摘要
Titanium silicide Ti 5Si 3 whose melting temperature is 2 130 ℃ bears the potential for very high temperature application. Results on Nb or Cr addition to this compound with emphasis on its alloying behaviour were reported. Previous theoretical calculation shows that substitution of Ti by Nb or Cr atoms in Ti 5Si 3 crystal will enhance the bonding between atoms. By experiment, two means of alloying were considered: stoichiometric and off stoichiometric alloying. Stoichiometric alloying in Ti 5Si 3 results in compounds consisting of single Ti 5Si 3 phase while off stoichiometric alloying yields hypereutectic microstructure with Ti 5Si 3 being the primary phase. The Ti 5Si 3 phase in both cases dissolves certain amount of Nb or Cr alloying element and its composition agrees with the stoichiometric composition of (Ti,Nb) 5Si 3 or (Ti,Cr) 5Si 3. The moduli of the stoichiometric alloys increase with alloying element addition, indicating an enhancement in Ti 5Si 3 crystal.
Titanium silicide Ti 5Si 3 whose melting temperature is 2 130 ℃ bears the potential for very high temperature application. Results on Nb or Cr addition to this compound with emphasis on its alloying behaviour were reported. Previous theoretical calculation shows that substitution of Ti by Nb or Cr atoms in Ti 5Si 3 crystal will enhance the bonding between atoms. By experiment, two means of alloying were considered: stoichiometric and off stoichiometric alloying. Stoichiometric alloying in Ti 5Si 3 results in compounds consisting of single Ti 5Si 3 phase while off stoichiometric alloying yields hypereutectic microstructure with Ti 5Si 3 being the primary phase. The Ti 5Si 3 phase in both cases dissolves certain amount of Nb or Cr alloying element and its composition agrees with the stoichiometric composition of (Ti,Nb) 5Si 3 or (Ti,Cr) 5Si 3. The moduli of the stoichiometric alloys increase with alloying element addition, indicating an enhancement in Ti 5Si 3 crystal.
出处
《中国有色金属学会会刊：英文版》
CSCD
1999年第S1期340-345,共6页
Transactions of Nonferrous Metals Society of China
