静高压下有表面化学反应的非晶合金晶化研究

STUDY ON THE CRYSTALLIZATION OF AMORPHOUS ALLOY WITH CHEMICAL REACTION AT ITS SURFACE UNDER HIGH PRESSURE

在静高压3—5GPa,510—660℃温度下,研究了在晶化过程中其表面与Al发生反应的非晶(Fe_(0.99),Mo_(0.01))_(78)Si_9B_(13)合金的晶化过程。发现在4GPa左右,510—660℃的温度范围内,非晶FMSB晶化为纳米α_Fe(Al)相,在其他压力下,晶化为α_Fe(Mo,Si),(Fe,Mo)_3B或Fe_2B相。利用简单固体模型对其晶化的热力学机制进行了探讨。

Study on the crystallization process of amorphous (Fe0.99, Mo0.01 )78Si9B13(FMSB) alloy with and without solid state reaction at their surfaces were carried out under pressures from 3 to 5 GPa at a temperature range of 510 to 660℃ . When the amorphous FMSB alloy with the reaction was annealed at the temperature range, it is transformed into nanocrystalline α - Fe( Al) at 4 GPa and α - Fe (Mo, Si), (Fe, Mo)3B or Fe2B at other pressures, which were as same as the crystallization products of the amorphous alloy without the reaction at the same pressures. The crystallization mechanism of the amorphous alloy with the reaction was suggested on the basis of therrnodynamic theory and a simple solid model.