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:
Aluminum alloys with high Mg2Si-content (〉10 %) offer the possibility of a significant decreasein density and an increase in stiffness at the same time. But these alloys can hardly be produced incasting processes, due to an oxidation and a generation of pores by hydrogen solubility of the melt.Furthermore, the usual solidification rate is not sufficient for a fine microstructure morphology. Afine distribution of Mg2Si is possible by spray forming, where a coarsening of the particles can beavoided due to a higher solidification rate. Different aluminum alloys with high Mg2Si-content(〉10 %) have successfully been produced by spray forming, extrusion and age hardening.Mg-excess as well as Si-excess has been investigated. An additional alloying with copper leads to afurther increase in strength by the precipitation sequence of Al2Cu. The new light-weight aluminumalloys have been investigated regarding age hardening, physical and mechanical properties.Densities of 2.5-2.6 g/cm3 and Young´s modulus of approx. 80,000 MPa have been found.Microstructures were dense, homogeneous and of fine morphology. The yield strength of thesealloys reached values of approx. 400 MPa after artificial aging, whereby only a slight decrease forthe hot yield strength was observed up to a temperature of 200 °C. Applications of the newlight-weight aluminum alloys can be expected where a reduced density together with a high hotyield strength would lead to a more compact design in high temperature environments, e.g. incombustion engines
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.519-521.1245.pdf
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