Journal
INTERNATIONAL JOURNAL OF MATERIALS RESEARCH
Volume 99, Issue 3, Pages 273-280Publisher
CARL HANSER VERLAG
DOI: 10.3139/146.101633
Keywords
ECAP; ECAE; Al-Mg-Cu; precipitation hardening
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The interaction of equal channel angular extrusion (ECAE) with precipitation hardening during warm ECAE at 180 degrees C in a Al-4.3 wt.% Mg-1.2 wt.% Cu alloy, annealed at various stages of ageing, was studied by room temperature compression tests and transmission electron microscopy. It was observed that peak aged samples lose much of their strength during ECAE due to fragmentation of precipitates. The highest strength after four ECAE passes (route Bc) at 180 degrees C is obtained with samples in the under-aged condition although in this case dissolution of precipitates into the matrix occurs. After four ECAE passes fine equiaxed grains with an average size of approximately 200 nm with some traces of remnant elongated grains were obtained.
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