双峰晶粒尺寸分布的室温塑性研究ppt课件

双峰晶粒尺寸分布的ncNi基合金的室温塑性研究,虢婷2014-3-30,双峰结构,WANGYM.MAE.ThreestrategiestoachieveuniformtensiledeformationinananostructuredmetalJ.ActaMaterialia2004,52:1699-1709.,控制晶粒尺寸,背景,hightensileductility65%elongationtofailure,and30%uniformlongation.,WANGY,CHENM,ZHOUF,MAE.HightensileductilityinananostructuredmetalJ.Nature2002,419:912-915.,rollingtheCuatliquidnitrogentemperature,180for3min,200for3min,X.Shenetal./MaterialsScienceandEngineeringA487(2008)410416,Twodistinguishedstrainratesensitivity(0.016and0.045)andflowstressactivationvolume(26b3and11b3)wereobtainedatnormalandhighstrainrateandlowstrainrate,respectively.,goodductilityof5.611.3%,C.Guetal./ScriptaMaterialia54(2006)579584,14401916MPa,双峰结构是否都能提高塑性？,M.J.N.V.Prasadetal./MaterialsScienceandEngineeringA503(2009)8691,Y.M.Wangetal./ScriptaMaterialia51(2004)10231028,那么，可以从那几个方面来提高纳米晶的塑性呢？,粗晶是否能有效弱化nc的应力集中？,M.J.N.V.Prasadetal./MaterialsScienceandEngineeringA503(2009)8691,nanoscalevoidsornano/microcracks,大小晶粒体积分数及尺寸分布,WANGY,CHENM,ZHOUF,MAE.HightensileductilityinananostructuredmetalJ.Nature2002,419:912-915.,highstresses,activated,conventionalCu-dislocationpileupsatthetwinboundaries,GUOHE*etal./naturematerials|VOL2|JANUARY2003,dendrites,isolatingthehighlylocalizedshearbands,L.Zhuetal./ActaMaterialia60(2012)57625772,2010博士论文吉林大学纳米晶镍及镍钴合金,我的实验,34m,Cu,Ni,下一步实验计划,1.制备nc,m以及两个双层NiFe合金四个试样，双层的即在nc上面镀制近一个微米的微米层。2.对其中一个双层结构进行180退火3h，并