静高压下非晶(Fe0.99,Mo0.01)78Si9B13合金晶化过程的热力学研究

 在600~930 K，常压到7 GPa的范围内，对非晶(Fe_0.99,Mo_0.01)₇₈Si₉B₁₃合金等温等压退火30 min。实验表明：其晶化产物α-Fe(Mo, Si)、Fe₃B和Fe₂B相的析出与所加压力密切相关。压力使非晶(Fe_0.99,Mo_0.01)₇₈Si₉B₁₃合金的晶化温度和亚稳Fe₃B相的析出温度下降，在一定的压力和温度下，亚稳Fe₃B相将向稳定Fe₂B相转变，其转变温度随压力而变化。还对非晶(Fe_0.99,Mo_0.01)₇₈Si₉B₁₃合金的晶化和亚稳Fe₃B到稳定Fe₂B转变的热力学机制进行了讨论，并给出Fe₃B向Fe₂B的相转变方程。

A THERMODYNAMIC STUDY ON THE CRYSTALLIZATION PROCESSES OF AMORPHOUS (Fe 0.99 ,Mo 0.01 ) 78 Si 9B 13 ALLOY UNDER HIGH PRESSURE

Amorphous (Fe_0.99,Mo_0.01)₇₈Si₉B₁₃ alloys were annealed for 30 min at a temperature between 600 K and 930 K under pressures of normal pressure to 7 GPa. It was found that precipitation temperature of their crystallization products of α-Fe(Mo,Si), Fe₃B and Fe₂B alloys are related closely to the pressure used. Crystallization temperature of amorphous alloy and precipitation temperature of the metastable phase Fe₃B decrease with increasing pressure at the present pressure condition. At certain temperature and pressure, the Fe₃B alloy will transform into a stable phase Fe₂B and its transition temperature changes with pressure. A thermodynamic mechanism on the crystallization of the amorphous (Fe_0.99,Mo_0.01)₇₈Si₉B₁₃ alloy and the phase transition of the Fe₃B to the Fe₂B was discussed, and an equation of the phase transition from the Fe₃B to the Fe₂B was given.