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Metastable borides and the inducement of texture in Pr2Fe14B-type magnets produced by HDDR

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7 Author(s)
Gutfleisch, O. ; Inst. of Metallic Mater., IFW Dresden, Dresden, Germany ; Teresiak, A. ; Gebel, B. ; Muller, K.-H.
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A modified hydrogenation-disproportionation-desorption-recombination (HDDR) process has been applied to Pr2(Fe,Co,Zr)14B-type alloys. XRD and Rietveld analysis show that a Fe3B phase observed in a Pr13.7Fe80.3B6 alloy solid-disproportionated at 875°C is transformed to Fe2B and bcc Fe on further hydrogen annealing and that the formation of Fe 3B is partly suppressed when the alloy is processed at 800°C. No residual 2-14-1-type phases are observed after disproportionation of Pr13.7Fe63.5Co16.7Zr0.1B 6 alloy but here a new intermediate boride phase, Pr(Fe,Co) 12B6 (rhombohedral R¯3m), is found. Pr(Fe,Co) 12B6 transforms to (Fe,Co)2B and α-(Fe,Co) on further hydrogen annealing or conventional disproportionation. For both alloys it is found that processing at higher temperature leads to a better texture on recombination. The role of the Co and Zr additives is not primarily the stabilization of the 2-14-1 matrix phase against hydrogen disproportionation but more importantly the stabilization of intermediate boride phases

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Magnetics, IEEE Transactions on  (Volume:37 ,  Issue: 4 )