Paper Title:
Hot Deformation Behaviour and Microstructure in Al-Cu-Li Alloy Containing Small Amount of Ag and Mg
  Abstract

The hot deformation behaviors and microstructure in Al-Cu-Li alloy containing small amount of Ag and Mg were investigated by transmission electron microscopy and isothermal compression tests.When the strain rate is 0.1, 0.01 and 0.001s-1(the deformation temperature within the range of 360-520􀀀 ) and 1 s-1(deformation temperature 520 􀀀 )respectively, the flow stress decreases after a peak value, showing dynamic recrystallization,while the steady-state flow characteristics exist on the other deformation conditions. The flow stress of Al-Cu-Li-Mg-Ag alloy during hot deformation can be expressed by a Zener-Hollomon parameter in the hyperbolic-sine function with the hot deformation activation energyDH of 250.45kJ/mol. The dislocations may climb with support from many vacancies generated during hot deformation, thus forming lots of helical dislocations. The dynamic precipitation and successive dynamic particles coarsening during hot compression have been assumed to be responsible for further flow softening when deformed at low strain rates.

  Info
Periodical
Materials Science Forum (Volumes 519-521)
Edited by
W.J. Poole, M.A. Wells and D.J. Lloyd
Pages
1925-1930
DOI
10.4028/www.scientific.net/MSF.519-521.1925
Citation
Z. G. Chen, Z. Q. Zheng, D. F. Han, "Hot Deformation Behaviour and Microstructure in Al-Cu-Li Alloy Containing Small Amount of Ag and Mg", Materials Science Forum, Vols. 519-521, pp. 1925-1930, 2006
Online since
July 2006
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$32.00
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