Article ID Journal Published Year Pages File Type
1576497 Materials Science and Engineering: A 2013 8 Pages PDF
Abstract
The effect of grain size and alloying elements on the yield strength in compression was investigated using pure magnesium and its diluted solid solution alloys (Mg-Zn and Mg-Y alloys). The yield strength in compression was closely related to the {10-12} twinning, and followed the Hall-Petch relation in all the alloys. The value of σ0 increased in the following order, Mg-Y>Mg-Zn>pure magnesium, indicating solid solution strengthening; however, the slope in the Hall-Petch relation was not influenced much by the alloying elements. The twinning formed frequently at the grain boundaries with a low misorientation angle, and even occurred in the parent grains with a low Schmid factor in all the alloys. These results indicated that one of the most influential parameters for the Hall-Petch slope was not the Schmid factor but the grain boundary characteristics. All the stress and strain curves in the compression showed a plateau region referring to the expansion/propagation of {10-12} twinning after the yielding behavior. The length of the plateau region increased with a decrease in the grain size and the Schmid factor of the basal slip in the parent grains.
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Physical Sciences and Engineering Materials Science Materials Science (General)
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