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Effect of Al-5Ti-1B Grain Refiner Addition on the Formation of Intermetallic Compounds in Al-Mg-Si-Mn-Fe Alloys

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Abstract:

The effect of Al-5Ti-1B grain refiner addition on solidification microstructure, especially the formation of the binary eutectic (Al)+Al15(Fe,Mn)3Si2 was investigated in Al-5Mg-2Si-0.7Mn-1.1Fe (wt.%) alloy. The experimental results showed that the solidification microstructure were consisted of primary α-Al phase, inter dendritic binary eutectic (Al)+Al15(Fe,Mn)3Si2, and ternary eutectic (Al+Mg2Si+Al15(Fe,Mn)3Si2). The heterogeneous nucleation of the primary (Al) phase in the alloys was greatly enhanced by the Al-5Ti-1B grain refiner, refining the (Al) grains significantly. The subsequent binary eutectic was nucleated on these refined (Al) phase. Consequently, the size of Al15(Fe,Mn)3Si2 phase with a Chinese script morphology in the binary eutectic was greatly refined, without much change in the secondary branch spacing.

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Periodical:

Materials Science Forum (Volumes 828-829)

Pages:

53-57

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.828-829.53

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Online since:

August 2015

Authors:

Zhong Ping Que*, Yun Wang, Y.P. Zhou, L. Liu, Z. Fan

Keywords:

Al-5Ti-1B, Binary Eutectic, Grain Refinement, Iron Containing Intermetallic Compound, Undercooling

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© 2015 Trans Tech Publications Ltd. All Rights Reserved

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