Mechanical alloying of Ti-47Al-3Cr(at%) and TiH2-47Al-3Cr (at%) using a Zoz attritor


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.59-69 identifier

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Cilt numarası:
  • Basıldığı Şehir: Ohio
  • Basıldığı Ülke: Amerika Birleşik Devletleri
  • Sayfa Sayıları: ss.59-69

Özet

Not only morphological evolution of powder mixture particles during horizontal rotary ball milling of elemental ductile-prealloyed ductile (a mixture of acicular Ti + high pressure Ar atomised prealloyed 47Al-3Cr powder mixture) and brittle intermetallic prealloyed ducti le (a mixture of acicular TiH2 + Ar atomised prealloyed 47Al-3Cr spheroidal powder mixture) ternary component materials systems with a Zoz attritor were investigated but also the possibility of obtaining particles of above ternary systems with an average 10 mu m particle size with low contamination rate and short MA times by especially paying attention to the ductility of component powders. For this purpose, crystal structure change during MA was studied by XRD and confirmed by SEM work. It was found that, in 6 hours of MA time with Zoz attritor, 25-30 mu m powder is yielded with no contamination in Ti+Al-Cr ducti le-ductile system while it was 10-15 mu m for brittle-ductile (TiH2+Al-Cr) ternary component materials system due to the existance of the TiH2 brittle component in the as mixed powder. The morphological evolution in this system during Zoz attrition was also observed somewhat different from the ductile-ductile one. In Ti+Al-Cr and TiH2+Al Cr systems during MA of up to 6 hours under Ar with a Zoz attritor alloying took place as confirmed by XRD work resulting in Ti(Al) and TiH2(Al) solid solution formations, respectively, with some free Al and Cr still present in the structure.