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Strengthening mechanism of b_4c@apc/Al matrix composites reinforced with bimodal-sized particles prepared by hydrothermal carbonized deposition on chips

引用

Journal of Materials Science & Technology 2022年第28期123卷 60-69页

作者： Yingjie He Hongyu Xu Yang Liu Yihan chen Zesheng Ji School of Material Science and chemical Engineering Harbin University of Science and TechnologyHarbin 150040China Energy and Environment Engineering Institute Nanchang Institute of TechnologyNanchang 330044China college of Electrical Energy and Power EngineeringYangzhou UniversityYangzhou 225127China

A b_(4)c@amorphous carbon(apc)/Al matrix composite was fabricated by using hydrothermal carbonized deposition on chips(HTcDc)process and solid-state synthesis *** microstructure and mechanical properties of the b_(4)c@apc/Al matrix composite were *** HTcDc process,nano-b_(4)c particles(50 nm)and micron-sized b_(4)c@apc core-shell spheres with a diameter of 2μm were found in the *** microhardness of the micron-sized b_(4)c@apc spheres is 1.66 GPa,which is greater than that of theα-Al matrix(1.06 GPa).Dislocation accumulation is observed around the micron-sized b_(4)c@apc spheres,indicating that the micron-sized b_(4)c@apc spheres have a strengthening effect on theα-Al *** to the formation of micron-sized b_(4)c@apc spheres,the reinforcement of nano-b_(4)c particles into the composites is transformed from single-sized particle enhancement to bimodal-sized particle *** strengthening mechanism for b_(4)c@apc/Al matrix composites with bimodalsized particles of nano-b_(4)c and micron-sized b_(4)c@apc spheres were analyzed,which includes thermal mismatch strengthening generated by the mismatch of coefficient of thermal expansion(cTE)between micron-sized b_(4)c@apc core-shell spheres andα-Al matrix,Orowan strengthening produced by nano-b_(4)c particles,Hall-Petch strengthening and load transfer strengthening produced by the bimodal-sized enhancement from nano and microspheres.A relationship model between the yield strength(YS)increment and the conversion rate(x)of micron-sized b_(4)c@apc core-shell spheres was estimated.

关键词： bimodal-sized particle enhancement micron-sized b_4c@apc core-shell spheres Al matrix composites Strengthening mechanism

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