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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.46  No.6 (2005)  >  pp.1230-1234

MATERIALS TRANSACTIONS
<<Previous article Vol.46  No.6 (2005)   pp.1230 - 1234 Next article>>

Experimental and Computational Investigation of Formation of Precipitate Free Zones in an Al–Cu Alloy

Shoichi Hirosawa1), Yoshifumi Oguri1) and Tatsuo Sato1)
1) Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology

Formation mechanisms of precipitate free zones (PFZ) in an artificially aged Al–1.74 mol%Cu alloy have been clarified using transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX) and a Monte Carlo computer simulation. The vacancy depletion mechanism caused by the annihilation of quenched-in excess vacancies was found to work predominantly in the early stage of aging at 433 K, whereas the solute depletion mechanism caused by the grain boundary precipitation followed thereafter. The simulation model taking into account such a vacancy depletion effect well reproduced the obtained experimental results, suggesting that the difference of size distribution of Cu clusters after quenching is responsible for the initial formation of PFZ in the subsequent aging stage.


Keyword:
precipitate free zones, aluminum-copper alloy, grain boundary, phase decomposition, Guinier-Preston zones, transmission electron microscopy, computer simulation, Monte Carlo method

Received: January 17, 2005
Accepted: May 02, 2005 , Published online: October 18, 2005
Copyright (c) 2005 The Japan Institute of Metals

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