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Vol.38, No.9, 1147 ~ 1153, 2000
Title
A Study on the Shape Memory Effect of Co-X%Ni Alloys
신한철Han Chul Shin,이상현Sang Hyun Lee,전중환Joong Hwan Jun,최종술Chong Sool Choi
Abstract
Shape memory effect(SME) and martensitic transformation kinetics of Co-X%Ni alloys were studied. SME decreased with increasing nickel content, and the SME was proportional to the initial ε martensite content, suggesting that the SME of the Co-X%Ni alloys is associated with coalescence of the pre-existing ε plates. Thermal cycling(ε↔α) increases the ε martensite content, and the SME becomes larger with increasing number of thermal cycles. The martensitic transformation kinetics of the Co-X%Ni alloys can be expressed as Y=1-exp[-0.00526(M_s-25)], where Y is volume fraction of ε martensite, and M_s is the martensite start temperature.
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