Abstract
Abstract The deformation behavior of single crystals of MoSi 2 –WSi 2 solid-solutions with the C11 b structure has been investigated as a function of alloy composition in the temperature range from room temperature to 1500°C in compression, paying special attention to the contribution of stacking faults on (001) whose density increases with the increase in WSi 2 additions. The strength of MoSi 2 increases with the increase in WSi 2 additions, in particular, at high temperatures but the onset temperature for plastic flow decreases rather rapidly with the increase in the amount of WSi 2 additions. The improvement of fracture toughness of MoSi 2 is found to be difficult to be achieved simply by forming solid-solutions with WSi 2 because of the rather rapid decrease in the deformability and the gradual increase in the density of (001) stacking faults with the increase in WSi 2 additions.
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