Strengthening mechanism of B_4C@APC/Al matrix composites reinforced with bimodal-sized particles prepared by hydrothermal carbonized deposition on chips

作     者：Yingjie He Hongyu Xu Yang Liu Yihan Chen Zesheng Ji Yingjie He;Hongyu Xu;Yang Liu;Yihan Chen;Zesheng Ji

作者机构：School of Material Science and Chemical EngineeringHarbin University of Science and TechnologyHarbin 150040China Energy and Environment Engineering InstituteNanchang Institute of TechnologyNanchang 330044China College of ElectricalEnergy and Power EngineeringYangzhou UniversityYangzhou 225127China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2022年第123卷第28期

页      面：60-69页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 

基　　金：financially supported by the National Natural Science Foundation of China(No.51704087) the Natural Science Foundation of Heilongjiang Province(No.LH2020E083) 

主　　题：Bimodal-sized particle enhancement Micron-sized B_4C@APC core-shell spheres Al matrix composites Strengthening mechanism 

摘      要：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.