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The evolution of phase compositions, phase change and microstructure in Sm_2Fe_ 17 alloys during hydrogenation-disproportion process were systematically studied with XRD, SEM, EDX methods. Research indicates that HD process of Sm_2Fe_ 17 alloys is as follows: Sm_2Fe_ 17 alloy absorbs hydrogen first in the atmosphere of hydrogenation with a pressure of 01 MPa. Disproportionation begins at T≥500 ℃, then the alloys turn into lots of SmH_x and α-Fe phases which are partly in microcrystal or amorphous structures. Along with the increase of temperature, the microcrystal and amorphous structures transformed into crystal structure and this transformation thoroughly completed at 750 ℃. The size of obtained crystal grain is about 20～100 nm. Based on the experimental data, a microstructural transformation model of Sm_2Fe_ 17 alloys during hydrogenation-disproportion process was made.
The evolution of phase compositions, phase change and microstructure in Sm_2Fe_17 alloys during hydrogenation-disproportion process were systematically studied with XRD, SEM, EDX methods. Research indicates that HD process of Sm_2Fe_17 alloys is as follows: Sm_2Fe_17 alloy absorbs hydrogen first in the atmosphere of hydrogenation with a pressure of 0 1 MPa. Disproportionation begins at T ≥ 500 ℃, then the alloys turn into lots of SmH_x and α-Fe phases which are partly in microcrystal or amorphous structures. Along with the increase of temperature, the microcrystal and amorphous structures transformed into crystal structure and this transformation thoroughly completed at 750 ° C. The size of obtained crystal grains is about 20-100 nm. Based on the experimental data, a microstructural transformation model of Sm_2Fe_17 alloys during hydrogenation-disproportion process was made.