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Title: AEM studies of Sm:Co 2:17 permanent magnet alloys

Abstract

A cast 2:17 alloy with composition Sm 10.5, Co 60.0, Fe 20.6, Cu 7.1, Zr 1.8 at. % was quantitatively analyzed with an analytical electron microscope (AEM). After a 24-h solution heat treatment at 1160 /sup 0/C and rapid cooling, the microstructure was highly twinned, mostly 2:17R. Isothermal aging at 800 /sup 0/C produced the microstructure typical of 2:17 permanent magnets. After 72 h, the 2:17R matrix phase composition was Sm 10.5, Co 61.7, Fe 22.4, Cu 4.8, Zr 0.5 at. %. The coherent boundary and platelet phases were too small to analyze independently, so two phase regions, including the matrix phase, were measured. The procedure yielded excellent results for the boundary phase: Sm 17, Co 33.6, Fe 4.8, Cu 43, Zr 1--2 at. %. Semiquantitative results were obtained for platelet-matrix phase mixtures: Sm 6(5--8), Co 60, Fe 14(13--15), Cu 5, Zr 15(14--17). Selected area diffraction patterns of the platelet could be indexed as with a = 0.5 nm and c = 0.8 nm. These results for the platelet phase differ significantly from those of previous investigations.

Authors:
; ; ;
Publication Date:
Research Org.:
Department of Materials Science and Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
OSTI Identifier:
7017616
Resource Type:
Journal Article
Journal Name:
J. Appl. Phys.; (United States)
Additional Journal Information:
Journal Volume: 64:10
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COBALT ALLOYS; ELECTRON MICROSCOPY; COPPER ALLOYS; IRON ALLOYS; SAMARIUM ALLOYS; ZIRCONIUM ALLOYS; AGING; COOLING; ISOTHERMAL PROCESSES; MATRIX ISOLATION; MICROSTRUCTURE; PERMANENT MAGNETS; VERY HIGH TEMPERATURE; ALLOYS; CRYSTAL STRUCTURE; MAGNETS; MICROSCOPY; RARE EARTH ALLOYS; 360102* - Metals & Alloys- Structure & Phase Studies

Citation Formats

Zhang, B, Blachere, J R, Soffa, W A, and Ray, A E. AEM studies of Sm:Co 2:17 permanent magnet alloys. United States: N. p., 1988. Web. doi:10.1063/1.342240.
Zhang, B, Blachere, J R, Soffa, W A, & Ray, A E. AEM studies of Sm:Co 2:17 permanent magnet alloys. United States. doi:10.1063/1.342240.
Zhang, B, Blachere, J R, Soffa, W A, and Ray, A E. Tue . "AEM studies of Sm:Co 2:17 permanent magnet alloys". United States. doi:10.1063/1.342240.
@article{osti_7017616,
title = {AEM studies of Sm:Co 2:17 permanent magnet alloys},
author = {Zhang, B and Blachere, J R and Soffa, W A and Ray, A E},
abstractNote = {A cast 2:17 alloy with composition Sm 10.5, Co 60.0, Fe 20.6, Cu 7.1, Zr 1.8 at. % was quantitatively analyzed with an analytical electron microscope (AEM). After a 24-h solution heat treatment at 1160 /sup 0/C and rapid cooling, the microstructure was highly twinned, mostly 2:17R. Isothermal aging at 800 /sup 0/C produced the microstructure typical of 2:17 permanent magnets. After 72 h, the 2:17R matrix phase composition was Sm 10.5, Co 61.7, Fe 22.4, Cu 4.8, Zr 0.5 at. %. The coherent boundary and platelet phases were too small to analyze independently, so two phase regions, including the matrix phase, were measured. The procedure yielded excellent results for the boundary phase: Sm 17, Co 33.6, Fe 4.8, Cu 43, Zr 1--2 at. %. Semiquantitative results were obtained for platelet-matrix phase mixtures: Sm 6(5--8), Co 60, Fe 14(13--15), Cu 5, Zr 15(14--17). Selected area diffraction patterns of the platelet could be indexed as with a = 0.5 nm and c = 0.8 nm. These results for the platelet phase differ significantly from those of previous investigations.},
doi = {10.1063/1.342240},
journal = {J. Appl. Phys.; (United States)},
number = ,
volume = 64:10,
place = {United States},
year = {1988},
month = {11}
}