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《ACTA METALLRUGICA SINICA》 1999-09
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THE MICROSTRUCTURE OF A DIRECTIONALLOY SOLIDIFIED NiAl-Cr(Mo)-Hf ALLOY

CHEN Yuxi; CUI Chuanyong; HE Lianlong; GUO Jianting, LI DouxingLaboratory of Atomic Imaging of Solids, Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110015Correspondent: CHEN Yuxi, Tel. (024)23843531-55243Manuscript received 1999-  
The microstructure of a directionally solidified NiAl-28Cr-5.5Mo-0.5Hf eutectic alloyhas been investigated by TEM. The eutectic alloy has a typical cellular structtire and is composed of threephases which are NiAl matrix, layered Cr(Mo) phase, discontinuously distributed heusler phase Ni2AlHf.There is a cube-cube crystallographic relation between NiAl and Cr(Mo) phases and their grawth directionis (111). The interface between two phases is semi-coherent, at which three sets of interface dislocationsexist. Two kinds of NiAl precipitate were found in Cr(Mo) phase,whereas the precipitation of Cr(Mo) phasewas also found in NiAl matrix. Occationally, a cube-cube crystallographic relation was found betweenHeusler phase Ni2AlHf and NiAl phase.
【Fund】: 国家自然科学基金!9831020,59895156 59871055
【CateGory Index】: TG146
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