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The indentation toughness of Mo 5Si 3 based phases was studied with regard to different alloying elements, amount of alloying addition as well as the presence of secondary phases. Cr, Ti, Nb, Ni and Co were added as alloying elements. The results show that the indentation fracture toughness of Mo 5Si 3 increases with the alloying additions, from 2.4?MPa·m 1/2 for monolithic to just over 3?MPa·m 1/2 for highly alloyed Mo 5Si 3. Small volume fractions of brittle secondary phases may have a positive impact on the indentation toughness; while larger fractions seems to lower the toughness.
The indentation toughness of Mo 5Si 3 based phases was studied with regard to different alloying elements, amount of alloying addition as well as the presence of secondary phases. Cr, Ti, Nb, Ni and Co were added as alloying elements. The results show that the indentation fracture toughness of Mo 5Si 3 increases with the alloying additions from 2.4 · MPa · m 1/2 for monolithic to just over 3 · MPa · m 1/2 for highly alloyed Mo 5Si 3. Small volume fractions of brittle secondary phases may have a positive impact on the indentation toughness; while larger fractions seems to lower the toughness.