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The phase constitution and variation of Nd_(14)Fe_(73)Co_6B_7 alloy after hydriding and subsequentdehydriding treatment at 770℃ have been investigated respectively by means of X-raydiffraction,SEM,TEM and magnetic measurement techniques.The original coarse,as castgrain structure,is dissolved into α-Fe,Nd hydride and Fe_2B mixture with average dimensionof 0.1 μm,during hydriding process,and subsequently the triphase mixture recombined intofinely unique Nd_2Fe_(14)B phase with dimension of 0.3 μm by desorbing the hydrogen.It wasfound that the Nd-rich phase distributed at the boundary of as-cast grain structure diffusedinto matrix Nd_2Fe_(14)B grain during hydriding.It remains during dehydriding and distributehomogeneously around some colonies composed of fine grains of Nd_2Fe_(14)B.
The phase constitution and variation of Nd_ (14) Fe_ (73) Co_6B_7 alloy after hydriding and subsequent dehydriding treatment at 770 ℃ have been investigated individually by means of X-raydiffraction, SEM, TEM and magnetic measurement techniques. The original coarse, as castgrain structure , is dissolved into α-Fe, Nd hydride and Fe_2B mixture with average dimension of 0.1 μm, during hydriding process, and the triphase mixture recombined intofinely unique Nd_2Fe_ (14) B phase with dimension of 0.3 μm by desorbing the hydrogen. the Nd-rich phase distributed at the boundary of as-cast grain structure diffusedinto matrix Nd_2Fe_ (14) B grain during hydriding.It remains during dehydriding and distributehomogeneously around some colonies composed of fine grains of Nd_2Fe_ (14) B.