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Title: Annealing behavior of high permeability amorphous alloys

Abstract

Effects of low temperature annealing on the magnetic properties of the amorphous alloy Co/sub 71/ /sub 4/Fe/sub 4/ /sub 6/Si/sub 9/ /sub 6/B/sub 14/ /sub 4/ were investigated. Annealing this alloy below 400/sup 0/C results in magnetic hardening; annealing above 400/sup 0/C but below the crystallization temperature results in magnetic softening. Above the crystallization temperature the alloy hardens drastically and irreversibly. Conventional and high resolution transmission electron microscopy were used to show that the magnetic property changes at low temperatures occur while the alloy is truly amorphous. By imaging the magnetic microstructures, Lorentz electron microscopy has been able to detect the presence of microscopic inhomogeneities in this alloy. The low temperature annealing behavior of this alloy has been explained in terms of atomic pair ordering in the presence of the internal molecular field. Lorentz electron microscopy has been used to confirm this explanation.

Authors:
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
OSTI Identifier:
5225812
Report Number(s):
LBL-10995
TRN: 80-014701
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Resource Relation:
Other Information: Thesis
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BORON ALLOYS; MAGNETIC PROPERTIES; COBALT BASE ALLOYS; IRON ALLOYS; SILICON ALLOYS; AMORPHOUS STATE; ANNEALING; CRYSTAL STRUCTURE; PERMEABILITY; ALLOYS; COBALT ALLOYS; HEAT TREATMENTS; PHYSICAL PROPERTIES; 360104* - Metals & Alloys- Physical Properties

Citation Formats

Rabenberg, L. Annealing behavior of high permeability amorphous alloys. United States: N. p., 1980. Web. doi:10.2172/5225812.
Rabenberg, L. Annealing behavior of high permeability amorphous alloys. United States. https://doi.org/10.2172/5225812
Rabenberg, L. 1980. "Annealing behavior of high permeability amorphous alloys". United States. https://doi.org/10.2172/5225812. https://www.osti.gov/servlets/purl/5225812.
@article{osti_5225812,
title = {Annealing behavior of high permeability amorphous alloys},
author = {Rabenberg, L},
abstractNote = {Effects of low temperature annealing on the magnetic properties of the amorphous alloy Co/sub 71/ /sub 4/Fe/sub 4/ /sub 6/Si/sub 9/ /sub 6/B/sub 14/ /sub 4/ were investigated. Annealing this alloy below 400/sup 0/C results in magnetic hardening; annealing above 400/sup 0/C but below the crystallization temperature results in magnetic softening. Above the crystallization temperature the alloy hardens drastically and irreversibly. Conventional and high resolution transmission electron microscopy were used to show that the magnetic property changes at low temperatures occur while the alloy is truly amorphous. By imaging the magnetic microstructures, Lorentz electron microscopy has been able to detect the presence of microscopic inhomogeneities in this alloy. The low temperature annealing behavior of this alloy has been explained in terms of atomic pair ordering in the presence of the internal molecular field. Lorentz electron microscopy has been used to confirm this explanation.},
doi = {10.2172/5225812},
url = {https://www.osti.gov/biblio/5225812}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jun 01 00:00:00 EDT 1980},
month = {Sun Jun 01 00:00:00 EDT 1980}
}