Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
권호 표지

The Effect of Ageing on the Transformation Behavior of Ti-50.4at.% Ni Alloy(II)

Ti-50.4at.%Ni합금의 변태거동에 미치는 시효처리의 영향(II)

  • Kim, Sung-Jin (Department of Materials Science and metallurgical Engineering Kumoh National Institute of Technology) ;
  • Woo, Heung-Sik (Department of Safety Engineering, Dongguk University) ;
  • Park, Sung-Bum (Department of Materials Science and metallurgical Engineering The graduate school of Kumoh National Institute of Technology)
  • 김성진 (금오공과대학교 재료금속공학과) ;
  • 우흥식 (동국대학교 안전공학과) ;
  • 박성범 (금오공과대학교 대학원 재료금속공학과)
  • Published : 2005.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

The shape memory effect in Ti-50.4at.%Ni alloy after solution treatment at 1273K for 2h and aged at 350, 450, $550^{\circ}C$ for 0.5, 1, 1.5, 2, 4, 10hrs had been investigated by differential scanning calorimetry measurement. It was found that ageing in the temperature range of $350^{\circ}C{\sim}550^{\cric}C$ induced complex transformation behavior, involving the R-phase and multiple-stage martensitic transformation. Usually aged Ni-rich NiTi alloys undergo martensitic transformation on cooling from high temperatures in two step : Austenite to R-phase and then R-phase to Martensite (normal behavior). In sample aged at $350^{\circ}C$ two distinct DSC peaks arised giving evidence of intermediate stages of martensite transformation. This results in the nucleation and growth of coherent $Ni_4Ti_3$-precipitate. These explain all features of the evolution of DSC charts during ageing including the number of distinct DS peaks and their positions.

Keywords

References

  1. K.otsuka and C. Wayman, 'Shape Memory Materials', Cambridge University Press, pp. 27-45,1988
  2. 우흥식, 박성범, 강봉수, 김성진, 'Ti-50.lat.%Ni 합금의 변태거동에 미치는 시효처리의 영향(I)', 한국안전학회논문집, 제19권, 제4호, pp. 1-7, 2004
  3. Jiu-Song Zhu and R. Gotthardt, 'New phase transition peak in NiTi alloy', Physics Letters A, Vol. 132, Issue 5, pp. 279-282, 1988 https://doi.org/10.1016/0375-9601(88)90566-X
  4. D. Stroz, J. KWarciak, H. Morawiec, 'Effect of ageing on martensitic transformation in TiNi shape memory alloy', J. Mater. Sci., Vol. 23, pp. 4127- 4131, 1988 https://doi.org/10.1007/BF01106847
  5. H. Sehitoglu, A. Wagoner Johnson, H. S. Woo, R. Hamilton, H. J. Maier, Y. Chumlyakov, 'Detwinn ing and Hysteresis in NiTi Alloys', Nato International Workshop Metz, pp. 23-26, 2002
  6. H. Morawiec, D. Stroz, T. Goryczka, D. Chrobak 'Two-stage martensitic transformation in a deformedand annealed NiTi alloy', Scripta Materialia, Vol. 35, Issue 4, pp. 485-490, 1996 https://doi.org/10.1016/1359-6462(96)00179-0
  7. D. Stroz, 'Precipitation process in a deformed near equiatomic alloy', Journal de Physique III, No. 11, pp. 293-298, 1997
  8. H. Morawiec, D. Stroz, D. Chrobak, 'Effect of early stages of precipitation and recovery on the multistep transformation in deformed and annealed nearequiatomic NiTi alloy', Scripta Materialia, Vol. 48, pp. 571-576, 2003 https://doi.org/10.1016/S1359-6462(02)00475-X
  9. D. Favier, Y. Liu, and L. Oreas, 'Experimental Hysteresis of NiTi during ferroelasic and superelastic deformation', Journal de Physique III, No.11, pp. 477-481, 1997
  10. J. Khalil Allafi, X. Ren and G. Eggeler, 'The mechanism of multistage artensitic transformations in aged Ni-rich NiTi shape memory alloys', Acta Materialia, Vol. 50, Issue 4, pp. 793-803, 2002 https://doi.org/10.1016/S1359-6454(01)00385-8
  11. D, Treppmann, E. Hornbogen, D. Wurzel, 'The effect of recrystallization and precipitation processes on the functional and structural properties in TiNi Alloy', JOURNAL DE PHYSIQUE IV, Vol. 5,pp. 569-574, 1995
  12. J. Khalil Allafi, X. Ren and G. Eggeler, 'The mechanism of multistage martensitic transformations in aged Ni-rich NiTi shape memory alloys', Acta Mater., Vol. 50, pp. 793-803, 2002 https://doi.org/10.1016/S1359-6454(01)00385-8
  13. Y. Liu and D. Favier, 'Stability of ageing-inducedmultiple-stage transformation behavior in a Ti-50.15% Ni alloy', J. Phys. IV, Vol. 11, pp. 113-118, 2001
  14. H. Sitepu, W. Schmahl, J. Khalil Allafi, G. Eggeler, A. Dlouhy, D. M. Tobbens and M. Tovar, 'Neutron diffraction phase analysis during thermal cycling of a Ni-rich NiTi shape memory alloy using the Rietveldmethod', Scripta Mater., Vol. 46 pp. 543- 548, 2002 https://doi.org/10.1016/S1359-6462(02)00032-5
  15. E. hornbogen, V. Mertinger and D. Wurzel, 'Microstructure and tensile properties of two binary NiTialloys', Scripta Metall., Vol. 44, pp. 171-178, 2001 https://doi.org/10.1016/S1359-6462(00)00543-1
  16. P. Wollants, M. De Bonet and J. R. Roos, Metallkd., 'On the stress-dependence of the latent heat of transformation as related to the efficiency of a work performing cycle of a memory engine', Scripta Metall., Vol. 14, pp. 1217-1223, 1980 https://doi.org/10.1016/0036-9748(80)90260-4