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Medientyp:
E-Artikel
Titel:
Examination of breakdown stress in creep by viscous glide in Al–5·5 at.-%Mg solid solution alloy at high stress levels
Beteiligte:
Graiss, G.;
El-Rehim, A. F. Abd
Erschienen:
SAGE Publications, 2007
Erschienen in:Materials Science and Technology
Sprache:
Englisch
DOI:
10.1179/174328407x226545
ISSN:
1743-2847;
0267-0836
Entstehung:
Anmerkungen:
Beschreibung:
<jats:p> Creep tests on Al–5·5 at.-%Mg solid solution alloy show that the stress exponent n increases with increasing stress from 3·1 to 5·5. It is demonstrated that the transition to n≈5·5 is not consistent either with normal power law breakdown or with a transition to a region of viscous glide controlled by pipe diffusion, but the results are in good agreement with a breakdown of the dislocations from their solute atmospheres. The activation energies for creep at low and high stresses are 136 and 170 kJ mol<jats:sup>−1</jats:sup> respectively. </jats:p>