ISSN:
1662-9752
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:
Equal-channel angular pressing (ECAP) at 443 K was used to introduce an ultra-finegrained (UFG) microstructure to a Zr and Sc modified 7075 aluminum alloy. Using the methods ofTEM and EBSD, an average grain size of 0.6 1m was recorded after the pressing. The UFGmicrostructure remained very stable up to the temperature of 723 K, where the material exhibitedhigh strain rate superplasticity (HSRSP) with elongations to failure of 610 % and 410 % at initialstrain rates of 6.4 x 10-2 s-1 and 1 x 10-1 s-1, respectively. A strain rate sensitivity parameter m in thevicinity of 0.45 was observed at temperatures as high as 773 K. At this temperature, the material stillreached an elongation to failure of 430 % at 2 x 10-2 s-1. These results confirm the stabilizing effectof the Zr and Sc additions on the UFG microstructure in a 7XXX series aluminum alloy producedby severe plastic deformation
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.584-586.164.pdf
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