日本金属学会誌

J. Japan Inst. Metals, Vol. 67, No. 4 (2003),
pp. 177-180

Preparation and Characterization of Nanocrystalline Ti-2 at%Fe-10 at%Si Alloy by Mechanical Alloying and Pulsed Current Sintering Process

Keizo Kobayashi, Akihiro Matsumoto, Toshiyuki Nishio and Kimihiro Ozaki

Institute for Structural and Engineering Materials, National Institute of Advanced Industrial Science and Technology, Nagoya 463-8560

Abstract:

Ti-2 at%Fe-10 at%Si amorphous powder was synthesized by mechanical alloying (MA) of pure Ti, Fe and Si powders using a planetary ball milling for 1440 ks. The crystallization temperature of the obtained amorphous powder was about 830 K.

Ti-2 at%Fe-10 at%Si amorphous powder was consolidated using a pulsed current sintering (PCS) process at a die temperature of 773 K under a pressure of 372 MPa. The compact was densified at the die temperature between 743 K and 763 K with the crystallization of amorphous phase. The obtained Ti-2 at%Fe-10 at%Si alloy consists mainly of nanocrystalline α-Ti phase. The compressive strength of the nanocrystalline compact at a room temperature was more than 1.7 GPa, which was much higher than that of the commercial Ti-6 mass%Al-4 mass%V alloy.


(Received December 4, 2002)

Keywords:

mechanical alloying, pulsed current sintering, Ti-2 at%Fe-10 at%Si, nanocrystalline, amorphous


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