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분말야금법으로 제조된 Ni-Al 합금의 열탄성 마르텐사이트 변태 및 변형특성
김영도,Wayman, C Marvin 대한금속재료학회(대한금속학회) 1991 대한금속·재료학회지 Vol.29 No.9
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.