Paper Title:
Transmission Electron Microscopy Observations on Cu-Ti Alloy Systems
  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.

  Info
Periodical
Edited by
Masaaki Naka and Toshimi Yamane
Pages
163-168
DOI
10.4028/www.scientific.net/MSF.502.163
Citation
R. Nishio, T. J. Konno, S. Semboshi, "Transmission Electron Microscopy Observations on Cu-Ti Alloy Systems ", Materials Science Forum, Vol. 502, pp. 163-168, 2005
Online since
December 2005
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