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:
One of the most challenging activities for magnesium industry is to increase productivityby introducing cost-effective processes. While die-cast magnesium alloys are in worldwide use,even in the demanding sector of automotive industry, where cost is the major asset, wroughtmagnesium alloys still not widely available. The aim of the present study was to evaluate the hightemperature response by torsion testing of a ZM21 alloy, to calculate the constitutive equations tobe used in FEM simulation of the extrusion process. The ZM21 alloy that was considered in thepresent study was Direct-Chill casted by Alubin Ltd., Israel. Torsion tests were carried out in air ona computer-controlled torsion machine, under strain rates ranging from 10-2 to 5 s-1 andtemperatures from 200 to 400°C. The equivalent peak flow stress was related to temperature andstrain rate by means of the conventional power-law and by the sinh equation. The microstructure ofthe alloy, even at 300°C, appeared largely unrecrystallized, with elongated grains; also at 400°C,the structure is more equiaxed, but elongated structures still appears
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.367.79.pdf
