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Defect formation in Nd_2Fe_(14)B grains caused by Zn diffusion

机译：Zn扩散在Nd_2Fe_（14）B晶粒中形成缺陷

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摘要

Defect formation in Nd_2Fe_(14)B grains, caused by a low-pressure-pack-sublimation Zn coating process, has been investigated. The results indicate that, in the Zn-affected region, low-angle boundaries decorated with precipitates form within the Nd_2Fe_(14)B grains. Zn, which is almost insoluble in Nd_2Fe_(14)B, diffuses initially along the grain boundaries and it is then thought to cause extrinsic dislocations in the grain boundaries to migrate into the Nd_2Fe_(14)B grains, forming low-angle boundaries. The Zn diffuses along these low-angle boundaries and, when its concentration becomes high enough, it forms precipitates. The precipitates have a (possibly ordered) bcc-based structure with the basic cc lattice parameter a ≈ 0.27 nm and a composition of approximately 77 ± 5 at.% Fe, 11 ± 2 at.% Nd and 12 ± 5 at.% Zn.
机译：研究了低压填充升华锌涂层工艺在Nd_2Fe_（14）B晶粒中形成的缺陷。结果表明，在受锌影响的区域中，Nd_2Fe_（14）B晶粒内形成了由析出物装饰的低角度边界。几乎不溶于Nd_2Fe_（14）B的Zn最初沿晶界扩散，然后被认为导致晶界中的外在位错迁移到Nd_2Fe_（14）B晶粒中，形成低角度边界。 Zn沿着这些低角度边界扩散，当其浓度足够高时，它会形成沉淀。沉淀物具有（可能有序）基于bcc的结构，基本cc晶格参数a≈0.27 nm，且组成约为77±5 at。％Fe，11±2 at。％Nd和12±5 at。％Zn 。

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