ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Ultrafine grained (UFG) 5083 Al and 5154 Al alloys were prepared by equal channelangular pressing (ECAP) with an effective strain of ~ 4 or ~ 8. This investigation was aimed atexamining the effect of the ECAP strain and post-rolling inducing different microstructure in thesealloys on the deformation mechanisms at low temperature superplastic (LTS) and high strainsuperplastic (HSRS) regimes. The sample after 4 passes (a strain of ∼ 4) did not exhibit LTS, butsuperplastic elongations were obtained in the sample after 8 passes (a strain of ∼ 8). An analysis ofthe mechanical data in light of the standard deformation mechanisms revealed that deformation ofthe sample after 4 passes was governed by dislocation climb while grain boundary sliding attributedto LTS of the sample after 8 passes. In addition, the 5154 Al alloy processed by ECAP and postrollingwas capable of enhancing HSRS elongation significantly. An analysis revealed that thedeformation mode was changed from dislocation viscous glide to grain boundary sliding byadditional ECAP strain and post-rolling
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.597.pdf
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