Effect of Mg on nucleation process of recrystallization in Al–Mg–Si/SiCp composite

The recrystallization nucleation processes of two cold-rolled Al–Mg–Si/SiCp composites with different contents of Mg are investigated mainly by dynamic mechanical analyzer (DMA) and electron microscopy including high angle annular dark field scanning transmission electron microscopy (HAADF-STEM) and...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2016-10, Vol.26 (10), p.2561-2566
Main Authors: LI, Bin, LUO, Bing-hui, HE, Ke-jian, FAN, Wen-li
Format: Article
Language:English
Subjects:
aluminum matrix composites
dislocation
internal friction
microstructures
recrystallization
transmission electron microscopy
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Summary:The recrystallization nucleation processes of two cold-rolled Al–Mg–Si/SiCp composites with different contents of Mg are investigated mainly by dynamic mechanical analyzer (DMA) and electron microscopy including high angle annular dark field scanning transmission electron microscopy (HAADF-STEM) and high-resolution transmission electron microscopy (HRTEM). Internal friction and electron microscopy results show that solute atom clusters are present in association with dislocations in supersaturated cold-rolled composites. During recrystallization process, the internal friction peak position of Al–Mg–Si/3SiCp/2Mg (volume fraction, %) is higher than that of Al–Mg–Si/3SiCp (volume fraction, %) due to more solute atom clusters formed in association with the dislocations in the cold-rolled composite with a much higher Mg content, indicating a stronger resistance for the recrystallization nucleation.
ISSN:1003-6326
DOI:10.1016/S1003-6326(16)64382-0