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Vibrational entropy-enhanced magnetocaloric effect in Mn-rich high-entropy alloys

机译:富有振动熵增强的MN高熵合金中的磁热效应

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摘要

We investigate the Al_xCr_(0.2)MnFe_(0.5)Co_(0.3)Ni_(0.5) (0.3 ≤ x ≤ 0.7) high-entropy alloys by combining experimental and theoretical techniques. X-ray diffraction and magnetization measurements indicate that Al alters the crystal structure and the entropy change upon magnetization-demagnetization while keeping the Curie temperature almost unchanged. First-principles calculations of the vibrational, magnetic, electronic, and configurational entropies show that the leading entropy change is due to the magnetic and vibrational degrees of freedom. The presence of the body-centered-cubic phase, showing a sizable elastic softening upon magnetic transition, brings about the substantial magnetocaloric effect in this family of alloys.
机译:通过组合实验和理论技术,我们研究AL_XCR_(0.2)MNFE_(0.5)CO_(0.5)(0.5)(0.3)(0.3)(0.3≤0.7)的高熵合金。 X射线衍射和磁化测量表明Al改变了晶体结构,并且在磁化 - 退磁时改变熵,同时保持居里温度几乎不变。 振动,磁,电子和配置熵的第一原理计算表明,领先的熵变化是由于磁性和振动的自由度。 在磁性转变上显示体为立立方相的存在,显示了在该合金家族中的显着磁热效应。

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  • 来源
    《Applied Physics Letters》 |2021年第8期|084102.1-084102.5|共5页
  • 作者单位

    Faculty of Materials Science and Chemistry China University of Geosciences Wuhan 430074 China Department of Physics and Astronomy Division of Materials Theory Uppsala University Uppsala SE-751 20 Sweden;

    State Key Laboratory of Mechanical Transmissions College of Materials Science and Engineering Chongqing University Chongqing 400044 China National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing 400044 China;

    Department of Materials Engineering Isfahan University of Technology Isfahan 8415683111 Iran Department of Materials Science and Engineering Royal Institute of Technology Stockholm SE-100 44 Sweden;

    Department of Materials Science and Engineering Royal Institute of Technology Stockholm SE-100 44 Sweden;

    AB Sandvik Materials Technology R&D Center Sandviken SE-811 81 Sweden Division of Engineering Materials Department of Management and Engineering Linkoeping University Linkoeping SE-581 83 Sweden;

    Institute for Solid State Physics and Optics Wigner Research Centre for Physics Budapest H-1525 Hungary;

    Department of Physics and Astronomy Division of Materials Theory Uppsala University Uppsala SE-751 20 Sweden School of Science and Technology OErebro University OErebro SE-701 82 Sweden;

    Department of Physics and Astronomy Division of Materials Theory Uppsala University Uppsala SE-751 20 Sweden Department of Materials Science and Engineering Royal Institute of Technology Stockholm SE-100 44 Sweden Institute for Solid State Physics and Optics Wigner Research Centre for Physics Budapest H-1525 Hungary;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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