A novel high-entropy alloy with an exceptional combination of soft magnetic properties and corrosion resistance
A novel high-entropy alloy with an exceptional combination of soft magnetic properties and corrosion resistance
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DOI：
10.1007/s40843-022-2171-5
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发表时间：
2022-09
期刊：
影响因子：
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通讯作者：
Jiacheng Duan;Mingliang Wang;R. Huang;Junwei Miao;Yiping Lu;Tongmin Wang;Tingju Li
中科院分区：
文献类型：
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作者：
Jiacheng Duan;Mingliang Wang;R. Huang;Junwei Miao;Yiping Lu;Tongmin Wang;Tingju Li
由于缺乏耐腐蚀性，大多数传统软磁材料（SMMs）在腐蚀性环境中的应用受到限制，特别是在海水中。因此，提高smm的耐腐蚀性是至关重要的。然而，磁性能与耐蚀性之间存在着严重的矛盾，主要的防腐元素Cr具有很强的抗铁磁性，使合金的磁性恶化。本研究旨在报道一种新型的单体心立方高熵合金（Fe2.25Co1.25Cr） 94al6，该合金具有软磁性能、耐腐蚀性和力学性能的最佳组合。HEA的饱和磁化强度高达141.88 emu g−1，矫顽力仅为2.9 Oe，优于大多数已报道的磁性HEAs和常规合金。在模拟海水介质中，HEA的耐腐蚀性优于304不锈钢、所有软磁HEA和大多数已报道的HEAs。此外，新型HEA具有优异的力学性能，屈服强度达到1100 MPa，压缩断裂应变大于33%，维氏硬度值达到469 HV。因此，这种新型的（Fe2.25Co1.25Cr）94Al6HEA是一种很有前途的海洋环境SMM。
The lack of corrosion resistance limits the application of most conventional soft magnetic materials (SMMs) in a corrosive environment, especially in seawater. Hence, enhancing the corrosion resistance of SMMs is critically important. However, a severe contradiction exists between magnetic properties and corrosion resistance as the main anticorrosion element Cr has strong anti-ferromagnetism that deteriorates the magnetism of alloys. This study aimed to report a novel single body-centered cubic high-entropy alloy (HEA) (Fe2.25Co1.25Cr)94Al6with an optimal combination of soft magnetic properties, corrosion resistance, and mechanical properties. The saturation magnetization of the HEA was as high as 141.88 emu g−1and the coercivity was only 2.9 Oe, which were superior to most of the reported magnetic HEAs and conventional alloys. The corrosion resistance of the HEA was better than that of the 304 stainless steel, all of soft magnetic HEAs, and most of the reported HEAs in simulated seawater medium. In addition, the novel HEA exhibited excellent mechanical properties with a yield strength of 1100 MPa, a compressive fracture strain of more than 33%, and an outstanding Vickers hardness value of 469 HV. Thus, this novel (Fe2.25Co1.25Cr)94Al6HEA is a promising SMM for marine environment applications.