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1、第33卷第4期礦冶工程V01.33№42013年O8月MININGANDMETALLURGICALENGINEERINGAugust2013攪拌摩擦加工制備顆粒增強(qiáng)鎂基復(fù)合材料①姚立群,張至柔,馮文彬,肖振宇,楊續(xù)躍’(1.深圳華加日鋁業(yè)有限公司,廣東深圳518052;2.中南大學(xué)材料科學(xué)與工程學(xué)院,湖南長沙410083;3.中南大學(xué)有色金屬材料科學(xué)與工程教育部重點(diǎn)實(shí)驗(yàn)室,湖南長沙410083)摘要:利用摩擦攪拌加工技術(shù),對(duì)AZ31鎂合金進(jìn)行表面組織細(xì)化、表面復(fù)合化。通過金相顯微鏡和掃描電鏡觀察研究攪拌摩
2、擦加工后的加工顯微組織及退火顯微組織,并測試加工區(qū)的硬度,發(fā)現(xiàn)摩擦攪拌區(qū)晶粒明顯細(xì)化,晶粒尺寸可降至幾微米,且復(fù)合化表面即使高溫長時(shí)間退火,組織依然穩(wěn)定;摩擦攪拌加工制備復(fù)合材料,分別添加納米Si,N粒子和SiO粒子復(fù)合于AZ31鎂合金表面,納米粒子均勻分布于合金表面,與未添加任何粒子的樣品相比,晶粒細(xì)化效果明顯提高,且由于復(fù)合粒子在基體中產(chǎn)生大量新界面,抑制了晶界遷移,使攪拌摩擦加工后的組織具有很高的熱穩(wěn)定性。關(guān)鍵詞:摩擦攪拌加工;鎂基復(fù)合材料;顆粒增強(qiáng);顯微組織;晶粒細(xì)化;表面復(fù)合化;熱穩(wěn)定性中圖分類
3、號(hào):TG146.2文獻(xiàn)標(biāo)識(shí)碼:Adoi:10.3969/j.issn.0253-6099.2013.04.028文章編號(hào):0253—6099(2013)04—0108一o4FabricationofParticulate-reinforcedMagnesiumMatrixCompositebyFrictionStirProcessingYAOLi.qun,ZHANGZhi.rOll。FENGWen—bin,XIAOZhen.yu,YANGXu.yue’。,(1.NonfemetInternational(
4、China-Canada—Japan)AluminiumCoLtd,Shenzhen518052,Guangdong,China;2.SchoolofMaterialsScienceandEngineering,CentralSouthUniversity,Changsha410083,Hunan,China;3.KeyLaboratoryofNonferrousMetalMaterialsScienceandEngineering,MinistryofEducation,CentralSouthUniv
5、ersity,Changsha410083,Hunan,China)Abstract:ThesurfacestructurerefinementandcompoundingofAZ31alloybyfrictionstirprocessing(FSP)werestudied.MetallographicmicroscopeandscanningelectronicmicroscopewereusedtoobservethemicrostructureofFSPedandannealedsamples,an
6、dthehardnessofthestirredalgawasmeasured.TheresultsshowthatanobviousrefinementofgrainsizewithintheFSPedregioncanbeobservedwithgrainsizereducedtomicrometers,andthestructureofcompositedsurfaceremainsstableevenafterlong—timeannealingathightemperature.Particul
7、ate—reinforcedcompositeswerepreparedbycompoundingnano—scaledparticlessuchasSi3N4andSiO2respectivelyintoAZ31matrixbyFSP.Duetoparticlesdistributedhomogeneouslyatthesurface,grainsizeisfinerthanthatoftheuncompoundedsamples.Furthermore,themigrationofthegrainbo
8、undaryisrestrainedbythenewboundariescreatedbythoseparticles,SOtheFSPedstructurepresentsahiglldegreeofthermalstability.Keywords:frictionstirprocessing;magnesiummatrixcomposite;particulatereinforcement;microstructure;