Abstract
We have investigated the effect of P and Zr on the magnetic properties and microstructure of the as-spun ribbon Pr2Fe14B/α-Fe achieved at a wheel speed of 30 m/s. X-ray diffraction and TEM results reveal that P-addition can decrease the grain size of 2:14:1 hard phase whereas further Zr-addition decreases the soft α-Fe phase. The combination of doping P and Zr reduces overall grain size and refines the microstructure considerably, and results in enhanced coercivity significantly. The strong exchange coupling interaction in our ribbons were confirmed by Henkel plots, which leads to higher coercivity of 964 kA/m. The initial magnetization curves reveal the coercivity in P-added alloy is controlled by the nucleation of reversal domain and that in further Zr-added alloy is the domain wall pinning.
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