63rd Magnetic Materials Center Seminar
November 19, 2007, 15:30-
8th floor seminar room, Sengen
Spin polarization dependence on K vector in FeCo alloy thinfilms and some interesting Heusler alloys.
A. Rajanikanth
Fe50Co50 alloy has shown an MR of 10% in a ballistic magnetoresistance. Its a well known fact that this alloy has a spin polarization of 50%. From the Buttler calculations it was predicted that this alloy also can have similar half-metallic nature like pure Fe in (001) k direction. In this seminar I will present some interesting results of spin polarization of MBE grown FeCo thin films.

Mg-Ca alloys of age hardening development
R. Watanabe
Mg-Ca alloy has good combination of strength ,creep resistance ,and low cost. Nie reported age hardening response of mg-ca alloy can be improved by added small amount of Zn. An small amount of Zn to Mg-Ca alloy was investigated by J.C. Oh et all. On the other hand, An excess amount of Zn to Mg-Ca alloy was not almost investigated. In this presentation, I would explain the precipitation process of an excess amount of Zn to Mg-Ca alloy.

Mechanical property and microstructure of nanocrystalline Al-Fe alloy
T. Sasaki
Previouss reort has shown the excellent mechanical property of the nanocrystalline Al-Fe alloy processed by the mechanical alloying nad sprk plasma sintering, there are still many problems to be solved. For example, they are the poor elevated temperature property, tensile ductility and the small specimen size.
The result of systematic experiment revealed that the high strength can be achieved in the wide range of temperature from room temperature to 623 K without reducing the plastic strain. In the present talk, some strategies will be suggested for the enhancement of the elevated temperature property of nanocrystalline alloy processed by the combination of mechanical alloyig and consolidation technique in terms of the microstructure control.