Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
권호 표지
DOI QR코드

DOI QR Code

TEM Diffraction Analysis of Metastable Phases in Beta Ti Alloys

베타 티타늄합금의 준 안정상 TEM 회절도형 분석

  • Choe, Byung Hak (Dept. of Metal and Materials Engineering, Gangneung-Wonju National University) ;
  • Shim, Jong Heon (Dept. of Metal and Materials Engineering, Gangneung-Wonju National University) ;
  • Kim, Seung Eon (Titanium Alloy Department, Korea Institute of Materials Science) ;
  • Hyun, Yong Taek (Titanium Alloy Department, Korea Institute of Materials Science) ;
  • Park, Chan Hee (Titanium Alloy Department, Korea Institute of Materials Science) ;
  • Kang, Joo-Hee (Materials Modeling & Characterization Department, Korea Institute of Materials Science) ;
  • Lee, Yong Tai (Titanium Alloy Department, Korea Institute of Materials Science) ;
  • Kim, Young Ouk (ERICA Analytical Instrumentation Center, Hanyang University)
  • 최병학 (강릉원주대학교 신소재금속공학과) ;
  • 심종헌 (강릉원주대학교 신소재금속공학과) ;
  • 김승언 (재료연구소 타이타늄연구실) ;
  • 현용택 (재료연구소 타이타늄연구실) ;
  • 박찬희 (재료연구소 타이타늄연구실) ;
  • 강주희 (재료연구소 재료설계분석연구실) ;
  • 이용태 (재료연구소 타이타늄연구실) ;
  • 김영욱 (한양대학교 에리카공동기기원)
  • Received : 2015.05.22
  • Accepted : 2015.07.23
  • Published : 2015.08.27
Download PDF
⟨ Previous Next ⟩

Abstract

Metastable phase characteristics of beta Ti alloys were investigated to consider the relationship of the microstructure and diffraction pattern in TEM. TEM analysis showed that the microstructure was mottled as a modulated structure, and the diffraction pattern was composed of spot streaks between the main spots of a stable beta phase with a specific lattice relationship. The modulated structure may be induced by short distance slip or atom movement during a very short interval of solution treated and quenched (STQ) materials. The athermal ${\omega}$ phase, which could be precipitated at low temperature aging, is also analysed by the metastable phase. The metastable phases including athermal ${\omega}$ phase had a common characteristic of hardened and brittle behavior because the dislocation slip was restricted by a super lattice effect due to short distance atom movement at the metastable state.

Keywords

References

  1. T. W. Duerig and J. C. Williams, in Proceeding of Beta. Titanium Alloys in the 1980's, (eds.) R. R. Boyer, H. W. Rosenberg, 19 (1984).
  2. T. W. Duerig G. T. Terlinde and J. C. Williams, in Proceeding of the 4th Int'l Conference on Titanium '80 Sci. Technol, 2, 1299 (1980).
  3. B. H. Choe, S. C. Lee, S. J Kim and Y. T. Lee, Scripta Materialia, 39(6), 749 (1998). https://doi.org/10.1016/S1359-6462(98)00187-0
  4. B. H. Choe, B. H. Lee, J. H. Lee, T. H. Lee, C. G. Lee, S. J. Kim and Y. T. Lee, Met. Mater. Int., 7(6), 551 (2001). https://doi.org/10.1007/BF03179253
  5. B. H. Choe, S. K. Shin, Y. O. Kim, Y. T. Hyun, S. E. Kim and Y. T. Lee, Met. Mater. Int., 11(5), 365 (2005). https://doi.org/10.1007/BF03027506
  6. A. Devaraj, Ph. D Thesis thesis of Univ. of North Texas, (2011).
  7. I. M. Robertson and C. M. Wayman, Philos. Mag. A, 48(3), 42 (1983).
  8. B. H Lee, B. H. Choe, S. J. Kim, S. E. Kim and Y. T. Lee, Korean J. Met. Mater., 38(10), 1304 (2000).
  9. S. J. Kim, B. H. Choe and M. Hagiwara, Korean J. Met. Mater., 35(7), 1304 (1997).
  10. F. Prima, P. Vermaut, G. Texier, D. Anse and T. Gloriant, Scripta Materialia, 54(4), 645 (2006). https://doi.org/10.1016/j.scriptamat.2005.10.024
  11. R. B. Neder and T. Proffen, Diffuse Scattering and Defect Structure Simulations, Oxford University Press (2008).
  12. A. T. Zayak, Ph. D Thesis of University at Duisburg-Essen, (2003).