발간논문

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Vol.29, No.9, 960 ~ 967, 1991
Title
Transformation and Deformation Behavior of Thermoelastic Martensite Ni - Al Alloys Produced by Powder metallurgy Method
김영도 , C . Marvin Wayman Young Do Kim
Abstract
β-NiAl alloys represent protential structural materials for use at elevated temperatures because of high melting point, low density, and resistance to oxidation and high temperature deformation. NiAl alloys were prepared by powder metallurgy method using hot isostatic pressing and hot pressing techniques. This investigation focused on studying the transformation and deformation behavior of martensite in Ni-Al alloys produced by the powder metallurgy method for possible elevated temperature shape memory applications. The transformation behavior was investigated by electrical resistivity and dilatorneter measurements, and found to be thermoelastic. There is good agreement between the transformation temperaturca determined by dilatometer and electrical resistivity methods. Compression testing was performed to observe the deformation behavior of martensite. Detwinnig occurring from the external compressive stress is the main deformation mode for the NiAl martensite. Quantitative tests to determine the shape recovery were performed on compressed samples by measuring the dilation as a function of temperature after plastic deformation.
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