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Effect of the LPSO volume fraction on the microstructure and mechanical properties of Mg–Y2X–ZnX alloys

AuthorsOñorbe, Elvira; Garcés, Gerardo; Pérez Zubiaur, Pablo; Adeva, Paloma
KeywordsLPSO volume fraction
Mg–Y2X–ZnX alloys
Mechanical properties
Issue Date2012
CitationJournal of materials science 47( 2) : 1085-1093 (2012)
AbstractThe influence of the volume fraction of longperiod stacking ordered structure (LPSO) on the microstructure and mechanical properties in three extruded Mg100-3xY2xZnx alloys (x = 0.5, 1 and 1.5 at.%) has been studied. Two structures of LPSO phase coexist in these extruded alloys, 18R and 14H. The 18R structure transforms to 14H structure gradually in the course of the extrusion process. For the three alloys, the grain size in the vicinity of LPSO phase particles is refined because of a particle-stimulated nucleation (PSN) mechanism. The reinforcing effect of the LPSO phase is active up to 523 K. Above this temperature, grain size effect becomes important. Accordingly, MgY1Zn0,5 extruded alloy shows the Highest mechanical strength for temperatures greater than 523 K.
Publisher version (URL)http://dx.doi.org/10.1007/s10853-011-5899-4
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