alloys was discussed. The results show that: the grain refinement of the master alloys Al-TiC and Al-Ti toward pure aluminum mainly stems from the heterogeneous nucleation role of TiC and TiAl₃ particles, but with the extension of heat preservation time of fused mass, its role of heterogeneous nucleation will decline due to dissolution of TiAl₃ and aggregation and precipitation of TiC. The preferable grain refinement effects of Al-Ti-C master alloys toward pure aluminum are mainly due to the fact that when TiAl₃ and TiC particles are acted commonly as heterogeneous nucleation particles, the heterogeneous nucleation effect of TiC particles will be enhanced because of the presence of TiAl₃.

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Periodical:

Advanced Materials Research (Volumes 652-654)

Pages:

1072-1075

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.652-654.1072

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Online since:

January 2013

Authors:

Wan Wu Ding, Jiang Tao Zhu, Wen Jun Zhao, Tian Dong Xia

Keywords:

Al-Ti Master Alloy, Al-TiC Master Alloy, Al-Ti-C Master Alloy, Grain Refinement Mechanism, TiAl₃, TiC

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