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金属学报(英文版) 1998
EFFECT OF SILICON ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF YTTRIUM MODIFIED Ni_3Al BASE ALLOY IC6Keywords: silicon,yttrium,Ni_3Al,microstructure,mechanical property Abstract: 1.IntroductionAdirectionallysolidifiedNi3AIbasealloyIC6hasbeenrecentlydevelopedinBIAMasahigh-temperaturestructuralmaterialusedforadvancedjet--enginebladesandvanesoperatinginthetemperaturerangeof1000mll50oC1].Thealloynotonlyhashighyieldstrengthandfairlygoodductilityfromroomtemperatureto1100"C,butalsohashighcreepresistanceinthetemperaturerangeof760--1100"C.Itsoxidationresistancehasbeensubstantiallyimprovedbytheadditionofproperamountsofsiliconandyttrium2--4].Siliconmaybeusedasrefiningaddit…
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