Zhigang Zheng, Pengyan Huang, Xinglin Chen, Hongyu Wang, Shan Da, Gang Wang, Zhaoguo Qiu, Dechang Zeng
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We investigate why <i>c<sub>hexagonal</sub></i>/<i>a<sub>hexagonal</sub></i> (<i>c<sub>hexa</sub></i>/<i>a<sub>hexa</sub></i>) gradually increases upon Co substitution, while phase transition temperature (<i>T<sub>tr</sub></i>) and isothermal magnetic entropy change (Δ<i>S<sub>M</sub></i>) tend to gradually decrease. In particular, the <i>x</i> = 0.4 alloy with remarkable magnetocaloric properties is obtained by tuning Co/Ni, which shows a giant entropy change of 48.5 J∙kg<sup>-1</sup>K<sup>-1</sup> at 309 K for 5 T and an adiabatic temperature change (Δ<i>T<sub>ad</sub></i>) of 8.6 K at 306.5 K. Moreover, the <i>x</i> = 0.55 HEA shows great hardness and compressive strength with values of 552 HV2 and 267 MPa, respectively, indicating that the mechanical properties undergo an effective enhancement. The large Δ<i>S<sub>M</sub></i> and Δ<i>T<sub>ad</sub></i> may enable the MnNiSi-based HEAs to become a potential commercialized magnetocaloric material.</p>","PeriodicalId":11694,"journal":{"name":"Entropy","volume":"26 9","pages":""},"PeriodicalIF":2.1000,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11431282/pdf/","citationCount":"0","resultStr":"{\"title\":\"Enhanced Magnetocaloric Properties of the (MnNi)<sub>0.6</sub>Si<sub>0.62</sub>(FeCo)<sub>0.4</sub>Ge<sub>0.38</sub> High-Entropy Alloy Obtained by Co Substitution.\",\"authors\":\"Zhigang Zheng, Pengyan Huang, Xinglin Chen, Hongyu Wang, Shan Da, Gang Wang, Zhaoguo Qiu, Dechang Zeng\",\"doi\":\"10.3390/e26090799\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>In order to improve the magnetocaloric properties of MnNiSi-based alloys, a new type of high-entropy magnetocaloric alloy was constructed. 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引用次数: 0
摘要
为了改善锰镍硅基合金的磁致性，我们构建了一种新型高熵磁致性合金。在这项研究中，我们发现 Mn0.6Ni1-xSi0.62Fe0.4CoxGe0.38（x = 0.4、0.45 和 0.5）呈现出从高温 Ni2In 型相到低温 TiNiSi 型相的磁结构一阶相变，从而使合金实现了巨大的磁致效应。我们研究了为什么 Co 取代后，弊方/六方（chexa/hexa）逐渐增加，而相变温度（Ttr）和等温磁熵变化（ΔSM）却趋于逐渐降低。此外，x = 0.55 HEA 的硬度和抗压强度很高，分别达到 552 HV2 和 267 MPa，表明其力学性能得到了有效提高。较大的 ΔSM 和 ΔTad 可能使锰硅基 HEA 成为一种潜在的商业化磁致性材料。
Enhanced Magnetocaloric Properties of the (MnNi)0.6Si0.62(FeCo)0.4Ge0.38 High-Entropy Alloy Obtained by Co Substitution.
In order to improve the magnetocaloric properties of MnNiSi-based alloys, a new type of high-entropy magnetocaloric alloy was constructed. In this work, Mn0.6Ni1-xSi0.62Fe0.4CoxGe0.38 (x = 0.4, 0.45, and 0.5) are found to exhibit magnetostructural first-order phase transitions from high-temperature Ni2In-type phases to low-temperature TiNiSi-type phases so that the alloys can achieve giant magnetocaloric effects. We investigate why chexagonal/ahexagonal (chexa/ahexa) gradually increases upon Co substitution, while phase transition temperature (Ttr) and isothermal magnetic entropy change (ΔSM) tend to gradually decrease. In particular, the x = 0.4 alloy with remarkable magnetocaloric properties is obtained by tuning Co/Ni, which shows a giant entropy change of 48.5 J∙kg-1K-1 at 309 K for 5 T and an adiabatic temperature change (ΔTad) of 8.6 K at 306.5 K. Moreover, the x = 0.55 HEA shows great hardness and compressive strength with values of 552 HV2 and 267 MPa, respectively, indicating that the mechanical properties undergo an effective enhancement. The large ΔSM and ΔTad may enable the MnNiSi-based HEAs to become a potential commercialized magnetocaloric material.
期刊介绍：
Entropy (ISSN 1099-4300), an international and interdisciplinary journal of entropy and information studies, publishes reviews, regular research papers and short notes. Our aim is to encourage scientists to publish as much as possible their theoretical and experimental details. There is no restriction on the length of the papers. If there are computation and the experiment, the details must be provided so that the results can be reproduced.
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