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Martensitic Transformation Behaviors of Gas Atomized Ti50Ni30Cu20 Powders

Gas atomization으로 제조된 Ti50Ni30Cu20 합금 분말의 상변태 거동

  • 김연욱 (계명대학교 신소재공학과) ;
  • 정영수 (중앙대학교 토목공학과) ;
  • 최은수 (홍익대학교 토목공학과) ;
  • 남태현 (국립경상대학교 신소재공학부) ;
  • 임연민 (국립경상대학교 신소재공학부)
  • Received : 2011.01.01
  • Accepted : 2011.01.22
  • Published : 2011.02.28

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

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