Magnetic properties of nanocrystalline mechanically alloyed Fe-M (M=Al, Si, Cu)

Author

Kuhrt, C. ; Schultz, L.

Author_Institution

Siemens AG, Erlangen, Germany

Volume

29

Issue

6

fYear

1993

fDate

11/1/1993 12:00:00 AM

Firstpage

2667

Lastpage

2669

Abstract

Fe_100-xM_x powder blends with M=Al, Si and Cu and x⩽50 are mechanically alloyed. In all three alloy systems, disordered bcc solid solutions are formed which are unstable in the immiscible Fe-Cu system. A nanocrystalline state with average grain sizes of 15-30 nm and high internal strain is established. The saturation magnetization of mechanically alloyed Fe-Al and Fe-Si is very similar to that of the corresponding as-cast alloys. For the unstable Fe-Cu alloys, it behaves like a simple magnetic solution up to a Cu content of 30 at.%. Relatively high coercivities of up to 40 A/cm occur, indicating a predominant influence of internal stresses on the soft magnetic behavior via magnetostriction. The lowest coercivity of 3 A/cm is measured for Fe₉₀Cu₁₀

Keywords

aluminium alloys; copper alloys; ferromagnetic properties of substances; grain size; internal stresses; iron alloys; magnetic properties of fine particles; magnetostriction; mechanical alloying; nanostructured materials; powder metallurgy; silicon alloys; Cu content; Fe-Si; Fe_100-xAl_x powder blends; Fe₉₀Cu₁₀; average grain sizes; coercivities; disordered bcc solid solutions; immiscible Fe-Cu system; internal strain; internal stresses; magnetic properties; magnetic solution; magnetostriction; nanocrystalline mechanically alloyed Fe-Al; nanocrystalline state; saturation magnetization; soft magnetic behavior; Coercive force; Copper alloys; Iron alloys; Magnetic properties; Magnetostriction; Powders; Saturation magnetization; Silicon alloys; Soft magnetic materials; Solids;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.280831

Filename

280831