Aging of Melt Spun Ribbons in Cu-Based Shape Memory Alloys at High Temperature

Melt Spinning된 Cu-Al-Ni-X계 형상기억합금 리본의 고온시효

  • 최영택 (한국기계연구원 재료공정연구부)
  • Published : 1995.09.01

Abstract

The aging effects on the characteristics of the melt spun Cu based shape memory alloys have been investigated by the microhardness test, X-ray diffraction, differential scanning calorimetry, scanning electron microscopy and transmission electron microscopy. After aged for specific times, hardness of the ribbons began to increase and shape memory capacity diminished. At the initial stage of aging the austenitic transformation temperatures increased gradually, but at last became nearly constant: That is, the aging deteriorated the thermal stability. The increase in hardness was due to the formation of the $\gamma_2$ precipitates. The loss in the shape memory capacity was due to the decrement of solute atoms in the matrix by the formation of the $\gamma_2$ precipitates. In this study, it was confirmed that Mn is an effective element for Improving the thermal stability.

Keywords

References

  1. Mater. Sci. Eng. v.A129 P.Rodriguez;G.Guenin
  2. Metals Forum v.4 D.P.Dunne;N.F.Kennon
  3. Metall. Trans. v.A13 N.F.Kennon;D.P.Dunne;L.Middleton
  4. Intern. Symp. on Shape Memory Metals D.Z.Yang;Z.G.Wei
  5. Intern. Symp. on Shape Memory Metals W.H.Zou;R.H.Wang;J.I.Gui;Q.L.Wang
  6. Intern. Symp. on Shape Memory Metals C.Y.Chung;C.W.H.Lam;J.K.L.Lai
  7. Intern. Symp. on Shape Memory Metals H.G.Peng;Z.G.Wei;D.Z.Yang
  8. Proc. ICOMAT-92 I.Hurtado;J.V.Humbeeck;M.Chandrasekaran;L.Delaey
  9. Proc. ICOMAT-92 J.H.Zhu;D.P.Dunne;G.W.Delamore;N.F.Kennon
  10. Acta. Metall. v.42 H.Morawiec;M.Gigla
  11. Acta. Metall. v.40 M.A.Morris
  12. 關西大學 工業技術硏究所硏究報告 v.9 K.Sugimoto
  13. 大韓金屬學會誌 v.26 박종관;정인상
  14. Script. Metall. v.15 M.A.Morris;S.Gunter
  15. 金屬 v.59 唯大次男
  16. 日本金屬學會誌 v.44 中村藤伸;楠井潤;淸水吉廣;高村仁一
  17. 日本金屬學會誌 v.51 三木雅道;萩野喜淸;平松泰
  18. 日本金屬學會誌 v.48 松岡才二;大嶋隆一郞;藤田英一