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Shape Memory Characteristics and Mechanical Properties of Rapidly Solidified $Ti_{50}Ni_{20}Cu_{30}$ Alloy Strips  

Kim, Yoen-Wook (Dept. of Advanced Materials Engineering, Keimyung University)
Publication Information
Journal of Korea Foundry Society / v.29, no.5, 2009 , pp. 187-191 More about this Journal
Abstract
Microstructures and shape memory characteristics of $Ti_{50}Ni_{20}Cu_{30}$ alloy strips fabricated by arc melt overflow have been investigated by means of XRD, optical microscopy and DSC. The microstructure of as-cast strips exhibited columnar grains normal to the strip surface. X-ray diffraction analysis showed that one-step martensitic transformation of B2-B19 occurred in the alloy strips. According to the DSC analysis, it was known that the martensitic transformation temperature ($M_s$) of B2 $\rightarrow$ B19 in $Ti_{50}Ni_{20}Cu_{30}$ strip is $57^{\circ}C$. During thermal cyclic deformation with the applied stress of 60 MPa, transformation hysteresis and elongation associated with the B2-B19 transformation were observed to be $3.7^{\circ}C$ and 1.6%, respectively. The as-cast strip of $Ti_{50}Ni_{20}Cu_{30}$ alloy also showed a superelasticity and its stress hysteresis was as small as 14 MPa. These mechanical properties and shape memory characteristics of the alloy strips were ascribed to B2-B19 transformation and the controlled microstructures produced by rapid solidification of the arc melt overflow process.
Keywords
Shape memory alloy; Ti Ni Cu alloy; Martensitic transformation; Superelasticity; Transformation hysteresis;
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Times Cited By KSCI : 1  (Citation Analysis)
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