TY - GEN
T1 - Transmission electron microscopy observations on Cu-Ti alloy systems
AU - Nishio, Rimi
AU - Konno, Toyohiko J.
AU - Semboshi, Satoshi
PY - 2005/1/1
Y1 - 2005/1/1
N2 - 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 furnace-cooled Cu-20.7at%Ti alloy are composed of Cr-Cu4Ti (Ni4Mo-type) and β-Cu 4Ti (Au4Zr-type) with the orientation relationship of (011)α//(110)β, [100]α//[001] β. 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 αCu4Ti phase emerges within the modulated or tweed-like microstructure. Prolonged aging results in the growth of the Ce-Cu4Ti particles and the loss of coherency. It is likely that as-quenched 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.
AB - 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 furnace-cooled Cu-20.7at%Ti alloy are composed of Cr-Cu4Ti (Ni4Mo-type) and β-Cu 4Ti (Au4Zr-type) with the orientation relationship of (011)α//(110)β, [100]α//[001] β. 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 αCu4Ti phase emerges within the modulated or tweed-like microstructure. Prolonged aging results in the growth of the Ce-Cu4Ti particles and the loss of coherency. It is likely that as-quenched 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.
KW - Age-hardening
KW - Cu-Ti alloy
KW - Ordering
KW - Spinodal decomposition
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U2 - 10.4028/0-87849-980-6.163
DO - 10.4028/0-87849-980-6.163
M3 - Conference contribution
AN - SCOPUS:35248852419
SN - 0878499806
SN - 9780878499809
T3 - Materials Science Forum
SP - 163
EP - 168
BT - New Frontiers of Processing and Eng. in Advanced Materials - Proc. of the Int. Conf. on New Frontiers of Process Science and Eng. in Advanced Materials, PSEA' 04 - The 14th Iketani Conference
PB - Trans Tech Publications Ltd
T2 - International Conference on New Frontiers of Process Science and Engineering in Advanced Materials, PSEA' 04
Y2 - 24 November 2004 through 26 November 2004
ER -