Xia Zhuoran, Huang Xiangyi, Liu Jiaqi, Dai Wen, Luo Liuxiong, Jiang Zhaohan, Gong Shen, Zhao Yuyuan, Li Zhou
School of Materials Science & Engineering, Central South University, Changsha, 410083, China.
State Key Laboratory of Powder Metallurgy, Changsha, 410083, China.
Nat Commun. 2024 Dec 3;15(1):10494. doi: 10.1038/s41467-024-54904-9.
Structural electromagnetic shielding materials are required to withstand high stress and electromagnetic interference in extreme environments. In this paper, a nano-magnetic Heusler phase with desired structure parameters was successfully obtained in a copper matrix by employing a multi-objective driving design strategy. The resulting copper alloy exhibits a yield strength of up to 1.5 GPa, and the attenuation degree of electromagnetic wave reaches 99.999999999% (110 dB) within the frequency range of 10 kHz to 3 GHz. The research suggests that the NiMnSn precipitates with optimized structure parameters (including high number density: 5 × 10m, small size: 23 nm, large aspect ratio: 4, low mismatch: 2.3%, strong bonding: -0.316 eV/atom, magnetic order: 4.05 μ/f.u.) both reinforce the matrix by strong pinning and enhance electromagnetic shielding properties through magnetic-electric coupling. This design method tailored for multiple performance requirements provides a valuable tool for the development of structure-function integrated materials.
结构电磁屏蔽材料需要在极端环境中承受高应力和电磁干扰。本文通过采用多目标驱动设计策略，在铜基体中成功获得了具有理想结构参数的纳米磁性赫斯勒相。所得铜合金的屈服强度高达1.5吉帕，在10千赫至3吉赫的频率范围内，电磁波的衰减程度达到99.999999999%（110分贝）。研究表明，具有优化结构参数（包括高数量密度：5×10m、小尺寸：23纳米、大纵横比：4、低失配：2.3%、强键合：-0.316电子伏特/原子、磁有序：4.05微/晶胞）的NiMnSn析出相通过强钉扎作用增强基体，并通过磁电耦合提高电磁屏蔽性能。这种针对多种性能要求量身定制的设计方法为结构功能一体化材料的开发提供了有价值的工具。
