A Novel Soft-Magnetic B2-Based Multiprincipal-Element Alloy with a Uniform Distribution of Coherent Body-Centered-Cubic Nanoprecipitates
A Novel Soft-Magnetic B2-Based Multiprincipal-Element Alloy with a Uniform Distribution of Coherent Body-Centered-Cubic Nanoprecipitates
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一种新型软磁 B2 基多主元合金，具有均匀分布的体心立方纳米沉淀物
DOI：
10.1002/adma.202006723
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发表时间：
2021-03-03
影响因子：
29.4
通讯作者：
Nieh, T. G.
中科院分区：
文献类型：
--
作者：
Ma, Yue;Wang, Qing;Nieh, T. G.
多主元素合金（MPEAs）是一类新型的材料，包括高熵合金，其热力学性质主要由位形熵决定，而不是传统合金中的焓，尤其是在高温下。在此，描述了一种新型软磁性非等原子四元MPEA的设计，通过调整其化学组成来故意操纵其微观结构，使其包含均匀分布在B2相基质中的超细铁磁体心立方（BCC）相干纳米沉淀物（3-7 nm）。新合金Al 1.5Co4Fe2Cr具有高饱和磁化强度（M-S = 135.3emu g（-1））、低矫顽力（H-C = 127.3Am（-1））、高居里温度（T-C = 1061 K）和高电阻率（ρ = 244 μ Ω cm），有望成为软磁材料。更重要的是，这些突出的软磁性能被观察到保留，即使在合金热暴露在873 K为555小时，显然是由于良好的稳定性的相干微观结构。根据化学成分的变化引起的微观结构的变化，讨论了这种新合金的磁性能的多功能性，并将这种合金的增强性能与传统软磁合金的性能进行了直接比较。该观点还涉及到设计高性能的软磁合金的高温应用。
Multiprincipal-element alloys (MPEAs), including high-entropy alloys, are a new class of materials whose thermodynamical properties are mainly driven by configuration entropy, rather than enthalpy in the traditional alloys, especially at high temperatures. Herein, the design of a novel soft-magnetic nonequiatomic, quaternary MPEA is described, via tuning its chemical composition to deliberately manipulate its microstructure, such that it contains ultrafine ferromagnetic body-centered-cubic (BCC) coherent nanoprecipitates (3-7 nm) uniformly distributed in a B2-phase matrix. The new alloy Al1.5Co4Fe2Cr exhibits high saturation magnetization (M-S = 135.3 emu g(-1)), low coercivity (H-C = 127.3 A m(-1)), high Curie temperature (T-C = 1061 K), and high electrical resistivity (rho = 244 mu omega cm), promising for soft magnets. More importantly, these prominent soft-magnetic properties are observed to be retained even after the alloy is thermally exposed at 873 K for 555 h, apparently attributable to the excellent stability of the coherent microstructure. The versatility of the magnetic properties of this new alloy is discussed in light of the microstructural change induced by tuning the chemical composition, and the enhanced performance of the alloy is compared directly with that of the traditional soft-magnetic alloys. The perspective is also addressed to design high-performance soft-magnetic alloys for high-temperature applications.