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Vol.40, No.7, 717 ~ 723, 2002
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| Title |
| Research Papers / Transformations : Phase Transformation Behavior and Shape Memory Characteristics of Ti-Ni-Cu Alloy Ribbons Fabricated by Melt Spinning |
| 김재훈Jae Hoon Kim,최미선Mi Seon Choi,이희우Hee Woo Lee,김태준Tae Joon Kim,김연욱Yeon Wook Kim,남태현Tae Hyun Nam |
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| Abstract |
| Phase transformation behavior and shape memory characteristics of Ti-Ni-Cu alloy ribbons fabricated by melt spinning have been investigated by means of differential scanning calorimetry, X-ray diffraction, optical microscopy and thermal cycling tests under constant load. With increasing linear velocity and decreasing ejection pressure, transformation start temperatures of ribbons decreased and stability of the B19 martensite was lowered, comparing to those of alloys fabricated by conventional casting since the cooling rate increased. Only after heat treating ribbons at temperatures higher than 873 K where recrystallization occurred, the B19 martensite was observed in Ti-40Ni-10Cu alloy ribbons. Transformation elongation and hysteresis associated with the B2-B19 transformation in Ti-Ni-Cu alloy ribbons decreased with increasing Cu-content, which was attributed to the decrease in lattice deformations. Transformation elongations of ribbons were larger than those of alloys made by casting, which was closely related to a texture developed in ribbons. |
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