Monitoring of the hydrogen decrepitation process by acoustic emission

Mateusz Szymański , Jan Płowiec , Bartosz Michalski , Marcin Leonowicz


Acoustic Emission Testing (AT) was applied to monitor the Hydrogen Decrepitation (HD) process for two different NdFeB-type materials: sintered NdFeB magnet and annealed NdFeB ingot alloy. Acoustic signals of clearly different characteristics were acquired for these two materials, indicating different course of the HD process. Acoustic waves of high signal strength and high peak amplitude were generated for the sintered NdFeB magnet whereas acoustic signals of low energy and low intensity were registered for the annealed NdFeB alloy. These findings were supported by real-time visual observation of the HD process. The sintered NdFeB magnet decrepitates rapidly and its particles spatter for a longer distance comparing to the ingot NdFeB alloy. Different behavior of the investigated materials can be explained in relation to their structural properties and manufacturing history. Fine microstructure, homogenously distributed thin layer of the Nd-rich grain boundary phase and stress accumulated after fabrication process can be responsible for more intense characteristic of the HD process in case of the sintered NdFeB magnets.
Author Mateusz Szymański (FMSE / DCFM)
Mateusz Szymański,,
- Division of Construction and Functional Materials
, Jan Płowiec (FMSE / DMD)
Jan Płowiec,,
- Division of Materials Design
, Bartosz Michalski (FMSE / DCFM)
Bartosz Michalski,,
- Division of Construction and Functional Materials
, Marcin Leonowicz (FMSE / DCFM)
Marcin Leonowicz,,
- Division of Construction and Functional Materials
Journal seriesSolid State Sciences, ISSN 1293-2558
Issue year2019
Publication size in sheets0.5
Keywords in EnglishNdFeB magnets; Powder technology; Acoustic testing
ASJC Classification3104 Condensed Matter Physics; 2500 General Materials Science; 1600 General Chemistry
Languageen angielski
SSS_Monitoring_published.pdf 2.84 MB
Score (nominal)70
Score sourcejournalList
ScoreMinisterial score = 70.0, 18-12-2019, ArticleFromJournal
Publication indicators WoS Citations = 0; Scopus Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2017 = 0.787; WoS Impact Factor: 2018 = 2.155 (2) - 2018=1.972 (5)
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