Giant negative thermal expansion in Fe-Mn-Ga magnetic shape memory alloys

X. M. Sun; D. Y. Cong; Y. Ren; D. E. Brown; R. G. Li; S. H. Li; Z. Yang; W. X. Xiong; Z. H. Nie; L. Wang; Y. D. Wang

doi:10.1063/1.5038860

Giant negative thermal expansion in Fe-Mn-Ga magnetic shape memory alloys

X. M. Sun, D. Y. Cong, Y. Ren, D. E. Brown, R. G. Li, S. H. Li, Z. Yang, W. X. Xiong, Z. H. Nie, L. Wang, Y. D. Wang

School of Material Science and Engineering

Research output: Contribution to journal › Article › peer-review

28 Citations (Scopus)

Abstract

Fe-Mn-Ga magnetic shape memory alloys can undergo martensitic transformation (MT) from a paramagnetic cubic phase to a ferromagnetic tetragonal phase. The MT is accompanied by a large volume change; yet, these alloys have never been explored for technological applications as negative thermal expansion (NTE) materials. Here, by careful chemical modification, tunable NTE characteristics including wide operating temperature windows (ΔT) and large negative linear coefficients of thermal expansion (α_l) have been achieved in Fe_44- _xMn₂₈Ga₂₈₊ _x (x = 1, 2, and 2.5) alloys. Typically, a giant NTE ΔT of 81 K and α_l = -50.2 × 10^-6K^-1 were realized in the Fe₄₃Mn₂₈Ga₂₉ alloy upon cooling from 290 K. The relationships between the NTE features, the MT, and the substitution of Ga for Fe were discussed. Furthermore, the Fe-Mn-Ga alloys possess excellent mechanical properties, high electrical conductivity and high thermal conductivity. With these advantages, the Fe-Mn-Ga magnetic shape memory alloys show promising prospects for use as advanced NTE materials.

Original language	English
Article number	041903
Journal	Applied Physics Letters
Volume	113
Issue number	4
DOIs	https://doi.org/10.1063/1.5038860
Publication status	Published - 23 Jul 2018

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title = "Giant negative thermal expansion in Fe-Mn-Ga magnetic shape memory alloys",

abstract = "Fe-Mn-Ga magnetic shape memory alloys can undergo martensitic transformation (MT) from a paramagnetic cubic phase to a ferromagnetic tetragonal phase. The MT is accompanied by a large volume change; yet, these alloys have never been explored for technological applications as negative thermal expansion (NTE) materials. Here, by careful chemical modification, tunable NTE characteristics including wide operating temperature windows (ΔT) and large negative linear coefficients of thermal expansion (αl) have been achieved in Fe44- xMn28Ga28+ x (x = 1, 2, and 2.5) alloys. Typically, a giant NTE ΔT of 81 K and αl = -50.2 × 10-6K-1 were realized in the Fe43Mn28Ga29 alloy upon cooling from 290 K. The relationships between the NTE features, the MT, and the substitution of Ga for Fe were discussed. Furthermore, the Fe-Mn-Ga alloys possess excellent mechanical properties, high electrical conductivity and high thermal conductivity. With these advantages, the Fe-Mn-Ga magnetic shape memory alloys show promising prospects for use as advanced NTE materials.",

author = "Sun, {X. M.} and Cong, {D. Y.} and Y. Ren and Brown, {D. E.} and Li, {R. G.} and Li, {S. H.} and Z. Yang and Xiong, {W. X.} and Nie, {Z. H.} and L. Wang and Wang, {Y. D.}",

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doi = "10.1063/1.5038860",

language = "English",

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T1 - Giant negative thermal expansion in Fe-Mn-Ga magnetic shape memory alloys

AU - Sun, X. M.

AU - Cong, D. Y.

AU - Ren, Y.

AU - Brown, D. E.

AU - Li, R. G.

AU - Li, S. H.

AU - Yang, Z.

AU - Xiong, W. X.

AU - Nie, Z. H.

AU - Wang, L.

AU - Wang, Y. D.

PY - 2018/7/23

Y1 - 2018/7/23

N2 - Fe-Mn-Ga magnetic shape memory alloys can undergo martensitic transformation (MT) from a paramagnetic cubic phase to a ferromagnetic tetragonal phase. The MT is accompanied by a large volume change; yet, these alloys have never been explored for technological applications as negative thermal expansion (NTE) materials. Here, by careful chemical modification, tunable NTE characteristics including wide operating temperature windows (ΔT) and large negative linear coefficients of thermal expansion (αl) have been achieved in Fe44- xMn28Ga28+ x (x = 1, 2, and 2.5) alloys. Typically, a giant NTE ΔT of 81 K and αl = -50.2 × 10-6K-1 were realized in the Fe43Mn28Ga29 alloy upon cooling from 290 K. The relationships between the NTE features, the MT, and the substitution of Ga for Fe were discussed. Furthermore, the Fe-Mn-Ga alloys possess excellent mechanical properties, high electrical conductivity and high thermal conductivity. With these advantages, the Fe-Mn-Ga magnetic shape memory alloys show promising prospects for use as advanced NTE materials.

AB - Fe-Mn-Ga magnetic shape memory alloys can undergo martensitic transformation (MT) from a paramagnetic cubic phase to a ferromagnetic tetragonal phase. The MT is accompanied by a large volume change; yet, these alloys have never been explored for technological applications as negative thermal expansion (NTE) materials. Here, by careful chemical modification, tunable NTE characteristics including wide operating temperature windows (ΔT) and large negative linear coefficients of thermal expansion (αl) have been achieved in Fe44- xMn28Ga28+ x (x = 1, 2, and 2.5) alloys. Typically, a giant NTE ΔT of 81 K and αl = -50.2 × 10-6K-1 were realized in the Fe43Mn28Ga29 alloy upon cooling from 290 K. The relationships between the NTE features, the MT, and the substitution of Ga for Fe were discussed. Furthermore, the Fe-Mn-Ga alloys possess excellent mechanical properties, high electrical conductivity and high thermal conductivity. With these advantages, the Fe-Mn-Ga magnetic shape memory alloys show promising prospects for use as advanced NTE materials.

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DO - 10.1063/1.5038860

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SN - 0003-6951

VL - 113

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 4

M1 - 041903

ER -

Giant negative thermal expansion in Fe-Mn-Ga magnetic shape memory alloys

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