Formation of semi-coherent Zr-rich lamellar phase in 2:17-type Sm-Co-Fe-Cu-Zr magnets with high Fe content

被引：0
作者：
Jia, Wentao [1 ,2 ]
Song, Xin [1 ,2 ]
Liu, Yao [1 ,2 ]
Ma, Tianyu [1 ,2 ]
机构：
[1] Xi An Jiao Tong Univ, Frontier Inst Sci & Technol, Xian 710049, Peoples R China
[2] Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China
来源：
MATERIALIA | 2023年 / 28卷
基金：
中国国家自然科学基金;
关键词：
Sm-Co magnets; Interface; Phase transition; Coherency; MICROSTRUCTURE; PRECIPITATION; COERCIVITY; EVOLUTION;
D O I：
10.1016/j.mtla.2023.101755
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The 2:17-type Sm-Co-Fe-Cu-Zr high-temperature magnets exhibit unique cellular nanostructure, with Zr-rich lamellar phase (Z-phase) penetrating through the 2:17R nanocells and 1:5H cell boundaries. In this work, a face-centered cubic (FCC) Zr-rich lamellar phase was identified in an Fe-rich Sm25Co42.9Fe23.5Cu5.6Zr3.0 (wt.%) magnet. The orientation relationship between FCC and 2:17R phases is [100]-2:17 11 [110]-FCC and (001)-2:17R 11 (111)-FCC. Unlike the previously-reported hexagonal or rhombohedral Z-phases that are fully coherent with 2:17R or 1:5H phases, both the broad interphase (111)-FCC/(001)-2:17R and the (224)-FCC/(010)-2:17R interphase at the peripheries of the FCC Z-phase exhibit semi-coherent morphology, due to the large lattice mismatch. The semi-coherent FCC Z-phase can be attributed to the thickening of the coherent Z-phase that gradually loses coherency, as a result of a gradual reduction in elastic strain energy and interfacial energy. This finding may add new insights into the solid-state phase transitions of Sm-Co-based magnets.
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页数：5
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