Paper Title:
Tailoring the Magnetic Properties of Ferritic Alloys by HPT
  Abstract

Industrial available FeSi, FeCo and FeNi alloys with an initial grain size of 20-50 m were subjected to Severe Plastic Deformation (SPD) up to strain levels where a saturation of the microstructural refinement is observed. For both SPD conditions, ambient temperature (293 K) and liquid nitrogen temperature (77 K), the microstructure of the severely deformed state is analysed by Back Scattered Electrons (BSE) micrographs captured in a SEM. Additionally, samples that were deformed at 77 K are examined in a Transmission Electron Microscope (TEM). The magnetic properties were characterised by means of SQUID-magnetography providing information about the magnetization behaviour of the material in the as-processed state. Depending on the SPD conditions the mean microstructural sizes in the steady state are about 100-150 nm and 30-80 nm at 293 K and 77 K, respectively. The small microstructural sizes influence significantly the magnetic properties of these ferritic alloys. The initial soft-magnetic behaviour of the coarse grained state shifts towards a hard-magnetic with decreasing crystallite size. For crystallite sizes smaller than ~80 nm the magnetic properties become again more soft-magnetic. The experiments show that very low coercitivity can be obtained by SPD if the grain size is smaller than ~50 nm.

  Info
Periodical
Materials Science Forum (Volumes 584-586)
Edited by
Yuri Estrin and Hans Jürgen Maier
Pages
923-928
DOI
10.4028/www.scientific.net/MSF.584-586.923
Citation
S. Scheriau, K. Rumpf, S. Kleber, R. Pippan, "Tailoring the Magnetic Properties of Ferritic Alloys by HPT", Materials Science Forum, Vols. 584-586, pp. 923-928, 2008
Online since
June 2008
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Yuri Estrin, Ralph Jörg Hellmig, Hyoung Seop Kim
29
Authors: T. Shanmugasundaram, V. Subramanya Sarma, B.S. Murty, Martin Heilmaier
Abstract:The microstructure and mechanical properties of nano-crystalline 2219 Al alloy (Al-6.4Cu-0.29Mn, all in wt %) was studied. Nanocrystalline...
97
Authors: Ilya Nikulin, Rustam Kaibyshev
Tuesday
Abstract:Grain refinement taking place in a commercial 7055 aluminum alloy under equal channel angular pressing (ECAP) was examined in the temperature...
317
Authors: Moustafa El-Tahawy, Jenő Gubicza, Yi Huang, Hye Lim Choi, Hee Man Choe, János L. Lábár, Terence G. Langdon
Chapter 2: Contributed Papers
Abstract:The evolution of phase composition, microstructure and hardness in 316L austenitic stainless steel processed by high-pressure torsion (HPT)...
502