Paper Titles
The Precipitate-Nucleation in the Vicinity of Solubility Limit
p.139
Deformation Modes and Anomalous Strengthening of Ni3X -Type Intermetallic Compounds with the Geometrically Close-Packed Structure
p.145
Characterization of Grain Boundaries in Recrystallized L12-Type Intermetallic Alloys
p.151
Atomic Mechanisms of Grain Boundary Motion
p.157
Transmission Electron Microscopy Observations on Cu-Ti Alloy Systems
p.163
Defect Structures and Room-Temperature Mechanical Properties of C15 Laves Phase in Zr-X-Cr (X:Nb, Ta and Hf) Alloy Systems
p.169
Toughness of Welded Low Carbon Steels Containing Nitrogen (A Resolved Problem on Recycled Steels)
p.175
Application of Dual-Phase and TRIP Steels on the Improvement of Crashworthy Structures
p.181
In Situ TiB Reinforced Titanium Metal Matrix Composites Prepared by Spark Plasma Sintering
p.189

Transmission Electron Microscopy Observations on Cu-Ti Alloy Systems

Article Preview

Abstract:

Phase separation behaviors of a quenched Cu-3.0at%Ti alloy, as well as crystallographic structures of Cu-20.7at%Ti alloy have been studied using transmission electron microscopy. The furnacecooled Cu-20.7at%Ti alloy are composed of a-Cu4Ti (Ni4Mo-type) and b-Cu4Ti (Au4Zr-type) with the orientation relationship of (011)a//(110)b, [100]a//[001]b. As-quenched Cu-3.0at%Ti alloy showed a modulated structure with the modulation length of about 4 nm. When aged at 723K for 8 hr, the a-Cu4Ti phase emerges within the modulated or tweed-like microstructure. Prolonged aging results in the growth of the a-Cu4Ti particles and the loss of coherency. It is likely that asquenched Cu-3.0at%Ti alloy decomposes spinodally at 723K, followed by polymorphous ordering; though the present study did not exclude, as an alternative path, a decomposition mechanism based on the catastrophic nucleation.

You might also be interested in these eBooks
New Frontiers of Processing and Engineering in Advanced Materials View Preview

Info:

Periodical:

Materials Science Forum (Volume 502)

Pages:

163-168

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.502.163

Citation:

Cite this paper

Online since:

December 2005

Authors:

Rimi Nishio, Toyohiko J. Konno, Satoshi Semboshi

Keywords:

Age Hardening, Cu-Ti Alloy, Ordering, Spinodal Decomposition

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2005 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

References

[1] S. Nagarjuna and D. S. Sarma: J. Mater. Sci., Vol. 37 (2002), p. (1929).

Google Scholar

[2] S. Suzuki, K. Hirabayashi, H. Shibata, K. Mimura, M. Isshiki and Y. Waseda: Scripta Mater., Vol. 48 (2003), p.431.

Google Scholar

[3] W. A. Soffa and D. E. Laughlin: Prog. Mater. Sci., Vol. 49 (2004), p.347.

Google Scholar

[4] R. Knights and P. Wilkes: Acta Metall., Vol. 21 (1973), p.1503.

Google Scholar

[5] D. E. Laughlin and J. W. Cahn: Acta Metall., Vol. 23 (1975), p.329.

Google Scholar

[6] A. Datta and W. A. Soffa: Acta Metall., Vol. 24 (1976), p.987.

Google Scholar

[7] C. Borchers: Phil. Mag. A, Vol. 79 (1999), p.537.

Google Scholar

[8] T. Tsujimoto, K. Hashimoto and K. Saito: Acta Metall., Vol. 25 (1977), p.295.

Google Scholar

[9] R. P. Wahi and J. Stajer: Decomposition of Alloys: the Early Stages, P. Haasen, V. Gerold, R. Wagner and M. F. Ashby, ed., (Pergamon Press, Oxford 1984), Vol. p.165.

Google Scholar

[10] J. W. Cahn and J. E. Hilliard: J. Chem. Phys., Vol. 28 (1958), p.258.

Google Scholar

[11] M. Hillert: Acta Metall., Vol. 9 (1961), p.525.

Google Scholar

[12] J. W. Cahn: Acta Metall., Vol. 9 (1961), p.795.

Google Scholar

[13] Binary alloy phase diagrams, 2nd. ed., T. B. Massalski, ed., (ASM International, Materials Park 1990), Vol. 2, p.1494.

Google Scholar

[14] H. U. Pfeifer, S. Bahn and K. Schubert: J. Less-Common Met., Vol. 14 (1968), p.291.

Google Scholar

[15] J. -Y. Brun, S. -J. Hamar-Thibault and C. -H. Allibert: Z. Metallkde, Vol. 74 (1983), p.525.

Google Scholar

[16] R. Sinclair, J. A. Leake and B. Ralph: phys. stat. sol., Vol. 264 (1974), p.285.

Google Scholar

[17] W. A. Soffa and D. E. Laughlin: Acta Metall., Vol. 37 (1989), p.3019.

Google Scholar

[18] A. J. Ardell and R. B. Nicholson: Acta Metall., Vol. 14 (1967), p.1295.

Google Scholar