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Instability of plastic deformation in model Al-Li based alloys subjected to tension.

Jaźwińska A., Mizera J., Wyrzykowski J.W.

Inżynieria Materiałowa

1998

R. XIX, nr 3

604-607

The paper analyses the instability of plastic deformation in Al-Li-Cu-Zr that occurs during an uniaxial tensile test. The instability is manifested in the form of serrations which appear on the stress-strain curve (sigma-epsilon). The analysis of plastic instability in this alloy was concerned with the relation between this instability and the initial deformation degree (sheets after rolling) and sheet anisotropy. The plastic instability was described quantitatively using mathematical tools. A quantitative analysis of the serration has shown that, in the precipitation hardened alloy, as the deformation degree increases the intensity of the serrations observed on the stress-strain curve and the individual sample cutting directions (with respect to the axes of the sheet anisotropy) increases. In the alloy subjected to saturation, no essential differences in the character of the stress-strain curve serrations were observed.