Journal
MATERIALS CHARACTERIZATION
Volume 106, Issue -, Pages 62-69Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2015.05.019
Keywords
Metal matrix composites; Friction stir processing; Mechanical properties; Microstructures
Categories
Funding
- National Natural Science Foundation of China [51174098, 51201071]
- Doctoral Foundation of Jiangsu University [1281220014]
- Open Project of Key Laboratory for Ecological-Environment Materials of Jiangsu Province [EML201208]
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In this paper, Al3Ti/A356 composites fabricated by in situ casting were subjected to multi-pass friction stir processing (FSP) with 100% overlap. The microstructure and mechanical properties before and after FSP were investigated. The as-cast specimen, consisting of coarse matrix grains, high porosity, and interwoven acicular Si particles and Al3Ti clusters, exhibited the lower tensile properties. After multi-pass FSP, both the strength and ductility of the composite samples gradually enhanced. This was attributed to the combined effect of grain refinement, porosity removal, and refined Al3Ti and Si particles' uniform dispersion. The maximum strength and elongation achieved in 4-pass FSPed composite were substantially improved to approximate 1.64 and 2.52 times those of the as-cast composite. Quantitative analysis of the strengthening mechanism in the FSPed samples indicated that grain refinement, instead of Orowan strengthening, contributed more and more to the yield strength of the composites as the number of FSP passes was increased. (C) 2015 Elsevier Inc. All rights reserved.
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