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Friction Stir Processing of Al-TiB<inf>2</inf> In Situ Composite: Effect on Particle Distribution, Microstructure and Properties
Date Issued
01-03-2015
Author(s)
Yadav, Devinder
Indian Institute of Technology, Madras
Abstract
Aluminum-based in situ composites suffer from the age-old issue of particle segregation along the grain boundaries after casting. In the present study, friction stir processing (FSP) was employed as a secondary process to improve the distribution of in situ formed TiB2 particles in Al-based composite. All the agglomerates of TiB2 were broken, and uniform distribution of particles was achieved after double-pass FSP. Also, FSP removed the casting defects and caused significant grain refinement of the Al matrix. The microstructure was characterized by equiaxed fine grains with average size of 3 µm and narrow grain size distribution. The microstructural refinements and homogenization after FSP not only enhanced the strength but also improved the ductility of the as-cast composite.
Volume
24