Abstract
Effects of a TiC addition on microstructure and magnetic properties in [MRE2.2Fe14B](100−2x)∕17.2+TixCx(MRE=Nd+Y+Dy,x=1–5) ribbons, melt spun at a wheel speed of 16m∕s, were systematically studied. X-ray diffraction and differential thermal analysis data revealed that the addition of TiC improves the glass formability in the mixed rare earth alloys without Co, resulting in partially amorphous alloys. TEM observations showed that the average grain size in the as spun samples decreases from 200 to 20 nm with increasing x from 1 to 5, confirming that the addition of TiC can significantly improve microstructure. For an optimized [MRE2(Fe,Co)14B](100−2x)∕17.2+TixCx sample with x=2, spun at 25m∕s and annealed at 750 °C for 15 min, the room-temperature magnetic properties of Hcj=11.8kOe, Mr=7.2kGs, and (BH)max=11.3MGOe were obtained. Temperature coefficients for Mr and Hcj of −0.06 and −0.37%∕°C, respectively, also were measured in the temperature range of 27–100 °C. The new magnet alloy exhibits more uniform magnetic properties and a usable energy product to nearly 300 °C.
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