A Novel Soft‐Magnetic B2‐Based Multiprincipal‐Element Alloy with a Uniform Distribution of Coherent Body‐Centered‐Cubic Nanoprecipitates

• DOI: 10.1002/adma.202006723
• Publication Date: 2021-03-03T11:55:26Z
• Authors: Yue Ma; Qing Wang; Xuyang Zhou; Jiamiao Hao; Baptiste Gault; Qingyu Zhang; Chuang Dong; T. G. Nieh
• Keywords: High-Entropy Alloys

Abstract Multiprincipal‐element alloys (MPEAs), including high‐entropy alloys, are a new class of materials whose thermodynamical properties mainly driven by configuration entropy, rather than enthalpy in the traditional especially at high temperatures. Herein, design novel soft‐magnetic nonequiatomic, quaternary MPEA is described, via tuning its chemical composition to deliberately manipulate microstructure, such that it contains ultrafine ferromagnetic body‐centered‐cubic (BCC) coherent nanoprecipitates (3–7 nm) uniformly distributed B2‐phase matrix. The alloy Al 1.5 Co 4 Fe 2 Cr exhibits saturation magnetization ( M S = 135.3 emu g ‐1 ), low coercivity H C 127.3 A m Curie temperature T 1061 K), and electrical resistivity (ρ 244 μΩ cm), promising for soft magnets. More importantly, these prominent observed be retained even after thermally exposed 873 K 555 h, apparently attributable excellent stability microstructure. versatility magnetic this discussed light microstructural change induced composition, enhanced performance compared directly with alloys. perspective also addressed high‐performance high‐temperature applications.