Kazuo Isonishi1 and Masaharu Tokizane2
1Graduate Student, Ritsumeikan University, Kyoto
Vacuum hot pressing of Fe-10%Si-6%Al alloy (Sendust) powder prepared by Ar-gas atomizing was carried out at temperatures between 1123 and 1273 K and at pressures between 100 and 200 MPa for various periods of time up to 7.2 ks.
Under the pressure of 100 MPa, the compacts having high relative density (>99%) were obtained at a temperature higher than 1223 K. At a lower temperature such as 1173 K, a higher pressure (200 MPa) was necessary to obtain the compacts having a high relative density (>99%).
The high temperature deformation behaviors of the compacts were also investigated by compression tests at various temperatures corresponding to the hot pressing temperatures using the compacts having the density higher than 99%. The results indicated that, in this alloy, the high temperature deformation behaviors changed at the temperature (~eq 1173 K) where the DO3\rightleftarrows α order-disorder transformation occurred. Remarkable differences in the deformation behavior were recognized between lower and higher temperatures than this temperture. These facts were presumed to be a cause of the observed difference between densification behaviors of the compact at the lower temperatures (1123 K and 1173 K) and the higher temperatures (1223 K and 1273 K) during hot pressing.
hot pressing, argon-gas atomized, Sendust powder, high density compact, high temperature deformation, order-disorder transformation
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