Paper Titles
Effect of an Addition of Silver on the Age Hardening and the Formation of a Soft Surface Layer in an Al-12mass%Zn Alloy
p.1883
Influences of Iron Content and Solidification Rate on Mechanical Properties of 6022 Base Aluminium Alloys
p.1889
Effect of Heat Treatment Condition and Alloy Composition on Hydrogen Content in Al-Mg Alloys
p.1895
Work Hardening Behaviour of Heat-Treatable Al-Mg-Si-Alloys
p.1901
Research of Super Lattice Structure Parameters in Alloys of Al-Li-Mg System
p.1907
Delineating the Role of Second Phase Particles in AA6111
p.1913
Production of AA6082 Feedstock for Forming in the Semi-Solid State
p.1919
Hot Deformation Behaviour and Microstructure in Al-Cu-Li Alloy Containing Small Amount of Ag and Mg
p.1925
Trace Element Effects on Microstructure and Mechanical Properties in Al-Cu-Li Alloy after Thermal Exposure
p.1931

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

Article Preview

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.

You might also be interested in these eBooks
Aluminium Alloys 2006 - ICAA10 View Preview

Info:

Periodical:

Materials Science Forum (Volumes 519-521)

Pages:

1925-1930

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.519-521.1925

Citation:

Cite this paper

Online since:

July 2006

Authors:

Zhi Guo Chen, Zi Qiao Zheng, Dong Feng Han

Keywords:

Al-Li, Deformation, Dynamic Recovery, Dynamic Recrystallization (DRX), Microstructure

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2006 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

References

[1] E.J. Lavernia, T.S. Srivatsan, F.A. Mohamed:J. Mater. Sci. Vol. 25(1990), p.1137.

Google Scholar

[2] T. Sheppard and A. Jackson: Mater. Sci. & Tech. Vol. 13(1997), p.203.

Google Scholar

[2] H. Shi A.J. mclaren,C.M. Sellars el al: Mater. Sci. & Tech. Vol. 13(1997), p.210.

Google Scholar

[4] Z. Chen,Z. Zheng:J. Wuhan University of Tech. -Mater. Sci. Ed. Vol. 20(2005), p.9.

Google Scholar

[5] J.J. Jonas, C.M. Sellars: Int. Metall. Rev. Vol. 14(1969), p.1.

Google Scholar

[6] J.J. Jonas H.J. McQueen and W.A. Wong: Deformation under hot working conditions (Iron and Steel Institute, London 1968).

Google Scholar

[7] J. Shen: Trans. Nonferrous Met. Soc. China Vol. 8(1998), p.78.

Google Scholar

[8] J.P. Poirier: High Temperature Plastic Deformation of Crystals(Dalian University of Sci. & Tech. Press, Dalian 1989).

Google Scholar