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STRUCTURAL STUDY OF NANOCRYSTALLINE Fe-Cu-Nb-Si-B ALLOYS BY MSSBAUER SPECTROSCOPY |
BAI Kuichang;JIANG Ziying;HE Kaiyuan;CHENG Lizhi;ZHI Jing(Northeastern University;Shenyang)(Manuscript received 7 June;1993;in revised form 9 August;1993) |
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Cite this article:
BAI Kuichang;JIANG Ziying;HE Kaiyuan;CHENG Lizhi;ZHI Jing(Northeastern University;Shenyang)(Manuscript received 7 June;1993;in revised form 9 August;1993). STRUCTURAL STUDY OF NANOCRYSTALLINE Fe-Cu-Nb-Si-B ALLOYS BY MSSBAUER SPECTROSCOPY. Acta Metall Sin, 1994, 30(14): 66-71.
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Abstract The Mssbauer spectra of some Fe_(73.5)Cu_1Nb3Si_(13.5)B_9 alloy samples as-quenched or after annealing at different temperatures have been measured at room temperature.The spectrum of as-quenched sample exhibits a typical broadened sextet as amorphous with mean internal field=17.01 MA/m.The structural relaxation or partial crystallization started after annealing at 480 to 500℃ for 0.5 h in N_2 atmosphere.General crystallization occurred remarkabley when annealed at 530℃ and above.The α-Fe(Si) nanocrystalline solid solution and residual amorphous are the two main phases after annealing at 530℃ for 1h and the relative amount of the amorphous is about 39.1%.The amount of residual amorphous phase decreases with increasing annealing temperature,down to about 25% when annealed at 620t.The internal field of the amorphous also decreases with increasing annealing temperature when general crystallization occured,however it increases a little at the structural relaxation stage.The nearest neighbour Fe atoms number distribution of Mossbauer atom in α-Fe(Si) solid solution has been calculated according to their correspondent subspectrum areas.The concentration of Si in the α-Fe(Si) phase and the ordering degree of the solid solution can also be estimated in the same way.Finally,bulk magnetic texture with different orientation has been found in the sample annealed at 550℃.
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