Effects of Reinforcement Content and Homogenization Treatment on the Microstructure and Mechanical Properties of in‑situ TiB_(2)/2219Al Composites  

作　　者：Linwei Li Donghu Zhou Kai Zhao Lifeng Jiang Huijun Kang Enyu Guo Feng Mao Zongning Chen Tongmin Wang 

机构地区：[1]Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province),School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China [2]Ningbo Institute of Dalian University of Technology,Ningbo 315000,China [3]National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials,Henan University of Science and Technology,Luoyang 471003,China [4]Longmen Laboratory,Luoyang 471000,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2024年第8期1421-1437,共17页金属学报（英文版）

基　　金：supported by the National Key Research and Development Program of China(No.2022YFB3400142);the National Natural Science Foundation of China(Nos.52174356,52022017,51927801,51971051,51901034 and U22A20174);the Science and Technology Plan Project of Liaoning Province(Nos.2022010005-JH6/1001 and 2022JH2/1013);the Innovation Foundation of Science and Technology of Dalian(Nos.2020JJ25CY002 and 2020J12GX037);the Major Science and Technology Projects of Longmen Laboratory(No.231100220400);the Fundamental Research Funds for the Central Universities.

摘　　要：Obtaining an appropriate grain size is crucial for Al alloys or Al matrix composites prior to processing,as it significantly influences the mechanical properties of components and workability during the manufacturing process.TiB_(2)particles are exceptional grain refiners in Al and serve as excellent reinforcement particles for particulate-reinforced aluminum matrix composites.However,the optimal particle content for achieving excellent refinement and strengthening effects depends on the matrix composition and requires further investigation.Additionally,homogenization is essential for mitigating the element segregation in the ingot.Although it is anticipated that adding suitable particles can effectively inhibit undesired grain growth during homogenization,comprehensive investigations on this aspect are currently lacking.Therefore,TiB_(2)/2219Al matrix composites with varying reinforcement contents(0,1,3,5 wt%)were fabricated through traditional casting followed by homogenization treatment to address these research gaps.The effects of reinforcement content and homogenization treatment on the microstructure and mechanical properties of in-situ TiB_(2)/2219Al composites were investigated.The results demonstrate a gradual strengthening of the refining effect with increasing particle concentration.Moreover,composites containing 3 wt%TiB_(2)particles exhibit superior comprehensive mechanical properties in both as-cast and homogenized state.Additionally,potential orientation relationships are observed and calculated between undissolved Al_(2)Cu eutectic phase and submicron or nanometer-sized TiB_(2)particles,resulting in a mixture structure with enhanced bonding strength.This mixture structure is continuously distributed along grain boundaries during solidification,forming a three-dimensional cellular network that acts as primary retarding forces for grain growth during homogenization.Furthermore,the established homogenization kinetic equations were further utilized to analyze the correlation between homogenization tim

关 键 词：TiB_(2)/2219Al matrix composite Reinforcement content Homogenization treatment Homogenization kinetic Cellular structure Mechanical property 

分 类 号：TB33[一般工业技术—材料科学与工程]