Abstract
In this study the microstructure evolution and the mechanical properties of different cast Mo-XZr (X = 5, 10, 15, 20 at.%) alloys were investigated. It focuses on the effect of Zr concentrations on the second phase formation in binary Mo-Zr alloys. All alloys exhibit polycrystalline Mo2Zr precipitations as well as a (Mo, Zr) solid solution phase, which in most cases forms the matrix phase. Microhardness measurements were carried out by the Vickers indentation method. The Mo2Zr precipitations show a strengthening effect in addition to the solid solution hardening. Additionally, constant displacement tests in the compressive mode at room temperature confirm these findings. However, the homogeneously distributed Mo2Zr phases offer an extraordinary potential to improve the strength of Mo-based alloys without decreasing the ductility.
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