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:
Magnesium applications for structural components in the automotive industry areconstantly rising. This is based on the recent development of new alloys, new fabrication processes,and the ambition of car manufacturers to reduce the vehicles weight and CO2 emissions accordingto the EU and US policy [1, 2]. A rising quantity of magnesium per vehicle leads to a risingquantity of scrap which needs to be recycled according to the European Directive on end-of lifevehicles [3]. So far post consumer scrap has not been used for structural parts. But since the metal isstill expensive compared to aluminium or steel, and remelting saves more than 90 % of the energyfor primary production, magnesium recycling will significantly contribute to cost savings.In comparison to steel or aluminium a recycling cycle for magnesium has not yet been established.Concerning post consumer scrap it is likely that many vehicles will end up in the shredder fractionor at least will be mixed up instead of being dismantled and separated according to their alloy. Thusit is reasonable to define secondary alloys which allow the use of post consumer scrap for structuralapplications. Creep resistant alloys have the potential of a broad application concerning the weightof the components and therefore a secondary alloy would be reasonable. The aim of this work is toexamine a row of AM50-based alloys, modified with additions of Sr, Ca, and Si due to theimportance of these elements to increase creep resistance and their usage in modern magnesiumalloys. The corrosion properties as well as the mechanical properties and microstructures areinvestigated in the as-cast and annealed condition. Salt spray tests (using 5 % NaCl) andelectrochemical corrosion methods are applied to investigate the corrosion properties which arethen compared to the unmodified AM50. Tensile and compression tests at temperatures rangingfrom 20 °C to 200 °C are applied to investigate the mechanical properties
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.108.pdf
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