Abstract
Microstructure evolutions and degradations of aluminum-metal-matrix composites during fusion welding were studied and compared with thermodynamic calculations. In fusion welds of Al2O3-reinforced composites, the decomposition of Al2O3 was observed. In fusion welds of SiC whisker-reinforced composites, the decomposition of SiC to Al4C3+Si by reaction with molten aluminum occurred. These phenomena led to unacceptable fusion welds in aluminum metal-matrix composites. Successful welds were produced in the same composites by friction stir welding (FSW). Significant reorientation of SiC whiskers close to the boundary of the dynamically recrystallized and thermomechanically affected zone (TMAZ) was observed. The small hardening in the dynamically recrystallized region was attributed to the presence of dislocation tangles in between SiC whiskers.
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Storjohann, D., Barabash, O.M., David, S.A. et al. Fusion and friction stir welding of aluminum-metal-matrix composites. Metall Mater Trans A 36, 3237–3247 (2005). https://doi.org/10.1007/s11661-005-0093-4
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DOI: https://doi.org/10.1007/s11661-005-0093-4