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时间:2020-04-23
《双相不锈钢中沉淀相平衡形貌及界面结构的原子尺度计算-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、第9期V_o1.50No.9第50卷舍属学跋2014年9月第l123—1127页ACTAMETALLURGICASINICASep.2014PP.1123—1127双相不锈钢中沉淀相平衡形貌及界面结构的原子尺度计算戴付志张文征f清华大学材料学院先进材料教育部重点实验室,北京100084)摘要根据实验测量的位向关系,利用原子尺度计算研究了双相不锈钢中杆状奥氏体沉淀相的平衡截面形貌.计算结果显示:沉淀相的平衡形貌含有2个主要择优刻面,且面积近似相等.因此,沉淀相计算截面形貌近似为菱形,与实验观察形貌基本吻合.通
2、过对计算结果的分析,给出了主要择优刻面上的具体位错结构,也与实验测量结果基本吻合.关键词形貌,界面能,界面结构,原子模拟,双相不锈钢中图法分类号TGll3.12,077文献标识码A文章编号0412.1961(2014)09—1123—05ANINVESTIGATIoNoNTHEEQUILIBRIUMMoR—PHoLoGYANDINTERFACIALSTRUCTURESoFPRICIPITTESINDUPLEXSTAINLESSSTEELBYAToMISTICSIMULATIoNDAIFuzhLZHANGWe
3、nzhengKeyLaboratoryofAdvancedMaterials(MOE),SchoolofMaterialsScienceandEngineering,TsinghuaUniversity,Beijing100084Correspondent:ZHANGWenzheng,professor,Tel:(o】o)62773795,Fax:(010)62771160,E-mail:zhangwz@tsinghua.edu.cnSupportedbyNationalNaturalScienceFoun
4、dationofChina(No.51171088)Manuscriptreceived2014—04—21,inrevisedform2014—05—20ABSTRACTAssortedmorphologiesofprecipitatesinfcc/bcctransformationsystemshavebeenreported,whichoftenexhibitirrationalcharacteristic.Variousmodelshavebeendevelopedtoexplainthehabit
5、plane(orthebroadfacet),buttheoverallmorphologiesoftheprecipitatesareseldomexplainedquantitatively.Inthiswork,theequilibriumcross..sectionofrod--shapeausteniteprecipitatesinduplexstainlesssteelisdeterminedbyatomisticsimulation.Theinputorientationrelationshi
6、p(0R)betweenfccandbccphaseisdeterminedaccordingtotheO-1inecriterion(oneoftheinterfacescontainsasinglesetofdislocations),withtheconditionthattheinvariant1ineliesinclose—packedplanepairof011)f~101)bandtheBurgersvectorofO·linesisf011]f/2t(111)b/2.TheobtainedO
7、RisclosetotheK-SOR((1li)f//(Oli)b,[101]f//(111)b),withthedeviationof1,27。fromtheparallelisminbothplanesanddirections.Interfacia1energyofinterfacesinvariousorientationsinthezoneaxisoftheinvariantline([0.750.100.65]f//[o.520.680.52]b)hasbeencalculated.Toensu
8、rethereliabilityofthecalculatedvalues,allini。tialatomicconfigurationfreeofinterstitialandvacancyisconstructedforeachinterface.TheenergiesoftheO-lineinterface,theinterfacenormaltoeitherAg1or△颤02o)arefoundtohav
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