期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 389, 期 -, 页码 10-20出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2015.04.016
关键词
Permanent magnet; Sintering; Residual stresses; Modeling; Polycrystal
资金
- French Program CARNOT Energies du Futur
Models of polycrystalline microstructures, representative for sintered permanent magnets with various grain size distributions and alignment degrees, were generated by the Voronoi tessellation technique. The polycrystalline models were meshed and then a stress/strain analysis was performed with the Finite Element Method (FEM) in order to derive the relation between the homogenized properties (thermal expansion coefficient, elastic constants) and the degree of grain alignment. Residual stresses after sintering were also analyzed and a possible mechanism involved in the decrease in mechanical strength is discussed, It is argued that small sized and poorly aligned grains dispersed in the polycrystalline material are highly stressed after elaboration and could be responsible for the initiation of failure. (C) 2015 Elsevier B.V. All rights reserved.
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