Transactions of Nonferrous Metals Society of China
JOURNAL OF RAILWAY SCIENCE AND ENGINEERING
|Vol. 12 No. 4 August 2002|
（1.Chalmers University of Technology, SE-41296 Gothenburg, Sweden；
2.Central Iron and Steel Research Institute, Beijing 100081, China）
Abstract:The indentation toughness of Mo5Si3-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 Mo5Si3 increases with the alloying additions, from 2.4MPa·m1/2 for monolithic to just over 3MPa·m1/2 for highly alloyed Mo5Si3. Small volume fractions of brittle secondary phases may have a positive impact on the indentation toughness; while larger fractions seems to lower the toughness.
Key words: indentation toughness; Mo5Si3; alloying