Grain Refinement Mechanism and Effective Nucleation Phase of Al-5Ti-1B Master Alloy

Shun Cheng Wang; Ji Lin Li; Chun Lei Gan; Kaihong Zheng

doi:10.4028/www.scientific.net/MSF.898.1231

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HomeMaterials Science ForumMaterials Science Forum Vol. 898Grain Refinement Mechanism and Effective...

Grain Refinement Mechanism and Effective Nucleation Phase of Al-5Ti-1B Master Alloy

Abstract:

The Al-5Ti-1B, Al-10Ti, Al-4B master alloys and TiB₂ powder were applied to refine the pure aluminum, respectively. The effects of the TiAl₃phase, TiB₂ particle, and AlB₂ phase on the grain size of pure aluminum were compared. The grain refinement mechanism of the Al-5Ti-1B grain refiner was studied. The results showed that the TiAl₃ phase was an effective heterogeneous nucleus of the α-Al grain. But the TiAl₃ phase in the Al-5Ti-1B grain refiner was not the heterogeneous nucleus of the α-Al grain due to its re-melting in the Al melt. The separate TiB₂ particle or AlB₂ phase was not the heterogeneous nucleus of the α-Al grain. However, the TiB₂coated by the TiAl₃ phase can be the effective heterogeneous nucleus of the α-Al grain. The grain refinement mechanism of the Al-5Ti-1B grain refiner can be summarized as follows: when the Al-5Ti-1B grain refiner is added into the Al melt, the TiAl₃ phases are re-melted to release the Ti atoms, while the TiB₂ particles are remaining in the Al melt. During the solidification of the Al melt, the Ti atoms are segregating on the surface of TiB₂ particles to form the TiAl₃phases. The TiB₂ particles coated by the TiAl₃ phases then reacts with the Al melt to generate α-Al crystal nucleus.

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Materials Science Forum (Volume 898)

Pages:

1231-1235

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.898.1231

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Online since:

June 2017

Authors:

Shun Cheng Wang*, Ji Lin Li, Chun Lei Gan, Kaihong Zheng

Keywords:

Al-5Ti-1B Refiner, Grain Refinement, Heterogeneous Nucleation

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