Effect of Ultrasound on Microstructure and Tensile Properties of In Situ TiB_2p/7055 Composite Synthesized by Melt Direct Reaction

Abstract:

TiB₂/7055 composite was synthesized by a new melt direct reaction from 7055-(Al-3B)-Ti system with ultrasound. The phase composition and the microstructures of the as-prepared samples were investigated by XRD, SEM and EDS. The result shows that no Al₃Ti phase is in existence. With the assistance of ultrasound, grains are significant refined. Moreover, the wettability between matrix and particles is improved. The shapes of TiB₂ particles are mainly hexagonal or near-spherical, and the size is about 500nm. TiB₂ particles are with uniform distribution. Compared with 7055Al matrix alloy, the tensile strength of the composite reaches 303MPa, increased by 10.2%. However, the elongation is 7.3%, decreased by 4.8%.

• Periodical: Advanced Materials Research (Volume 1053)
• Pages: 129-135
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1053.129
• Online since: October 2014
• Authors: Xiao Jun Liu, Yu Tao Zhao, Song Li Zhang, Wei Li Lin
• Keywords: In Situ Composite, Melt Direct Reaction, Microstructure, Tensile Properties, Ultrasound

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