摘要
为了解决B_(4)C/Al复合材料制备过程中B_(4)C颗粒分布不均、团聚及易与Al基体发生剧烈反应的问题。本文采用选区激光熔化法制备了B_(4)C/Al复合材料,研究了激光功率和Ti元素对B_(4)C/Al复合材料微观组织和力学性能的影响。结果表明:B_(4)C/Al复合材料的致密度随激光功率的增大先增大后减少,激光功率240 W时致密度达到最大,为94.1%;制备过程中B_(4)C颗粒易与Al基体发生界面反应并且随激光功率增大而增大,形成界面产物Al_(3)BC和Al_(3)B_(48)C_(2)脆性相和微裂纹,导致界面结合性能降低;加Ti的B_(4)C/Al复合材料的致密度提高到95.2%,形成的界面产物TiC和TiB2能有效抑制界面反应,界面清晰完整,结合性能高,复合材料抗拉强度和伸长率分别提高41%、49.3%,拉伸断裂方式由脆性断裂转变为韧性断裂。
In order to solve the problems of uneven distribution of B_(4)C particles,agglomeration and violent reaction with Al matrix during the preparation of B_(4)C/Al composites.In this paper,B_(4)C/Al composites were prepared by selective laser melting method.The effects of laser power and Ti elements on microstructure and mechanical properties of B_(4)C/Al composites were studied.The results show that the density of B_(4)C/Al composites increases first and then decreases with the increase of laser power,and reaches the maximum density of 94.1%at 240 W.During the preparation process,B_(4)C particles are prone to interfacial reaction with Al matrix and increase with the increase of laser power,resulting in brittle phases and micro-cracks of Al_(3)BC and Al_(3)B_(48)C_(2),resulting in decreased interfacial bonding properties.The density of B_(4)C/Al composite with Ti increases to 95.2%,the resulting interface products TiC and TiB2 can effectively inhibit the interface reaction,and the interface is clear and complete with high bonding properties.The tensile strength and elongation of the composite are increased by 41%and 49.3%,respectively,and the tensile fracture mode changes from brittle fracture to ductile fracture.
作者
邓昀麒
胡启耀
DENG Yunqi;HU Qiyao(School of Aeronautical Manufacturing Engineering,Nanchang Hangkong University,Nanchang 330063,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2024年第6期3239-3247,共9页
Acta Materiae Compositae Sinica
基金
江西省自然科学基金面上项目(20192BAB206003)
校级“课程思政”示范课程建设经费(sz2218)
校级教改课题(JY21026)。
