粉体粒径级配比对粉末冶金SiCp／6061A1复合材料组织与性能的影响.docx

学兔兔www.xuetut

第20卷第5期Vol.20No.5

粉末冶金材料科学与工程

MaterialsScienceandEngineeringofPowderMetallurgy

2015年10月Oct.2015

粉体粒径级配比对粉末冶金SiCp16061AI复合材料组织与性能的影响

王爱琴，韩辉辉，谢敬佩，王文焱

(河南科技大学材料科学与工程学院，洛阳471023)

摘要：选择不同粒径的6061Al粉末和SiC颗粒，采用真空热压法制备含35%SiC体积分数的SiCp16061Al复合材料，研究不同级配比对复合材料显微组织和抗拉强度的影响。结果表明：复合粉末的粒径级配比可影响复合材料的微观组织和力学性能；当增强体颗粒粒径为15μm时，随基体6061粉末与SiC颗粒粒径比降低，SiC颗粒在复合材料中的分布越来越均匀，抗拉强度提高；当基体6061Al粒径为10μm时，随SiC颗粒粒径减小，复合材料微观组织的均匀性降低，但抗拉强度提高。并建立了理想的复合粉末颗粒分布模型，模型的理论计算结果与Slipenyuk公式计算结果接近。

关键词：SiC/6061复合材料；颗粒粒径；粒子分布模型；颗粒级配；抗拉强度

中图分类号：TG146.21文献标识码：A文章编号：1673-0224(2015)5-738-08

Effectofsizematchbetweenparticulatereinforcementand

matrixpowderonmicrostrucureandmechanicalproperties

ofPMSiCp/6061Alcomposites

WANGAi-qin,HANHui-hui,XIEJing-pei,WANGWen-yan

(CollegeofMaterialScienceandEngineering,HenanUniversityofScienceandTechnology,Luoyang471023,China)

Abstract:The35%SiCp/6061Alcompositeswerefabricatedbypowdermetallurgy(PM).SiCparticlewiththesizesof40,25,15and7.5μm,andAlpowderwiththeparticlesizesof60,30and10μmwereused.Theeffectofratiobetweenreinforcementparticleandmatrixsizesonmicrostructureandmechanicalpropertiesofthecompositewasinvestigated.Thetensilestrengthfordifferentsizematchwasstudied,andmicrostructurewasalsoobservedbySEM.TheresultsdemonstratethatSiCparticledistributesmoreuniformlyandtensilestrengthincreaseswithdecreasingthesizeratioof6061AlpowdertoSiCparticlewhenSiCsizeis15μm;andSiCparticledistributesmorenonuniformlybutthetensilestrengthincreaseswithdecreasingthesizeratioof6061AlpowdertoSiCparticlewhen6061Alsizeis10μm.SizematchofcompositepowdershasgreatinfluenceonthedistributionofSiCparticulatesinthecomposites,andthereforeonthemechanicalproperties.Theidealdistributionmodelofcompositepowdersisbuiltandthemodeling