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Grain Structure and Precipitates in Squeeze Casting Al-Li-Mg-Zr Alloy

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Abstract:

Grain structure and precipitates in squeeze casting Al-Li-Mg-Zr alloy for aircraft industry were investigated in heat treated condition, using X-ray diffraction, optical microscopy and transmission electron microscopy. An ultra fine grained structure in sub-micrometer size was obtained, having fine nanograins in it with polycrystalline diffraction rings that are different from the single-crystal patterns in the matrix. Ultra fine grain areas are generally located on the grain boundaries and sub-grain boundaries. In addition, TEM observations indicates the presence of lenticular δ' (Al3Li) phases that symmetrical distributed around the GP zones. The alloy also contains spherical β' (Al3Zr) dispersoids, and S1 (Al2MgLi) phases.

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Periodical:

Advanced Materials Research (Volumes 887-888)

Pages:

329-332

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.887-888.329

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Online since:

February 2014

Authors:

Li Fan*, Zhong Wei Chen, Qi Tang Hao

Keywords:

Al-Li Alloy, Grain Structure, Precipitate, Squeeze Casting

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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