Abstract The effect of Sm micro-alloying on non-isothermal and isothermal crystallization kinetics of (Zr50Cu40Al10)100-xSmx (x = 0, 2, 4 at. % Sm) alloys were investigated using differential scanning calorimetry (DSC), transmission electron microscopy (TEM), and X-ray diffraction (XRD). Crystallization activation energies for each composition were calculated in non-isothermal conditions using Kissinger and Ozawa methods and in isothermal conditions using Johnson-Mehl-Avrami model. XRD analysis showed that crystallization product Cu10Zr7 changes to Cu2Sm with Sm presence in isothermal conditions. Both isothermal and isochronal calculations yield that the energy barrier for crystallization has increased with Sm addition. On the other hand, crystallization point drops to lower temperature at the expense of an increase in the pre-exponential factor. The Avrami exponents for all compositions were found to be below 2.5, indicating that crystallization was governed by a diffusion-controlled three-dimensional growth with a decreasing nucleation rate. The apparent increase in crystallization activation energies with increasing Sm content can be one of the affecting factors for commonly held idea of increased glass forming ability for rare-earth containing Zr-based metallic glasses.

中文翻译：

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Sm对Cu-Zr-Al金属玻璃结晶动力学的影响

摘要 使用差示扫描量热法 (DSC)、透射电子显微镜研究了 Sm 微合金化对 (Zr50Cu40Al10)100-xSmx (x = 0, 2, 4 at. % Sm) 合金非等温和等温结晶动力学的影响(TEM) 和 X 射线衍射 (XRD)。使用 Kissinger 和 Ozawa 方法在非等温条件下以及使用 Johnson-Mehl-Avrami 模型在等温条件下计算每种组合物的结晶活化能。XRD 分析表明，在等温条件下，随着 Sm 的存在，结晶产物 Cu10Zr7 变为 Cu2Sm。等温和等时计算均表明结晶的能垒随着 Sm 的添加而增加。另一方面，结晶点下降到较低的温度，代价是指数前因子的增加。发现所有组合物的 Avrami 指数都低于 2.5，表明结晶受扩散控制的三维生长控制，成核率降低。随着 Sm 含量的增加，结晶活化能的明显增加可能是影响含稀土 Zr 基金属玻璃的玻璃形成能力增加的普遍观点的影响因素之一。