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- W2972753258 abstract "Molybdenum disilicide (MoSi$_2$) is a very promising material for high temperature structural applications due to its high melting point (2030 °C), low density, high thermal conductivity and good oxidation resistance. However, MoSi$_2$ has limited ductility below 900 °C due to its anisotropic plastic deformation behaviour and high critical resolved shear stresses on particular slip systems. Nanoindentation of MoSi$_2$ microalloyed with aluminium, niobium or tantalum showed that all alloying elements cause a decrease in hardness. Analysis of surface slip lines indicated the activation of the additional {1 1 0} slip system in microalloyed MoSi$_2$, which is not active below 300 °C in pure MoSi$_2$. This was confirmed by TEM dislocation analysis of the indentation plastic zone. Further micropillar compression experiments comparing pure MoSi$_2$ and the Ta-alloyed sample enabled the determination of the critical resolved shear stresses of individual slip systems even in the most brittle [0 0 1] crystal direction." @default.
- W2972753258 created "2019-09-19" @default.
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- W2972753258 date "2019-09-10" @default.
- W2972753258 modified "2023-09-27" @default.
- W2972753258 title "Low temperature deformation of MoSi$_2$ and the effect of Ta, Nb and Al as alloying elements" @default.
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