铝基复合材料多道次搅拌摩擦沉积层组织和力学性能研究  

The microstructure and mechanical properties of the multi-pass friction-stir deposited aluminum matrix composite

作　　者：何宾 祝弘滨 王斯佳 崔雷[1] HE Bin;ZHU Hongbin;WANG Sijia;CUI Lei(School of Materials Science and Engineering,Tianjin University,Tianjin 300350,China;CRRC Industrial Institute Co.,Ltd.,Beijing 100070,China)

机构地区：[1]天津大学材料科学与工程学院,天津300350 [2]中车工业研究院有限公司,北京100070

出　　处：《轨道交通材料》2024年第6期1-7,共7页Materials for Rail Transportation System

基　　金：国家基金优秀青年科学基金项目(52322408)。

摘　　要：采用SiC颗粒体积分数20%的铝基复合材料进行多道次搅拌摩擦沉积工艺试验,分别对铝基复合材料多道次沉积层的宏观成形、微观组织特征和道间搭接接头拉伸性能进行测试,分析工艺参数对沉积层力学性能的影响规律。经过搅拌摩擦沉积后,沉积层中的SiC颗粒尺寸减小,分布更加均匀。提高转速或降低轴肩高度能够增加轴肩工具对沉积材料的摩擦、挤压作用,有利于提高沉积层的成形质量和力学性能,沉积层微观组织的再结晶使其力学性能显著提高,道间搭接界面不存在弱连接缺陷。该研究可为搅拌摩擦沉积技术生产铝基复合材料零部件的运用和推广提供研究基础和参考。Aluminum matrix composite with a 20%SiC particle volume fraction is used for multi-pass friction stir deposition process experiments.The macro-forming,microstructure characteristics and tensile strength of the multi-pass-deposition layer of aluminum matrix composite materials are tested,and the influence of process parameters on the mechanical properties of the deposition layer is analyzed.After stir friction deposition,the size of SiC particles in the deposited layer decreases and their distribution becomes more uniform.Increasing the rotational speed or reducing the height of the shaft shoulder can increase the friction and compression effect of the shaft shoulder tool on the deposited material,which is beneficial for improving the forming quality and mechanical properties of the deposited layer.The recrystallization of the microstructure of the deposited layer significantly improves its mechanical properties,and there are no weak bonding defects at the interlayer overlap interface.This study can provide a research basis and reference for the application and promotion of friction stir deposition techhniques for the production of aluminum matrix composite components.

关 键 词：铝基复合材料 搅拌摩擦沉积 微观组织 力学性能 

分 类 号：U270.4[机械工程—车辆工程] U270.64[交通运输工程—载运工具运用工程]