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Effect of Hot Extrusion on the Microstructure of In Situ TiB2 Particulate Reinforced Magnesium Matrix Composite

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Abstract:

The TiB2/AZ31 magnesium matrix composite was fabricated via self-propagating hightemperature synthesis (SHS) and then hot extruded. The influence of hot extrusion on the microstructure and property of TiB2/AZ31 composites was investigated. The results show that hot extrusion and synthesized TiB2 particles could refine the grain size obviously. The synthesized TiB2 particles are micro- and nano-sized, dispersing homogenously in the matrix. The interface between the matrix and the particles are good bonding. Meanwhile, slip and twinning are the main deformation modes during the hot extrusion. The fracture surface of hot-extruded TiB2/AZ31 magnesium matrix composite has more dimples than the as-cast AZ31 magnesium alloy. The improvement of microstructure seems to be beneficial for the fracture ductility of TiB2/AZ31 magnesium matrix composite.

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Periodical:

Materials Science Forum (Volumes 675-677)

Pages:

473-476

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.675-677.473

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Online since:

February 2011

Authors:

N.N. Wu, C.F. Fang, Yun Bai, L.G. Meng, Hai Hao, Xing Guo Zhang

Keywords:

Hot Extrusion, Magnesium Matrix Composite, Self-Propagation High-Temperature Synthesis (SHS), TiB2 Particle

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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