Abstract
Microstructures and mechanical properties of V(Vanadium)-containing MO2NiB2 hard alloys were studied for Ni-6 mass%B-58.6 mass%Mo-(0-12.5) mass%V alloys.Boride (M3B2, M:Mo, Ni, V) particle size decreased with increasing V content larger than 5μm for the 0 mass%V alloy and about lμm for the 12.5 mass%V alloy. The crystal structual change of the boride from orthorhombic to tetragonal was responsible for the particle size reduction. The highest transverse-rupture strength (TRS) of 2.5 GPa was obtained for the 12.5 mass%V alloy which exhibited the smallest particle size. The 12.5 mass%V alloy showed small decrease in hardness at high temperatures at 1073 K.
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