【摘要】 用X射线衍射法研究了(Fe_0.1Co_0.55Ni_0.35)₇8Si₈B₁₄金属玻璃在常压下及20kbar高压下晶化过程中的析出相及析出过程。结果表明在上述压力下晶化过程都分成两个阶段,分别对应于初级晶化和共晶晶化。在常压下,初级晶化时析出fcc-Co晶体,而共晶晶化对应着Ni₃₁Si₁₂和（FeCoNi）₃（SiB）相的析出。随着回火温度的增高或时间的延长,（FeCoNi）₃（SiB）相逐渐转变为（FeCoNi）₂₃B₆相。20kbar高压下的晶化析出过程与常压下不同的是:提高了晶化温度,在共晶晶化阶段出现了Co₂B相。此外,压力还阻止（FeCoNi）₂₃B₆相的形成。从热力学和动力学的角度讨论了压力对金属玻璃晶化过程的影响。更多还原

【Abstract】 The crystallization process, precipitation sequence and structure of precipitated phases during heating metglass (Fe0.1Co0.55Ni0.35)78Si8B14 at normal and 20 kbar high pressures were examined by means of X-ray diffraction method. It was determined that both at normal and 20 kbar high pressures the crystallization will proceed in two stages corresponding to the primary and eutectic crystallization respectively. At normal pressure, fee-Co was observed on primary crystallization, while NiSiSi12 and (FeCoNi)3(SiB) compounds appeared in eutectic transition. With increasing temperature or prolonging of tempering, the (FeCoNi)s(SiB) compound transforms into the (FeCoNi)23B6 phase gradually. On the other hand, on heating the metglass at 20 kbar, in addition to the increasing in crystallization temperature, another compound Co2B appears. Besides, it has been found that high pressure will restrain the formation of (FeCoNi)23B6 phase.The influence of high pressure on the crystallization of metglass is discussed from point of view of thermodynamics and kinetics.更多还原