Ti-Nb-Zr-Ta 합금계에서 냉각속도와 시효처리에 따른 미세조직의 변화가 내식성에 미치는 영향

Metadata Downloads
Issued Date
In recent years there has been a significant development of novel implant alloys based on β-Ti such as Ti-Nb-Zr and Ti-Nb-Zr-Ta alloy systems. Also, the use of titanium and its alloy as biomaterial is increasing due to its low modulus, superior biocompatibility and corrosion resistance when compared to conventional stainless steel and cobalt-based alloys. The purpose of this study is to investigate the microstructure variation, phase transformation behavior and corrosion characteristics of Ti-29Nb-4.3Zr-xTa alloys. Four kinds of alloys containing Ta concentrations of 5, 10, 15, and 20(wt%) were used to investigate the microstructure, corrosion resistance and others. The specimens were solution treatment in the β phase field of Ti alloy and followed by water quenching(WQ). Optical microscopy, FE-SEM(Field emission scanning electron microscope), X-ray diffraction, and a Vickers hardness test were performed to investigate the microstructure variation and corrosion resistance for each alloy under different cooling rate and Ta addition conditions. Concentrations corrosion resistance was studied by anodic polarization test. Fine needle-like traces of martensite were observed at the prior β grain boundary in the image of Ti alloys(Ti-29Nb-4.3Zr-xTa).
Also, α´(hexagonal)martensite and β phase peaks were observed in the XRD profile; this, α´(hexagonal)martensite and β duplex phase structures were revealed. When aged at 780 ℃/WC, the hardness increased slightly. This was considered to be related to the βTa, βZr precipitation in the grain boundary. In addition, the anodic polarization curves of Ti-29Nb-4.3Zr-xTa(x=5, 10, 15) alloys which were age treated specimen at 780 ℃/AC move to the left and upwards. It causes excellent pitting resistance and corrosion resistance.
Alternative Title
Effects on Corrosion Resistance in Variation of Microstructure by Cooling Rate and Aging Treatment in Ti-Nb-Zr-Ta Alloy System
Alternative Author(s)
Yoo, Sang-Eun
조선대학교 대학원
일반대학원 치의학과
Awarded Date
Table Of Contents
제 1 장 서론 = 1
제 2 장 이론적 배경 = 3
제 1절 생체용 Ti 합금의 열처리 = 3
제 2절 생체의료용 Ti 합금의 분류와 원소의 영향 = 3
제 3절 생체의료용 합금 = 7
제 4절 전기화학적 부식속도의 측정방법 = 14
제 3 장 실험방법 = 26
제 1절 실험재료 = 26
제 2절 Ti 합금 제조 = 26
제 3절 용체화처리(solutiontreatment)및 시효처리(agingtreatment) = 27
제 4절 생체용 Ti 합금의 미세조직 특성 = 27
제 5절 생체용 Ti 합금의 전기화학적 부식 = 28
제 4 장 실험 결과 및 고찰 = 29
제 1절 생체용 Ti 합금의 용체화 처리에 따른 조직의 특성 = 29
제 2절 생체용 Ti 합금의 시효 및 냉각속도에 따른 미세조직의 특성 = 32
제 3절 생체용 Ti 합금에서 Ta 첨가량에 따른 석출물의 변화 = 38
제 4절 생체용 Ti 합금의 시효 및 냉각속도에 따른 경도의 변화 = 46
제 5절 시효처리 및 냉각조건에 따른 결정구조의 변화 = 48
제 6절 생체용 Ti 합금의 공식(pitting) 및 부식특성 평가 = 50
제 5 장 결론 = 57
참고문헌 = 59
조선대학교 대학원
유상은. (2007). Ti-Nb-Zr-Ta 합금계에서 냉각속도와 시효처리에 따른 미세조직의 변화가 내식성에 미치는 영향.
Appears in Collections:
General Graduate School > 4. Theses(Ph.D)
Authorize & License
  • AuthorizeOpen
  • Embargo2007-11-13
Files in This Item:

Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.