Coercivity kinetics upon step annealing of sintered Sm(Co0.88-xFexCu0.09Zr0.03)7 magnets

被引：16

作者：

Popov, A. G. ^{[2
]}

Golovnia, O. A. ^{[1
,2
]}

Protasov, A., V ^{[1
,2
]}

Gaviko, V. S. ^{[1
,2
]}

Kolodkin, D. A. ^{[1
]}

Gopalan, R. ^{[3
]}

机构：

[1] Russian Acad Sci, Ural Branch, MN Miheev Inst Met Phys, Str S Kovalevskoy 18, Ekaterinburg 620990, Russia

[2] Ural Fed Univ, Inst Nat Sci & Math, Ekaterinburg 620002 19, Russia

[3] Int Adv Res Ctr Powder Met & New Mat ARCI, IITM Res Pk, Chennai 600113, Tamil Nadu, India

来源：

JOURNAL OF RARE EARTHS | 2019年 / 37卷 / 10期

关键词：

Sm-Co-Fe-Cu-Zr; Permanent magnet; Sm2Co17; SmCo5; Coercivity kinetics; MICROSTRUCTURE; FE; CU; MICROCHEMISTRY;

D O I：

10.1016/j.jre.2019.04.009

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Behavior of the coercivity of the high-temperature Sm(Co-0.88-xFexCu0.09Zr0.03)(7) magnets depending on the temperature and time of annealing with the temperature decreasing stepwise from 700 to 400 degrees C was investigated. It is shown that the growth rate of coercivity abruptly increases at the initial stage of annealing in the vicinity of the Curie temperature of the SmCo5 phase. The origin of the effect is the counter diffusion of Cu and Co atoms through dislocation tubes, which form because of enhanced stresses and a partial breakage of coherent coupling at the interface of the Sm2Co17 and SmCo5 phases. Diffusive enrichment of the SmCo5 phase in Cu close to the interface with Sm2Co17 leads to relaxation of stresses and increases in the gradient of the magnetic domain-wall energy and coercivity. (C) 2019 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.

引用

页码：1059 / 1065

页数：7

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