The glass forming abilities and magnetic properties of Fe–Al–Ga–P–B–Si and Fe–Al–Ga–P–B–C alloys

✍ Scribed by P. Pawlik; H.A. Davies; M.R.J. Gibbs

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 322 KB
• Volume: 375-377
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2003.10.165

✦ Synopsis

An investigation of glass forming abilities and thermal properties of Fe 76-x Al 4 P 12 Ga x B 4 Si 4 and Fe 75-x Al 5 P 11 Ga x B 4 C 5 (where x = 0, 2, 5) soft magnetic alloys was carried out using melt-spun ribbons of various thicknesses and suction cast rods of various diameters. For the Si-containing alloys, the critical thickness of amorphous ribbon increased from 55 to 110 m between x = 0 and 5. On the other hand, for the carbon containing alloys, increasing x from 0 to 5 resulted in a decrease in critical thickness of amorphous ribbon from 150 to 100 m.

These data allowed the critical diameter of glassy cylindrical samples D c to be estimated for appropriate alloy compositions and these are compared with experimental observations for suction cast rods. The magnetic properties, including the hysteresis loops and coercivity i H c , were determined by dc inductive magnetometry.

The results indicate surprisingly low values of i H c , even for partially crystalline samples. On the other hand, the hysteresis loop shapes suggest a relatively large value of magnetic anisotropy. The possible reason for this behaviour is discussed.