TY - JOUR
T1 - A strategy for improving inherent brittleness without significantly sacrificing the magnetocaloric effect in a Ni-Mn-Sn Heusler alloy
AU - Zhai, Qiang
AU - Bu, Fan
AU - Cheng, Yuhao
AU - Zhang, Jiaqi
AU - He, Yixuan
N1 - Publisher Copyright:
© 2025 Elsevier B.V.
PY - 2025/10/1
Y1 - 2025/10/1
N2 - The eutectic design, a prevalent strategy for enhancing mechanical properties, aims to address the poor workability caused by the high brittleness of L21 intermetallic phase in Ni-Mn-Sn Heusler alloy as a promising material for solid-state refrigeration. In this study, a eutectic composition of Ni48Co10Mn32Sn10 with a fully L21/γ lamellar structure significantly improves mechanical properties, reaching 1950 MPa fracture strength and 20.5 % ductility. However, the desired magnetocaloric effect (MCE) is completely inhibited due to a strong Kurdyumov and Sachs orientation relationship (K-S OR) between eutectic phases. To overcome these challenges, a solution to precipitate primary L21 phase is proposed. This approach breaks the K-S OR by promoting epitaxial growth of the L21 eutectic phase on the primary L21 phase. Consequently, the hypoeutectic Ni48Co8Mn34Sn10 composition achieves an excellent balance between MCE and mechanical properties, with a maximum magnetic entropy change of 10.13 J kg−1 K−1 under 5 T magnetic field, 1894 MPa fracture strength, and 18.4 % ductility. Our strategy overcomes inherent brittleness without significantly sacrificing the magnetocaloric effect within Ni-Mn-Sn alloys. This study is pivotal for optimizing the structural design and properties of Ni-Mn based Heusler alloys.
AB - The eutectic design, a prevalent strategy for enhancing mechanical properties, aims to address the poor workability caused by the high brittleness of L21 intermetallic phase in Ni-Mn-Sn Heusler alloy as a promising material for solid-state refrigeration. In this study, a eutectic composition of Ni48Co10Mn32Sn10 with a fully L21/γ lamellar structure significantly improves mechanical properties, reaching 1950 MPa fracture strength and 20.5 % ductility. However, the desired magnetocaloric effect (MCE) is completely inhibited due to a strong Kurdyumov and Sachs orientation relationship (K-S OR) between eutectic phases. To overcome these challenges, a solution to precipitate primary L21 phase is proposed. This approach breaks the K-S OR by promoting epitaxial growth of the L21 eutectic phase on the primary L21 phase. Consequently, the hypoeutectic Ni48Co8Mn34Sn10 composition achieves an excellent balance between MCE and mechanical properties, with a maximum magnetic entropy change of 10.13 J kg−1 K−1 under 5 T magnetic field, 1894 MPa fracture strength, and 18.4 % ductility. Our strategy overcomes inherent brittleness without significantly sacrificing the magnetocaloric effect within Ni-Mn-Sn alloys. This study is pivotal for optimizing the structural design and properties of Ni-Mn based Heusler alloys.
KW - Eutectic design
KW - Heusler alloy
KW - K-S orientation relationship
KW - Magnetocaloric effect
KW - Mechanical property
UR - http://www.scopus.com/inward/record.url?scp=105006644416&partnerID=8YFLogxK
U2 - 10.1016/j.jmmm.2025.173246
DO - 10.1016/j.jmmm.2025.173246
M3 - 文章
AN - SCOPUS:105006644416
SN - 0304-8853
VL - 629
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
M1 - 173246
ER -