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 superplastic deformation characteristics of the AZ91, the mostly used magnesiumalloy, were investigated at various strain rates in the interval from 3x10-5 to 1x10-2 s-1 andtemperature of 420 °C. To prepare superplastic alloys thermo-mechanical treatment was used. Castmaterials were heat-treated in two stages, after homogenization at 415 °C for 10 h were submitted tothe precipitation annealing at temperature in the range of 200-380 °C for 10 h, and deformed by hotextrusion. Microstructure of samples was observed by the light microscope Olympus. Strain ratesensitivity parameter m has been estimated by the abrupt strain rate changes method. The strongstrain rate dependence of the m-parameter was found. The highest elongation to failure, 584%, wasfound for the samples aged at 380 °C. Possible physical mechanisms of the superplastic flow arediscussed
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.567-568.365.pdf
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