Abstract
The microstructure and high-temperature shear strength of the Mg–10Gd–3Y–1.2Zn–0.5Zr alloy were investigated in the as-cast and aged (T6) conditions. The shear yield stress (SYS), and ultimate shear strength (USS) were measured by the shear punch test (SPT) in the temperature range of 25–300°C. The results showed that both USS and SYS of the as-cast alloy are greatly improved after the T6 aging treatment at all test temperatures. However, the variation of strength with temperature showed different trends for the as-cast and aged conditions of the material. The USS of the aged alloy decreased monotonically from 315MPa at room temperature, to 282MPa at 300°C. This was in contrast to the USS values of the as-cast alloy, which first decreased from 270MPa at room temperature to 255MPa at 150°C, and then increased with temperature, passing through maximum values of 263MPa at 250°C. The mechanism by which the as-cast and aged alloys show different shear behavior with increasing test temperature was discussed and related to the role of precipitates and the long period stacking ordered (LPSOs) in high temperature strengthening.
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