ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
Magnesium alloys are increasingly used in automotive, aeronautic and electronicapplications to produce high performance, light weight parts. In the thixomolding process the semisolidslurry is injected into a mold at controlled temperature such that the melt has specific flowbehavior. This allows the fabrication of near net shape components with controlled microstructureand good mechanical properties. The numerical modeling of such applications presents unusualchallenges for both the physical modeling and the solution algorithm. This paper presents 3Dsolutions of the injection molding of semi-solid AZ91 magnesium alloys. The methodology dealswith the shear thinning, temperature dependent viscosity behavior and is able to accurately solve thehigh velocity flows encountered during semi-solid magnesium molding. The approach is applied tothe injection of a tensile bar and the results compared with experimental data. The numericalsolutions indicate that the material forms a jet at the exit of the gate and a swirling flow forms as thematerial advances along the first larger diameter section. The wall regions are filled first, leaving avoid inside. This agrees very well with the experimental observation
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.231.pdf
