Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Effect of Aging Treatment Temperature on Surface Modifications in Ni-Ti alloy

Ni-Ti합금의 표면개질에 미치는 시효처리 온도의 영향

  • Park, J.M. (School of Materials Science and Engineering Hongik University) ;
  • Kim, W.C. (School of Materials Science and Engineering Hongik University)
  • 박제민 (홍익대학교 과학기술대학 금속공학과) ;
  • 김완철 (홍익대학교 과학기술대학 금속공학과)
  • Published : 2009.11.30
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Abstract

Nickel titanium shape memory alloys (NiTi) have been investigated for applications in the biomedical industry. However, little is known about the influences of surface modifications on the propertise of these alloys. The effect of electropolishing and heat treatments was found to exhibit significant surface roughness. Change of phase was B2, r-phase and B19' by heat treatments. In this study, effect of the electropolishing conditions on surface roughness is investigated in Ni-Ti alloys (Nitinol). Variation in phases with heat treatment temperature is investigated for a Ni-Ti alloy by X-ray diffraction and DSC. Characteristic of the microstructure have been observed by SEM. Surface roughness have been measured by AFM. The results clearly show that significant different in surface property to heat treated at $500^{\circ}C$ (R-phase). $TiO_2$ phases preciritated all of the specimens. It is not good effect of surface roughness because made to surface relief. The surface roughness appears to be important in the property of Ni-Ti alloys for biomedical applications.

Keywords

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