Abstract
In order to analyze the strengthen behaviors of the Y element, the microstructures and mechanical properties of Mg-10Gd-0.2Zn-xY-0.4Zr (x = 0, 1 wt%) two alloys were investigated. Based on the experimental results, Y addition could largely refine the size of β′ precipitate and increase its number density. This phenomenon has been analyzed by theoretical studies in this paper. Due to the fine and dense β′ precipitates, the mechanical properties of the Y-containing alloy was highly improved. In addition, β1 precipitate also has important contribution to the mechanical property. Based on the TEM observation, after tensile test, the β′ precipitates were obviously sheared by the 112¯0α slip dislocations in Y-containing and Y-free alloy, then, it illustrates that the strengthen effect in both two alloys was mainly derived from the shearable mechanism.
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