Environment-assisted crack nucleation in La(Fe,Mn,Si)13 -based magnetocaloric materials

被引：3

作者：

Wang, Siyang ^{[1
]}

Lovell, Edmund ^{[2
]}

Guo, Liya ^{[3
]}

Wilson, Neil ^{[2
]}

Ryan, Mary P. ^{[1
]}

Giuliani, Finn ^{[1
]}

机构：

[1] Imperial Coll London, Royal Sch Mines, Dept Mat, London SW7 2AZ, England

[2] Cambridge Ltd, Unit B1,Copley Hill Business Pk,Cambridge Rd, Cambridge CB22 3GN, England

[3] Shanghai Univ, Sch Mat Sci & Engn, Shanghai 200444, Peoples R China

来源：

INTERNATIONAL JOURNAL OF REFRIGERATION | 2022年 / 135卷

基金：

英国工程与自然科学研究理事会; “创新英国”项目;

关键词：

Magnetocalorics; Materials; Environment; Crack; Mechanical stability; TEMPERATURE; ALLOYS; LA(FE;

D O I：

10.1016/j.ijrefrig.2021.12.016

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Cracking in La(Fe,Si)(13)-based magnetocaloric materials has been observed to predominantly form around La-rich (La2O3) particles and pose a threat to their long-term structural integrity. To understand the formation of these cracks, FIB cross-sectional polishing followed by SEM characterisation was employed to study local microstructural evolution after air exposure. Results suggest that volume expansion and internal degradation associated with a chemical reaction between La2O3 particles and water/moisture can lead to crack nucleation in the 1:13 phase adjacent to La-rich particles. This observation indicates that the formation of La-rich particles should be suppressed, or their size minimised during material processing to ensure the long-term structural integrity of La(Fe,Mn,Si)(13 )magnetocaloric materials.

引用

页码：1 / 4

页数：4

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