Transactions on Electrical and Electronic Materials

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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The B2-B19-B19' Transformation in Ti-(45-x)Ni-5Cu-xMn (at%) (x = 0.5-2.0) Alloys

  • Jeon, Yeong-Min (School of Materials Science and Engineering, Gyeongsang National University) ;
  • Kim, Min-Gyun (School of Materials Science and Engineering, Gyeongsang National University) ;
  • Kim, Min-Su (School of Materials Science and Engineering, Gyeongsang National University) ;
  • Lee, Yong-Hee (School of Materials Science and Engineering, Gyeongsang National University) ;
  • Im, Yeon-Min (School of Materials Science and Engineering, Gyeongsang National University) ;
  • Nam, Tae-Hyun (School of Materials Science and Engineering, Gyeongsang National University)
  • Received : 2010.12.10
  • Accepted : 2010.12.27
  • Published : 2011.02.28
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Abstract

Effect of substitution of Mn for Ni on transformation behavior, shape memory characteristics and superelasticity of Ti45Ni-5Cu alloy has been investigated by means of electrical resistivity measurements, X-ray diffraction, thermal cycling tests under constant load and tensile tests. The one-stage B2-B19' transformation occurred when Mn content was 0.5 at%, above which the two-stage B2-B19-B19' transformation occurred. A temperature range where the B19 martensite exists was expanded with increasing Mn content because decreasing rate of Ms (60 K / % Mn) was larger than that of Ms' (40 K / % Mn). Ti-(45-x)Ni-5Cu-xMn alloys were deformed in plastic manner with a fracture strain of 60 % ~ 32 % depending on Mn content. Clear superelasticity was found in fully annealed Ti-(45-x)Ni-5Cu-xMn alloys with Mn content more than 1.0 at%, which was ascribe to a solid solution hardening by substitution of Mn for Ni.

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