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Title: Characterization of rare earth permanent magnets

Recently developed alloys based either on ternary phases such as Nd{sub 2}Fe{sub 14}B (2--14) or on iron-rich pseudobinaries with the ThMn{sub 12}-structure combine excellent intrinsic magnetic properties with the appropriate microstructure for applications as hard magnetic materials. In order to understand the magnetic behavior of these materials, systematic microstructural characterization has been performed using microdiffraction, x-ray microanalyses and high resolution electron microscopy. The magnetic behavior of three types of NdFeB specimens, namely sintered, mechanically alloyed and melt-spun, is correlated to their microstructure. The effect of minority phases on the magnetization and the coercivity in these materials is investigated. The ease with which the nonmagnetic Nd-rich grain boundary phase decouples hard magnetic 2--14'' matrix grains depends on their average grain size which is related to the different preparation processes. 20 refs., 5 figs., 1 tab.
Authors:
;
Publication Date:
OSTI Identifier:
5412797
Report Number(s):
LBL-29553; CONF-901059--1
ON: DE91017010
DOE Contract Number:
AC03-76SF00098
Resource Type:
Conference
Resource Relation:
Conference: 11. international workshop on rare earth magnets and their applications and 6th international symposium on magnetic anisotropy and coercivity in rare earth-transition metal alloys, Pittsburgh, PA (United States), 21-24 Oct 1990
Research Org:
Lawrence Berkeley Lab., CA (United States)
Sponsoring Org:
DOE; AVHFOUN; USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BORON ALLOYS; MAGNETIC PROPERTIES; MICROSTRUCTURE; IRON BASE ALLOYS; NEODYMIUM ALLOYS; SAMARIUM ALLOYS; TITANIUM ALLOYS; ANNEALING; COLD WORKING; GRAIN SIZE; INTERMETALLIC COMPOUNDS; PERMANENT MAGNETS; SINTERING; TRANSMISSION ELECTRON MICROSCOPY; ALLOYS; CRYSTAL STRUCTURE; ELECTRON MICROSCOPY; FABRICATION; HEAT TREATMENTS; IRON ALLOYS; MAGNETS; MATERIALS WORKING; MICROSCOPY; PHYSICAL PROPERTIES; RARE EARTH ALLOYS; SIZE 360102* -- Metals & Alloys-- Structure & Phase Studies; 360104 -- Metals & Alloys-- Physical Properties