镍基单晶高温合金的制备与难熔元素对其熔体结构的影响

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1、上海交通大学硕士学位论文However,theself-diffusionofNideviatesfromtheArrheniuslawwiththeadditionofTa.ItisfoundthatthestructureofNi-TaalloyschangeswiththeadditionofTa.The15lm-typebondpairsdecreaseandthe14lm-typebondpairsincreasewiththeTaaddition.ThediffusioncoefficientofNiisalwayssmallerthanthatof

2、Ta.WiththeincreaseofTacontent,thediffusioncoefficientsofbothNiandTaatomsarenotmonotonicallydecreased,buthaveacertainrelationshipwiththecompositionofthesystem.KEYWORDS:FreckleinNi-basedsuperalloys,AIMD,refractoryelements,meltstructure,diffusion.IV万方数据上海交通大学硕士学位论文目录摘要··················

3、··············································································································IABSTRACT··················································································································III第一章绪论···········································

4、········································································11.1高温合金概述······································································································11.1.1高温合金发展概况······················································································

5、·11.2单晶高温合金概述······························································································31.2.1单晶高温合金发展·······················································································31.2.2单晶高温合金成分······························································

6、·························41.2.3镍基单晶合金中的相组成···········································································61.2.4镍基单晶合金强化机制···············································································81.3高温合金中的溶质再分配·························································

7、·························91.3.1平衡分配系数·······························································································91.3.2固相γ/γ′分配系数·················································································111.4雀斑················································

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