Mn-Ga and Fe-Cr-Co have potential use as components in exchange-coupled composite magnets. Herein, we prepared Mn-Ga composites through mechanical alloying, which was followed by sintering. During high-energy ball milling, Fe-Cr-Co powder was added into the Mn-Ga powder to form a composite. The main phases in the composites existed as pure Mn and pure Ga in the as-milled state; subsequently, these phases changed into intermetallic compounds, such as Mn₃Ga and Mn_0.85Ga_0.15, after sintering at 385°C for 6 h. When the Fe-Cr-Co fraction increased from 0% to 20%, the coercivity (H_c) of the Mn-Ga/Fe-Cr-Co composites decreased monotonically from 8.04 kOe to 2.28 kOe; furthermore, their remanence (M_r) increased from 8.52 emu/g to 13.33 emu/g, and the maximum energy product (BH)_max increased from 0.15 MGOe to 0.26 MGOe. The results obtained in this study facilitate the improvement of the magnetic properties of Mn-Ga composites for utilization in permanent magnet applications.

中文翻译：

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机械合金化制备的Mn-Ga / Fe-Cr-Co磁性复合材料的组织和性能

Mn-Ga和Fe-Cr-Co有可能用作交换耦合复合磁体的成分。本文中，我们通过机械合金化制备了Mn-Ga复合材料，然后进行了烧结。在高能球磨过程中，将Fe-Cr-Co粉末添加到Mn-Ga粉末中以形成复合材料。复合材料中的主要相在研磨状态下以纯Mn和Ga存在。随后，在385°C烧结6小时后，这些相转变为金属间化合物，例如Mn ₃ Ga和Mn _0.85 Ga _0.15。当Fe-Cr-Co含量从0％增加到20％时，Mn-Ga / Fe-Cr-Co复合材料的矫顽力（H _c）从8.04 kOe单调降低到2.28 kOe；此外，他们的记忆力（M _r）从8.52 emu / g增加到13.33 emu / g，最大能量积（BH）_max从0.15 MGOe增加到0.26 MGOe。这项研究中获得的结果有助于改善Mn-Ga复合材料的磁性能，以用于永磁应用。