발간논문

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Vol.36, No.5, 625 ~ 631, 1998
Title
The Effect of Point Defects on the Precipitation of Fe in NiAlFe Intermetallic Compounds
박희섭 , 고홍석 , 홍경태 , 이경섭 Hee Sub Park , Hong Seok Ko , Kyung Tae Hong , Kyung Sub Lee
Abstract
The influence of point defects on the precipitation was investigated in NiAlFe by means of magnetic susceptibility measurement, differential scanning calorimetry, microhardness and TEM analysis. The magnetic measurements revealed that the ferromagnetic phases consisting of Fe atoms precipitated rapidly at about 700K and dissolved completely at temperatures over 1000K in NiAl alloys containing Fe over 6 at.%. Formation energy of thermal vacancies in NiAlFe was determined to be about 0.85 eV through analysis of quenching data in the range of 1000K-1500K. TEM analysis indicated that very fine α-Fe particles were distributed uniformly in NiAl matrix. Superparamagnetic behaviors were attributed to Fe particles in NiAl12Fe. Only the stoichiometric NiAl containing Fe showed a significant increase in magnetic susceptibility during aging treatment. It is considered that she formation of Fe particles is not dependent on consitutional vacancy but thermal vacancy.
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