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http://dx.doi.org/10.3740/MRSK.2015.25.8.403

TEM Diffraction Analysis of Metastable Phases in Beta Ti Alloys  

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)
Publication Information
Korean Journal of Materials Research / v.25, no.8, 2015 , pp. 403-409 More about this Journal
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
Ti alloy; metastable phase; TEM microstructure; diffraction pattern; lattice relationship; super lattice effect;
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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).   DOI   ScienceOn
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).   DOI
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).   DOI   ScienceOn
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).   DOI   ScienceOn
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).