NDLI: Testing the Applicability of$ ^{119}$Sn Mössbauer Spectroscopy for the Internal Stress Study in Ternary and Co-Doped Ni-Mn-Sn Metamagnetic Alloys

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Testing the Applicability of$ ^{119}$Sn Mössbauer Spectroscopy for the Internal Stress Study in Ternary and Co-Doped Ni-Mn-Sn Metamagnetic Alloys

Content Provider	MDPI
Author	J. López-García, V. Sánchez-Alarcos, J. Pérez-Landazábal, J. Rodríguez-Velamazán, García, J. Unzueta, I. Recarte, V. Garitaonandia, J. Plazaola, F.
Copyright Year	2021
Abstract	The influence of both the Co addition and the internal stress on the atomic level magnetism is comparatively studied in Ni $_{50}$ Mn $_{37}$ Sn $_{13}$ and Ni $_{45}$ Mn $_{38}$ Sn $_{13}$ Co $_{4}$ alloys by magnetic measurements and $^{119}$ Sn Mössbauer spectroscopy. The results show that the saturation magnetization and the hyperfine field follow the same temperature trend. The internal stress state is investigated by subjecting the samples to milling and annealing treatments, and tracking the singlet component revealed by $^{119}$ Sn Mössbauer spectroscopy. Contrary to what was expected, in the Co-doped Ni-Mn-Sn sample the singlet component can be resolved between the milled and annealed states in both martensite and austenite phases. Therefore, the results demonstrate the feasibility of tracking the singlet component upon the structural recovery in Co-doped Ni-Mn-Sn alloys in a much wider range than in ternary alloys. In addition, it is concluded that the transferred dipolar field at Sn from the neighbor magnetic atoms depends very strongly on the stress field and on the microstructural order surrounding Sn atoms. The observed sensitivity of Sn Mössbauer probe atoms to slight microstructural distortions make $^{119}$ Sn a powerful technique for the characterization of the stress present in Sn containing metamagnetic shape memory alloys.
Starting Page	450
e-ISSN	20754701
DOI	10.3390/met11030450
Journal	Metals
Issue Number	3
Volume Number	11
Language	English
Publisher	MDPI
Publisher Date	2021-03-09
Access Restriction	Open
Subject Keyword	Metals Spectroscopy Metamagnetic Shape Memory Alloys Structural Defects 119sn Mössbauer Spectroscopy Internal Stress
Content Type	Text
Resource Type	Article

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