高能超聲制備及其力學(xué)性能
(南京航空航天大學(xué) 材料科學(xué)與技術(shù)學(xué)院，南京 210016)
摘 要: 設(shè)計(jì)一套高能超聲攪拌裝置，并在氬氣氛保護(hù)下，通過對(duì)納米CeO2進(jìn)行預(yù)處理及控制工藝參數(shù)，用該裝置制備了CeO2質(zhì)量分?jǐn)?shù)分別為1%~6%的納米CeO2p/Zn-4.5%Al復(fù)合材料。用SEM觀察顆粒的分散情況，測(cè)試材料的室溫拉伸性能。結(jié)果表明：所設(shè)計(jì)的裝置結(jié)構(gòu)合理、超聲作用效果佳；納米CeO2可以單粒分散入基體合金中；隨著CeO2質(zhì)量分?jǐn)?shù)的增加，復(fù)合材料的抗拉強(qiáng)度和彈性模量明顯高于基體合金，伸長(zhǎng)率則降低；復(fù)合材料的斷裂機(jī)制為脆性斷裂。
關(guān)鍵字: 金屬基納米復(fù)合材料；納米CeO2；高能超聲攪拌法；力學(xué)性能
composite materials by high-power ultrasonic technology
（College of Materials Science and Technology, Nanjing University of Aeronautics & Astronautics,
Nanjing 210016, China）
Abstract:A suit of high-power ultrasonic stirring device was designed to prepare nano-CeO2p/Zn-4.5%Al composites with mass fraction from 1% to 6% through pretreating the reinforcement nano-CeO2 particulates and controlling proper process parameters. Reinforcement distribution was observed by SEM and tensile properties of the composites were tested at room temperature. The results show that the designed device has reasonable structure and well high-ultrasonic effect, and the nano-CeO2 can be homogenously mono-dispersed in the matrix. Compared with the matrix alloy, the tensile strength and elastic modulus of the composites increase obviously with the increment of mass fraction of particles, while the elongation decreases. The tensile fracture also shows that the damage mechanism of composites is brittle fracture.
Key words: metal matrix nanocomposites; nano-CeO2; high-power ultrasonic stirring technology; mechanical property
