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


Article Preview

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.



Materials Science Forum (Volumes 519-521)

Edited by:

W.J. Poole, M.A. Wells and D.J. Lloyd






Z. G. Chen et al., "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




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

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

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

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

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

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

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

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

In order to see related information, you need to Login.