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:
Friction stir processing (FSP) is the effective method of the grain refinement for lightmetals. The aim of this study is to acquire the fine grained bulk Mg-Y-Zn alloy by ingot metallurgyroute much lower in cost. Such bulk alloy can be formed by the superplastic forging. Themicrostructure of as-cast Mg-Y-Zn alloy was dendrite. The dendrite arm spacing was 72.5 [(m],and there are the lamellar structures in it. FSP was conducted on allover the plate of Mg-Y-Zn alloyfor both surfaces by the rotational tool with FSW machine. The stirring passes were shifted half ofthe probe diameter every execution. The dendrite structures disappeared after FSP, but the lamellarstructure could be observed by TEM. The matrix became recrystallized fine grain, and interdendriticsecond phase particles were dispersed in the grain boundaries. By using FSP, cast Mg-Y-Zn alloycould have fine-grained. This result compared to this material produced by equal channel angularextrusion (ECAE) or rapid-solidified powder metallurgy (RS P/M). As the result, as-FSPed materialhas the higher hardness than materials produced by the other processes at the similar grain size
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.558-559.777.pdf
