TiC-TiB_(2)_Al-xSi-4.5Cu复合材料的制备与性能.docxVIP

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第54卷 第9期

2025年5月

热加工工艺

HotWorkingTechnology

ISSN1001-3814CN61-1133/TG

DOI:10.14158/j.cnki.1001-3814. rjggy@

TiC-TiB2/Al-xSi-4.5Cu复合材料的制备与性能

梁艳峰,刘逍恂,夏峰,郭巧琴

(西安工业大学材料与化工学院,陕西西安710021)

摘要院根据TiB2与TiC原位粒子的形成温区袁设计粒子的原位反应路径袁在铸造Al-xSi-4.5Cu渊x=7袁2袁18袁wt%冤合金熔体内成功制备TiB2与TiC双相粒子遥借助OM尧SEM尧EDS等方法观察所制备的复合材料微观组织袁并测试其维氏硬度袁探究基体合金中Si含量对原位TiB2与TiC粒子分布及复合材料硬度的影响遥结果表明院3种Si含量的复合材料均可以通过原位自生法获得微纳米尺度的TiB2与TiC双相粒子袁但随着Si含量增加袁原位粒子在Si相附近团聚加剧曰当Si含量为12wt%时袁复合材料硬度达到极值袁为173.56HV曰当Si含量增加到18wt%时袁TiC粒子发生失稳分解袁导致了复合材料硬度下降遥

关键词院Al-Si-Cu合金曰Al基复合材料曰TiC曰TiB2曰原位自生法

中图分类号院TB333.1+2 文献标识码院A 文章编号院1001-3814(2025)09-0092-06

PreparationandPropertiesofTiC-TiB2/Al-xSi-4.5CuComposite

LIANGYanfeng,LIUXiaoxun,XIAFeng,GUOQiaoqin

(SchoolofMaterialsScienceandChemicalEnginering,XianTechnologicalUniversity,Xian710021,China)

Abstract院Anin-situreactionpathwayofparticleswasdesignedaccordingtotheformationtemperatureofTiB2andTiCin-situparticles,andTiB2andTiCdual-phasicparticleswerepreparedinAl-xSi-4.5Cu(x=7,12,18,wt%)castalloymelt.Themicrostructureofthepreparedcompositewasobservedbyusingopticalmicroscopy(OM),scanningelectronmicroscopy(SEM)energy-dispersivespectroscopy(EDS)methods,andtheVickershardnesswasalsotested.TheinfluenceofSi

contentofthematrixalloyonthedistributionofin-situTiB2andTiCparticlesandthehardnessofthecompositewasinvestigated.TheresultsshowthatTiB2andTiCdual-phasicparticlesinmicro-nanosizeareobtainedinthecompositewiththethreeSicontentsbyin-situsynthesismethod.AstheamountofSiincreases,thetendencyofin-situparticlesdistributedaroundSiphaseismoreaggravated.ThehardnessofTiC-TiB2/Al-12Si-4.5Cureachesthemaximumof173.56HV.However,whentheSicontentincreasesto18wt%,TiCparticlesarenotstableanddecompose,whichleadstoadecreas