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Digitale Medien

Strain Rate Sensitivity of Ultrafine Grained Aluminium Alloy AA6061 (2008)

Vevecka-Priftaj, Aferdita ; Böhner, Andreas ; May, Johannes ; [weitere]

s.l. ; Stafa-Zurich, Switzerland

Materials science forum Vol. 584-586 (June 2008), p. 741-747

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ISSN: 1662-9752

Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008

Thema: Maschinenbau

Notizen: The strain rate sensitivity of the aluminium alloy AA6061 has been investigated in aconventional grain sized (CG) state and in two different ultrafine grained (UFG) conditionsprocessed by Equal Channel Angular Pressing (ECAP) for 2 and 6 passes at 100o C. Strain ratejump tests in compression were performed at different temperatures and the strain-rate sensitivityexponent m was determined. The tests were accomplished by microstructural investigations beforeand after compression testing in CG and UFG conditions. It is shown that all UFG microstructuresexhibit strongly increased strain-rate sensitivity (SRS) compared to the CG state. The SRS increaseswith increasing temperature and is more pronounced for the UFG material processed using 6 ECAPpasses. The microstructural investigations show a rather high stability of the grain structure for theUFG conditions up to 250o C. The results are discussed with respect to the relevant deformationmechanisms

Materialart: Digitale Medien

URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.584-586.741.pdf

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