Microstructure of In Situ Particles/7055Al Matrix Composites with Deep Cryogenic Treatment

Abstract:

Al2O3，Al3Ti and Al3Zr particles reinforced 7055 aluminium matrix composites were fabricated via melt reaction method. The volume fraction is controlled at about 4-5%. After extrusion and solution-aging heat treatment the sample was prepared for deep cryogenic treatment, The microstructure and evolution of mechanical properties of (Al3Ti+Al3Zr)p/7055 composites were analyzed using optical microscopy(OM),scanning electronic microscopy(SEM) and X-ray diffraction(XRD). Some θ(Al2Cu) phases with nanometer size precipitate in the inner grain. As some grains preferred orient the intensity of some main diffraction peaks increase. Compared with those of as-cast and squeezed states the micro hardness has increased by 16.8% and 10.0% separately.

• Periodical: Applied Mechanics and Materials (Volumes 217-219)
• Pages: 114-118
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.217-219.114
• Online since: November 2012
• Authors: Xun Yin Zhang, Gui Rong Li, Ting Wang Zhang, Lei Cao, Hong Ming Wang, Jun Jie Wang, Kai Xuan Gu, Hong Zhang, Xiao Jing Xu
• Keywords: Aluminum Matrix Composite (AMC), Deep Cryogenic Treatment, Mechanical Property, Structure Evolution

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