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http://dx.doi.org/10.7777/jkfs.2011.31.1.026

Martensitic Transformation Behaviors of Gas Atomized Ti50Ni30Cu20 Powders  

Kim, Yoen-Wook (Dept. of Advanced Materials Eng., Keimyung University)
Chung, Young-Soo (Dept. of Civil Eng, Chungang University)
Choi, Eun-Soo (Dept. of Civil Eng., Hongik University)
Nam, Tae-Hyun (Division of Materials Eng., Gyeongsang National University)
Im, Yeon-Min (Division of Materials Eng., Gyeongsang National University)
Publication Information
Journal of Korea Foundry Society / v.31, no.1, 2011 , pp. 26-30 More about this Journal
Abstract
For the fabrication of bulk near-net-shape Ti-Ni-Cu shape memory alloys, consolidation of Ti-Ni-Cu alloy powders are useful because of their brittle property. In the present study, $Ti_{50}Ni_{30}Cu_{20}$ shape memory alloy powders were prepared by gas atomization and martensitic transformation temperatures and microstructures of those powders were investigated as a function of powder size. The size distribution of the powders was measured by conventional sieving, and sieved powders with the specific size range of 25 to $150\;{\mu}m$ were chosen for this examination. XRD analysis showed that the B2-B19 martensitic transformation occurred in the powders. In DSC curves of the as-atomized $Ti_{50}Ni_{30}Cu_{20}$ powders as a function of powder size, only one clear peak was found on each cooling and heating curve. The martensitic transformation start temperature($M_s$) of the $25-50\;{\mu}m$ powders was $31.5^{\circ}C$. The $M_s$ increased with increasing powder size and the difference of $M_s$ between $25-50\;{\mu}m$ powders and $100-150\;{\mu}m$ powders is only $1^{\circ}C$. The typical microstructure of the rapidly solidified powders showed cellular morphology and very small pores were observed in intercellular regions.
Keywords
Ti-Ni-Cu shape memory alloy; Gas atomization; Rapidly solidified powder; Martensitic transformation;
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