期刊
APPLIED SCIENCES-BASEL
卷 12, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/app12031748
关键词
magnetic shape memory alloys; NiCoMnAl Heusler alloys; martensitic intercalations; crystalline structure
类别
资金
- DFG priority program Ferroic cooling (SPP 1599) [227087704]
- BMBF joint project DiProMag-Digitalization of a process chain for the production, characterization and prototypical application of magnetocaloric alloys, here the contribution of Bielefeld University [FKZ 13XP5 120B]
The magnetic shape memory Heusler alloy NiCoMnAl exhibits a long-range ordering phenomenon in a 3D checkerboard pattern, with martensite and austenite regions distinguished by their brightness in TEM cross sections. The nucleation process is thought to be triggered by inhomogeneous local elastic stray fields of primary martensitic nuclei in the austenite matrix, limited by the thicknesses of the martensite and austenite thin films.
Magnetic shape memory Heusler alloys, such as NiCoMnAl, are considered as promising candidates for magnetocaloric cooling applications. Grown in thin film systems of adjacent layers with austenite and martensite crystal structures of almost equal thicknesses, a long-range ordering phenomenon in the shape of a 3D checkerboard pattern occurs in NiCoMnAl samples. The crystallographic origin of the pattern is proven by transmission electron microscopy (TEM) techniques. The darker fields of the arrangement consist of martensite nuclei superposed with austenite, while the purely austenite regions appear bright in TEM cross sections. The nucleation process is presumably triggered by inhomogeneous local elastic stray fields of primary martensitic nuclei in the austenite matrix and limited by the thicknesses of the martensite and austenite thin films.
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