CAJ | 학술논문

采用放电等离子体烧结工艺制备体积分数分别为15％、35％、55％和75％的β-锂霞石/Al复合材料(Euc/Al).为防止Euc颗粒和Al基体之间的界面反应,将Euc颗粒表面进行ZnO涂覆处理.采用光学显微镜、透射电镜、X射线衍射和热膨胀仪对Euc/Al复合材料的微观组织、相成分和热膨胀性能进行测试和分析.在复合材料中,由于大的各向异性残余应力的作用,形成Euc颗粒的亚稳相.对复合材料进行去应力退火处理后,复合材料中的Euc亚稳相发生逆转变,其对复合材料的热膨胀行为产生显著影响.
채용방전등리자체소결공예제비체적분수분별위15％、35％、55％화75％적β-리하석/Al복합재료(Euc/Al).위방지Euc과립화Al기체지간적계면반응,장Euc과립표면진행ZnO도복처리.채용광학현미경、투사전경、X사선연사화열팽창의대Euc/Al복합재료적미관조직、상성분화열팽창성능진행측시화분석.재복합재료중,유우대적각향이성잔여응력적작용,형성Euc과립적아은상.대복합재료진행거응력퇴화처리후,복합재료중적Euc아은상발생역전변,기대복합재료적열팽창행위산생현저영향.
The aluminum matrix composites with 15％,35％,55％ and 75％ (volume fraction) of β-eucryptite (Euc) particles were prepared by spark plasma sintering (SPS) process.To prevent the interfacial reaction between Euc and Al,ZnO was coated on the surface of Euc particles.The microstructures of Euc/Al composites were studied by optical microscope (OM) and transmission electron microscope (TEM).The phase compositions in the composite were studied by X-ray diffraction method.The thermal physical properties of Euc/Al composites were analyzed by means of thermal dilatometer.A metastable phase of Euc was discovered which may be produced by the high anisotropic residual stress in the composite.The metastable phase of Euc can transfer to normal Euc when the residual stress is relaxed by stress relief annealing process and has great influence on the CTE behavior of the Euc/Al composite.