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 microstructural and mechanical characterization of two alloys within the Mg-Ni-YREsystem prepared by casting and subsequent hot extrusion at 400ºC have been carried out. Themicrostructure of both materials consists of a fine-grained magnesium matrix embedding a highvolume fraction of second phases; coarse Mg12RE and long period ordered stacking structure (LPSphase) and fine Mg2Ni particles. Both alloys show high strength values up to 250ºC. The yield stressvalues at room temperature are 295 and 405 MPa for low- and high-alloyed magnesium alloy,respectively. Load transfer from the magnesium matrix to coarse Mg12RE and LPS particles accountfor the high strength of both alloys at temperatures below 250ºC. Above this temperature both alloysexhibit a superplastic behaviour at low stresses with elongations of 700 and 450 % for the low andhigh-alloyed magnesium alloy, respectively
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.567-568.385.pdf
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