Microstructure and magnetic property of LaFe^sub 11.6^Si^sub 1.4^ magnetocaloric alloys by a novel short time heat treatment

Microstructure and magnetic property of LaFe^sub 11.6^Si^sub 1.4^ magnetocaloric alloys by a novel short time heat treatment

A long time high temperature annealing (e. g. 1323 K and 7–14 days) is necessary to obtain large volume fraction of NaZn13-type La(Fe,Si)13 phase. In order to get rid of this shortage, this investigation demonstrates a novel short-time continuous descending temperature annealing (CDTA) method for La...

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Veröffentlicht in:Intermetallics 2019-02, Vol.105, p.1
Hauptverfasser: Yang, Liang, Zhou, Zhenni, Feng, Shouteng, Li, Jiehua, Liu, Jian, Li, Jun, Hu, Qiaodan, Li, Jianguo
Format: Artikel
Sprache:eng
Schlagworte:
Annealing
Continuous annealing
Cooling rate
Heat treating
Heat treatment
High temperature
Lamella
Magnetic properties
Microstructure
Organic chemistry
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Zusammenfassung:A long time high temperature annealing (e. g. 1323 K and 7–14 days) is necessary to obtain large volume fraction of NaZn13-type La(Fe,Si)13 phase. In order to get rid of this shortage, this investigation demonstrates a novel short-time continuous descending temperature annealing (CDTA) method for La(Fe,Si)13 magnetocaloric alloys. Within 10 min annealing, ∼81% volume fraction of La(Fe,Si)13 phase and a 9.52 J/kg·K (0–5 T) magnetic entropy change have been obtained. Besides, a lamella-shape microstructure consisting of two phases is observed. The relationship between chemical segregation of La(Fe,Si)13 phase and cooling rate is investigated. The mechanism of CDTA method is analyzed, indicating a different interface movement behavior.
ISSN:0966-9795
1879-0216
DOI:10.1016/j.intermet.2018.11.003