Original scientific paper

Superplastic Deformation of Al-Al₄C₃ Composites

M. Besterci
O. Velgosová
F. Lofaj
L. Kováč

Abstract

Deformation of the Al-Al₄C₃ composites with different volume fraction of Al-Al₄C₃ phase was investigated at different temperatures (293 - 723 K) and different strain rates (2,5 * 10-5 s-1 do 1,0 * 10-1 s-1). At temperatures 673 - 723 K and at the highest strain rate of 1,0 * 10-1 s-1, a significant ductility increase was observed. TEM analysis suggests the onset of superplasticity may be the result of dynamic grain polygonization, grain slip and rotation, partial recrystallization and dislocation creep in the tested system, which is known as strain induced dynamic recovery. Increase of the volume fraction of secondary phase in the studied composite resulted in a shift from slip on grain boundaries controlled mechanism to the grain rotation controlled deformation mechanism.

Keywords

composite material; deformation; strain rate; TEM; superplasticity

Hrčak ID:

127820

URI

https://hrcak.srce.hr/127820

Publication date:

1.10.2005.

Article data in other languages: croatian

Visits: 1.653 *