Observation of Pseudopartial Grain Boundary Wetting in the NdFeB-Based Alloy

B. B. Straumal; A. A. Mazilkin; S. G. Protasova; G. Schütz; A. B. Straumal; B. Baretzky

doi:10.1007/s11665-015-1872-8

Observation of Pseudopartial Grain Boundary Wetting in the NdFeB-Based Alloy

B. B. Straumal, A. A. Mazilkin, S. G. Protasova, G. Schütz, A. B. Straumal, B. Baretzky

Research output: Contribution to journal › Article › peer-review

38 Scopus citations

Abstract

The NdFeB-based alloys were invented in 1980s and remain the best-known hard magnetic alloys. In order to reach the optimum magnetic properties, the grains of hard magnetic Nd₂Fe₁₄B phase have to be isolated from one another by the (possibly thin) layers of a non-ferromagnetic Nd-rich phase. In this work, we observe that the few-nanometer-thin layers of the Nd-rich phase appear between Nd₂Fe₁₄B grains due to the pseudopartial grain boundary (GB) wetting. Namely, some Nd₂Fe₁₄B/Nd₂Fe₁₄B GBs are not completely wetted by the Nd-rich melt and have the high contact angle with the liquid phase and, nevertheless, contain the 2-4-nm-thin uniform Nd-rich layer.

Original language	English
Pages (from-to)	3303-3309
Number of pages	7
Journal	Journal of Materials Engineering and Performance
Volume	25
Issue number	8
DOIs	https://doi.org/10.1007/s11665-015-1872-8
State	Published - 1 Aug 2016
Externally published	Yes

Keywords

grain boundaries
hard magnetic materials
phase transitions
wetting

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title = "Observation of Pseudopartial Grain Boundary Wetting in the NdFeB-Based Alloy",

abstract = "The NdFeB-based alloys were invented in 1980s and remain the best-known hard magnetic alloys. In order to reach the optimum magnetic properties, the grains of hard magnetic Nd2Fe14B phase have to be isolated from one another by the (possibly thin) layers of a non-ferromagnetic Nd-rich phase. In this work, we observe that the few-nanometer-thin layers of the Nd-rich phase appear between Nd2Fe14B grains due to the pseudopartial grain boundary (GB) wetting. Namely, some Nd2Fe14B/Nd2Fe14B GBs are not completely wetted by the Nd-rich melt and have the high contact angle with the liquid phase and, nevertheless, contain the 2-4-nm-thin uniform Nd-rich layer.",

keywords = "grain boundaries, hard magnetic materials, phase transitions, wetting",

author = "Straumal, {B. B.} and Mazilkin, {A. A.} and Protasova, {S. G.} and G. Sch{\"u}tz and Straumal, {A. B.} and B. Baretzky",

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doi = "10.1007/s11665-015-1872-8",

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AU - Straumal, B. B.

AU - Mazilkin, A. A.

AU - Protasova, S. G.

AU - Schütz, G.

AU - Straumal, A. B.

AU - Baretzky, B.

PY - 2016/8/1

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N2 - The NdFeB-based alloys were invented in 1980s and remain the best-known hard magnetic alloys. In order to reach the optimum magnetic properties, the grains of hard magnetic Nd2Fe14B phase have to be isolated from one another by the (possibly thin) layers of a non-ferromagnetic Nd-rich phase. In this work, we observe that the few-nanometer-thin layers of the Nd-rich phase appear between Nd2Fe14B grains due to the pseudopartial grain boundary (GB) wetting. Namely, some Nd2Fe14B/Nd2Fe14B GBs are not completely wetted by the Nd-rich melt and have the high contact angle with the liquid phase and, nevertheless, contain the 2-4-nm-thin uniform Nd-rich layer.

AB - The NdFeB-based alloys were invented in 1980s and remain the best-known hard magnetic alloys. In order to reach the optimum magnetic properties, the grains of hard magnetic Nd2Fe14B phase have to be isolated from one another by the (possibly thin) layers of a non-ferromagnetic Nd-rich phase. In this work, we observe that the few-nanometer-thin layers of the Nd-rich phase appear between Nd2Fe14B grains due to the pseudopartial grain boundary (GB) wetting. Namely, some Nd2Fe14B/Nd2Fe14B GBs are not completely wetted by the Nd-rich melt and have the high contact angle with the liquid phase and, nevertheless, contain the 2-4-nm-thin uniform Nd-rich layer.

KW - grain boundaries

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Observation of Pseudopartial Grain Boundary Wetting in the NdFeB-Based Alloy

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Keywords

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