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Sintering of icosahedral quasicrystalline Al-Cu-Fe powders using high quasihydrostatic pressure
|Mykola O. Yefimov , Yuly V. Milman , Dina V. Lotsko , Sergey V. Ulshin , Izabella I. Timofeeva , Miroslav V. Karpets , Olexander I. Bykov
Institute for Problems of Materials Science, 3, Krzhizhanovsky, Kyiv 03142, Ukraine
The processes accompanying the sintering of quasicrystalline Al-Cu-Fe powders were investigated. Pure Al-Cu-Fe powders and powders alloyed by 0.3 wt.% Sc and 11 wt.% Cr were chosen for studies. Quasicrystalline powders were produced by water atomization technique. The technology of sintering with high quasihydrostatic pressure was used. High-temperature sintering under high quasihydrostatic pressure was realized in the high-pressure cell of “lentil” type. Sintering was carried out at 700 С during 2 min using the pressure range from 2.8 up to 7 GPa. The optimum pressure of preliminary cold pressing (0.6 GPа) and high temperature pressing (3-4 GPа) were determined. The compacts with porosity < 2% were obtained. The phase compositions of compacts were studied by X-ray diffractometry and SEM techniques. Microhardness was measured by Vickers indenter at a load of 2 N. Using the original technique developed by authors the plasticity characteristic δH of the sintered quasicrystalline compacts was determined from the microhardness values as well.
Presentation: poster at E-MRS Fall Meeting 2005, Symposium I, by Mykola O. Yefimov
See On-line Journal of E-MRS Fall Meeting 2005
Submitted: 2005-05-04 14:53 Revised: 2009-06-07 00:44