Abstract
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 Mn0.85Ga0.15, after sintering at 385°C for 6 h. When the Fe-Cr-Co fraction increased from 0% to 20%, the coercivity (Hc) of the Mn-Ga/Fe-Cr-Co composites decreased monotonically from 8.04 kOe to 2.28 kOe; furthermore, their remanence (Mr) 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.
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