Preparation and Magnetic Properties of Ball-Milled and Subsequently Hot Pressed Fe77Al2.14Ga0.86P8.4C5B4Si2.6 Bulk Metallic Glass

Ball milling of glassy melt-spun ribbons and subsequent consolidat i n of the resulting powder in the supercooled liquid region were used to prepare bulk glassy Fe77Al 2.14Ga0.86P8.4C5B4Si2.6 discs with a diameter of 10 mm and a thickness of 3 mm. The hig h stability against crystallization together with the low viscos ity of the alloy in the temperature range of the supercooled liquid region allow the preparation of bulk samples by hot pressing of the powder while maintaining the glassy nature of the sample. The stre ss introduced into the material by ball milling leads to an increase of the coercivity from about 5 10 Am for the melt-spun ribbon to about 2200 2500 Am -1 for 1 hour ball-milled powder. Subsequent annealing of the ballmilled powder in the supercooled liquid region leads to a decrease of th coercivity by a factor of 10. The bulk samples prepared by combination of ball-milling of the crushe d ribbons and hot pressing show a coercivity of about 120 140 Am .

[1]  A. Makino,et al.  Soft Magnetic Properties of Ring Shape Bulk Glassy Fe–Al–Ga–P–C–B–Si Alloy Prepared by Copper Mold Casting , 1999 .

[2]  J. Eckert,et al.  Thermal and magnetic properties of bulk glass forming Fe-Al-P-C-B-(Ga) alloys , 1999 .

[3]  A. Makino,et al.  Influence of Si addition on thermal stability and soft magnetic properties for Fe–Al–Ga–P–C–B glassy alloys , 1998 .

[4]  J. Eckert,et al.  Effect of oxygen on phase formation and thermal stability of slowly cooled Zr65Al7.5Cu17.5Ni10 metallic glass , 1998 .

[5]  J. Eckert,et al.  Crystallization Behavior and Phase Formation in Zr–Al–Cu–Ni Metallic Glass Containing Oxygen , 1998 .

[6]  A. Makino,et al.  Thermal stability and magnetic properties of Fe-Al-Ga-P-C-B-Si amorphous thick sheets , 1997 .

[7]  A. Makino,et al.  Thermal and Magnetic Properties of Fe56Co7Ni7Zr10−xNbxB20 Amorphous Alloys with Wide Supercooled Liquid Range , 1997 .

[8]  A. Takeuchi,et al.  Bulk amorphous alloys with high mechanical strength and good soft magnetic properties in Fe–TM–B (TM=IV–VIII group transition metal) system , 1997 .

[9]  A. Inoue.  Bulk amorphous alloys with soft and hard magnetic properties , 1997 .

[10]  A. Makino,et al.  SOFT MAGNETIC PROPERTIES OF FE BASED AMORPHOUS THICK SHEETS WITH LARGE GLASS FORMING ABILITY , 1997 .

[11]  A. Takeuchi,et al.  Thermal Stability and Magnetic Properties of Bulk Amorphous Fe–Al–Ga–P–C–B–Si Alloys , 1997 .

[12]  A. Inoue,et al.  Effect of Additional Elements (M) on the Thermal Stability of Supercooled Liquid in Fe72−xAl5Ga2P11C6B4Mx Glassy Alloys , 1996 .

[13]  A. Inoue,et al.  Fe-Based Ferromagnetic Glassy Alloys with Wide Supercooled Liquid Region , 1995 .

[14]  A. Inoue,et al.  Multicomponent Fe-Based Glassy Alloys with Wide Supercooled Liquid Region before Crystallization , 1995 .