Effects of Particle Volume Fraction on Dynamic Deformation Behaviors of B₄C Reinforced Aluminum Matrix Composites

Abstract:

Particles size grading method was employed to fabricate aluminum matrix composites reinforced with 75% volume fraction B4C particles by squeeze casting. Dynamic behaviors of the composite was investigated and compared with 55 vol. % composite which were reinforced with particles of uniform size. The results showed that the flow stress increased but the fracture strain decreased with increasing reinforcement volume fraction. Furthermore, the dynamic behaviors of 55 vol. % composite were significantly affected by adiabatic heating softening which was demonstrated by the local melted matrix on the fracture surface and an increase-decrease tendency on flow stress and failure strain was obtained with increasing impact velocity. However, due to load redistribution caused by particles size grading, no melted region was found on the fracture surface and no increase-decrease tendency on flow stress and failure strain was observed for 75 vol. % composites under the same impact loading.

• Periodical: Advanced Materials Research (Volumes 535-537)
• Pages: 110-116
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.535-537.110
• Online since: June 2012
• Authors: Xian Feng Li, Bin Liu, Wen Mao Huang, Hao Wei Wang
• Keywords: B₄C, Dynamic Behavior, Mechanical Property, Metallic Composites

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