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首页> 外文期刊>Philosophical Magazine Letters >Nanocrystallization in a Zr_(57)Ti_5Cu_(20)Al_(10)Ni_8 bulk metallic glass
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Nanocrystallization in a Zr_(57)Ti_5Cu_(20)Al_(10)Ni_8 bulk metallic glass

机译：Zr_（57）Ti_5Cu_（20）Al_（10）Ni_8大块金属玻璃中的纳米晶化

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The first stages of thermal relaxation towards equilibrium in a Zr_(57)Ti_5Cu_(20)Al_(10)Ni_8 bulk metallic glass have been studied by differential scanning calorimetry, X-ray diffraction, transmission electron microscopy and high-resolution electron microscopy. These coupled experiments rule out for this glass the existence of a phase separation on the nanometric scale preceding the onset of crystallization. The first step of crystallization is of the primary type, that is it consists of the nucleation of nanocrystallites in the amorphous matrix with which they coexist in metastable equilibrium. The very high nucleation rate leads to a nanometric composite structure with a number density of about 7 * 10~(24) m~(-3) of 3-4 nm crystallites, occupying a volume fraction of about 15%. These features, as well as the crystallization kinetics observed during isochronal or isothermal heating, are discussed.
机译：通过差示扫描量热法，X射线衍射，透射电子显微镜和高分辨率电子显微镜研究了Zr_（57）Ti_5Cu_（20）Al_（10）Ni_8大块金属玻璃中趋于平衡的热弛豫的第一阶段。这些耦合的实验排除了这种玻璃在结晶开始之前存在纳米级相分离的可能性。结晶的第一步是主要类型，即由非晶态基质中的纳米微晶核形成，它们与之共存于亚稳态。非常高的成核速率导致纳米复合结构具有约7 * 10〜（24）m〜（-3）的3-4 nm微晶，其体积分数约为15％。讨论了这些特征以及在等时或等温加热过程中观察到的结晶动力学。

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