Titanium-titanium nitride MMC's by reactive mechanical alloying

Ozbilen S., Cetinkaya C.

International Symposium on Powder Materials - Current Research and Industrial Practices at the 1999 TMS Fall Meeting, Ohio, Amerika Birleşik Devletleri, 31 Ekim - 04 Kasım 1999, ss.187-195 identifier

  • Cilt numarası:
  • Basıldığı Şehir: Ohio
  • Basıldığı Ülke: Amerika Birleşik Devletleri
  • Sayfa Sayıları: ss.187-195


Reactive mechanical alloying (RMA) of TiH2 (sample #1), 50 wt%Ti-50 wtPb TiH2 (sample #2) powder mix and mechanical alloying (MA) of Ti (sample #3) powder mix for 10 uninterrupted hours with sealed vial was carried out under nitrogen. This was followed by annealing of MA'ed powders under N-2 atmosphere to 950 degrees C for thermal treatment to determine if nitrides are forming. Representative samples of each powder mix subjected to reactive mechanical alloying and thermal treatment were characterised by XRD using Cu K alpha radiation and examined by Cambridge ST40 Stereoscan SEM operating under 25kV to determine morphology and crystal structure change of the powders. It is observed that RMA under N-2 cause to the formation of TiN in all the samples studied. Annealing under N-2 atmosphereto 950 degrees C for I hour leads to the formation of Ti-TiN-Ti2N multi-phase material in samples #1 and #2 (with different rations); to that of Ti-TiN composite material in sample #3. This shows that sintering of the MA'ed powders of TiH2, Ti-TiH2 and Ti is a promising way for producing ultrafine grained titanium-titanium nitride composite materials with RMA processing under N-2 atmosphere.