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:
The effects of the copper content on the bendability of Al-Mg-Si alloy T4 sheets wereinvestigated. The Al-Mg-Si alloys with less than 0.01mass%Cu, 0.4mass%Cu and 0.8mass%Cu wereprepared, and the time of solution heat treatment was changed to obtain different dispersionconditions of the second phase particles and to obtain different shear band formation conditions bybending. For the samples with less than 0.01mass%Cu and 0.4mass%Cu, no cracks were observedduring the bending. For the sample with 0.8mass%Cu, the maximum depth of the crack by bendingincreased with the time of solution heat treatment up to 75 seconds, and then decreased over 75seconds. The second phase particles decreased by increasing the solution heat treatment time, whilethe formation of shear bands by bending increased by increasing the solution heat treatment time andthe copper content. The cause of the occurrence and the propagation of cracks by bending areconsidered to be the combined effect of the shear band formation across some grains and themicro-voids formed around the second phase particles. Improving of the bendability requires adecrease in the size and number of the second phase particles and/or reduced shear band formationduring the bending
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.519-521.771.pdf
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