Journal
MATERIALS CHARACTERIZATION
Volume 62, Issue 9, Pages 865-877Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2011.06.007
Keywords
A1-B4C metal matrix composites; Friction stir welding; Microstructural characterization; EBSD technique; Grain structure; Ion beam polishing
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Funding
- NSERC Industrial Research Chair in Metallurgy of Aluminum Transformation at the University of Quebec at Chicoutimi
- Rio Tinto Alcan
- NRC-Aluminium Technology Centre
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Aluminum based metal matrix composites (MMCs) have been used in various automobile, aerospace and military industries. Yet characterization of the microstructure in these materials remains a challenge. In the present work, the grain structure in the matrix of B4C particulate reinforced MMCs and their friction stir welds is characterized by using optical metallography and the electron backscatter diffraction (EBSD) technique. Optical metallography can partially reveal the grain structure in the matrix of AA1100-16 vol.% B4C composite. The EBSD technique has been successfully applied to characterize the grain structure in the AA1100-16 vol.% B4C friction stir welds, which provides a powerful tool to follow the rnicrostructural evolution of MMC materials during friction stir welding (FSW). Both mechanical polishing and ion beam polishing are used for the EBSD sample preparation. The effect of the sample preparation on the EBSD data acquisition quality is studied. Some typical examples, such as the identification of grains and subgrains, grain size distribution, deformation fields and the texture components are given. (c) 2011 Elsevier Inc. All rights reserved.
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