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A Study of the Kinetic of Precipitation and the Morphology of Precipitates Induced by Plastic Deformation in Al-Zn Alloys

Published online by Cambridge University Press:  21 February 2011

C. Mai ,
P. Merle ,
J. Merlin  and
F. Livet
C. Mai
Affiliation:
Gemppm (LA.341), I.N.S.A. - BAT, 502 – 69621 - Villeurbanne - France
P. Merle
Affiliation:
Gemppm (LA.341), I.N.S.A. - BAT, 502 – 69621 - Villeurbanne - France
J. Merlin
Affiliation:
Gemppm (LA.341), I.N.S.A. - BAT, 502 – 69621 - Villeurbanne - France
F. Livet
Affiliation:
LTPCM (LA.29) E.N.S.E.E.G. - BP 44 - St Martin D'Here - France
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Abstract

The influence of plastic deformation on the kinetic of precipitation and the morphology of precipitates in an Al-Zn 4.4 % at. studied by T.E.P. and SAXS is reported. Some results can be pointed out ; after a given amount plastic deformation at room temperature by tensile strength:

i - the precipitates have a flat shape (instead of the spherical or ellipsoidal shape usualy observed in this alloys.

ii - the precipitate volume fraction is a function of strain (ε) and strain rate (ė). For a given ė, the higher precipitate volume fraction is obtained with the higher ε. For a given ε, the lower ė the higher the volume fraction of precipitates.

iii - the scattering intensities at small angle for three orientations of the sample (α =0,45°, 90° where α is the angle between the axis of tensile and the scattering vector- are different. A calculation for an anisotropic orientation of flat discs shows that precipitates have a preferential texture. The orientation is about 50° from the tensile axis.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 21: Symposium GREECE – Phase Transformations in Solids , 1983 , 519
Copyright
Copyright © Materials Research Society 1984

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References

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