Complete suppression of metastable phase and significant enhancement of magnetic properties of B-rich PrFeB nanocomposites prepared by devitrifying amorphous ribbons

The role of nonmagnetic phases in improving the magnetic properties of devitrified Pr2Fe14B-based nanocomposites

“…[18]. The shrinkage of the crystal cell suggests that Ti replaces the Pr sites, as was also observed in [19], because the atomic radius of Ti (0.2 nm) is smaller than that of Pr (0.267 nm). From other point of view, B addition promotes the formation of TiB 2 , which decreases the amount of Ti entering the Pr 2 Fe 14 B phase.…”

Crystallization Studies of Hard Magnetic Pr9Fe56Co13Zr1Ti3B18 Alloys Ribbons of Various Thicknesses

“…It is especially difficult in case of bulk metallic glasses as well as ribbons melt spun at low speed of copper roll, where processing may lead to their partial crystallization. Appropriate admixture of elements as Y, Cr, Zr, Ti, Nb, or B may have beneficial impact on glass forming ability of the alloys and shift of the crystallization temperature towards higher values [2,3]. Additionally, the admixture of Zr or Nb restrains the grain growth during annealing and leads to formation of homogeneous microstructure [4].…”

Magnetic properties of Pr–Fe–B melt-spun ribbons with high coerecivity

“…Pr-lean PrFe-B alloys with low boron concentration (∼5-7 at%) and extremely high boron concentration (∼16-20 at%) have been adopted to develop exchange-coupled nanocomposite magnets, such as a-Fe/Pr 2 Fe 14 B or Fe 3 B/Pr 2 Fe 14 B [2]. The effect of refractory element (V, Cr, Nb, Zr, Ti) additions on the magnetic properties of exchange-spring nanocomposite magnets has been investigated [2][3][4], and indicated that Nb, Zr or Ti additions can inhibit the formation of the metastable Pr 2 Fe 23 B 3 phase, and lead to a significant improvement of the magnetic properties. However, due to the existence of the soft magnetic phases, the coercivities of the exchange-spring nanocomposite magnets are generally low (no more than 13 kOe).…”