快速凝固cu-fe系合金液态相分离的相场法模拟

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1、华中科技大学硕士学位论文weredifferent.ThatwasCrhadlittlesolubilityinCu-richphase,buthadacertainsolubilityin(Fe,Cr)-richphase.Incontrast,theconcentrationdifferenceofNiintwophaseswasrelativelysmall.The(Fe,Cr)-richparticlesweresphericalwhilethe(Fe,Ni)-richparticleswereirr

2、egular.OneofthereasonswastheadditionofCrincreasethecriticaltemperatureofmiscibilitygapinCu-Febasedsystem,whichledtothesufficienttimefor(Fe,Cr)-richparticlestogrowandcoarse.AnotherreasonwastheinterfacialenergybetweenparticlesandmatrixislargerinCu-Fe-Crsystem

3、.Themicrostructuresdeterminedbyexperimentsweresimilartothesimulatedresultsandprovedthevalidityofthem.Keywords:Cu-Febasedalloys;phaseseparation;phasefield;microstructure;alloyingelementsIII万方数据华中科技大学硕士学位论文目录摘要.................................................

4、..............................................................IAbstract...........................................................................................................II1绪论1.1研究背景...................................................................

5、..............................(1)1.2快速凝固条件下的液态相分离............................................................(2)1.3材料相变与微观结构的模拟方法........................................................(6)1.4Cu-Fe系合金液态相分离的研究现状................................................

6、(10)1.5本文研究内容.......................................................................................(13)2相场模型2.1相场模型的热力学基础......................................................................(15)2.2相场模型的动力学基础................................................

7、......................(18)2.3相场控制方程的推导..........................................................................(19)2.4相关参数...............................................................................................(21)2.5本章小结............................

8、...................................................................(22)3二元合金液态相分离的相场法模拟3.1成分对二元合金相分离的影响..........................................................(23)3.2温度对相分离过程的影响......................