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Study on Fracture Behaviour and High Temperature Mechanical Properties of TiB2P/6061Al Composite

Author: ZhouZhiZuo
Tutor: JiangLongTao
School: Harbin Institute of Technology
Course: Materials Physics and Chemistry
Keywords: TiB2/Al Hot extrusion Fracture toughness Fracture mechanism High-temperature tensile
CLC: TB331
Type: Master's thesis
Year: 2009
Downloads: 90
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Abstract


In this paper, the pressure Infiltration volume fraction of 15% , 20% and 25 % TIB - 2P / 6061Al composite , and the hot extrusion processing . Optical microscopy, scanning electron microscopy ( SEM ) , transmission electron microscopy ( TEM ) and universal tensile testing machine and other analytical testing methods on the microstructure, fracture behavior of composite materials and high-temperature mechanical properties of a systematic study to explore the TIB 2P < / sub > / 6061Al composite fracture mechanism and enhance the body content , hot extrusion , fracture toughness and high temperature mechanical properties of the composite , the results showed that : the TiB 2 < / sub > particles in 6061 distribution matrix with increasing volume fraction of particles tends to be uniform . The extruded composites dense particles to be further improved uniformity . Hot extrusion can greatly improve the the TiB 2P / 6061Al composite fracture toughness of the extruded composite the material K IC < / sub > with TiB 2 < / sub > particles content increased first and decreased trend . Squeezed state 20 % TIB - 2P < / sub > / 6061Al composite fracture toughness value of 20.9MPa · m 1/2 . TiB 2P / 6061Al composite fracture process : first TiB 2 particles depleted District , preparation of defects (such as holes, etc. ) , as well as areas of stress concentration and microcracks , micro- crack propagation is blocked due to stress concentration at the crack tip area in front of the initiation of further large amounts of crack , the crack propagation through these cracks mutual bridging connected with the main crack and lead to the final fracture of the composite material . The TiB 2P / 6061Al composite micro - crack initiation mechanism for the 6061Al alloy matrix near the interface crack, crack growth mechanism of micro-cracks mutual bridging . Hot extrusion can be effectively improved the TiB 2P < / sub > / 6061Al high temperature tensile properties of composite materials , high-temperature tensile strength improve With the TiB 2 < / sub > particle content increase , with increasing temperature rises. Elongation of the composite material with increasing temperature first increased and then decreased law , maximum 200 ° C tensile elongation .

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