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:
We have systemically studied the effect of the erbium on the microstructure and themechanical properties in the 5xxx series aluminum alloys by using optical microscope, transmissionelectron microscope (TEM) and by tensile testing. The results demonstrate that the tensile strengthincreased quickly at the beginning of small contents of 0.1%Er both in the hot and cold rolled states,then slowly increased with increasing the contents of Er until 0.4%, at which the best balance of thestrength and ductility (438MPa and 9.6%) were obtained. Microstructure observation in the hot rolledstate was indicated that the grain structure in the Er free Al-5Mg alloy revealed fully recrystallizedgrain structure, while in the Al-5Mg containing Er was demonstrated deformation structure,indicating the Er addition delayed the recrystallization behavior by the formation of the precipitationof the Al3Er, which confirmed by means of the X-ray diffraction analysis. Furthermore in the TEMmicrostructure observation the precipitation of Al3Er was distributed both in the grain interior andsubgrain or grain boundaries, which could be pinning the subgrain or grain boundary migration anddislocation movement as well. Consequently the beginning of the recrystallization temperature in theAl-5Mg containing Er was elevated about 50ºC than in Al-5Mg without Er. This could be explainedthat the strength increased without the deterioration of the ductility was attributed to themicrostructure refinement by the Er addition
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.623.pdf
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