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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Combined in-situ SAXS/WAXS and HRTEM study on crystallization of (Cu _(60)Co_(40))_(1-x)Zr_x metallic glasses
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Combined in-situ SAXS/WAXS and HRTEM study on crystallization of (Cu _(60)Co_(40))_(1-x)Zr_x metallic glasses

机译：原位SAXS / WAXS和HRTEM结合研究（Cu _（60）Co_（40））_（1-x）Zr_x金属玻璃的结晶

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摘要

CuZr as well as CoZr are well known metallic glass-formers in a wide compositional range. Since the binary Cu-Co system exhibits a metastable liquid-liquid miscibility gap, i.e. Cu and Co tend to separate from each other, the ternary Cu-Co-Zr system is a promising candidate to form phase separated glass-glass composites. In this work (Cu_(60)Co_(40)) _(1 - x)Zr_x metallic glasses with relatively low Zr contents of x = 37 and x = 32 were prepared by melt spinning and investigated by in-situ small-angle and wide-angle X-ray scattering (SAXS/WAXS) and differential scanning calorimetry (DSC). Certain heat treated samples were additionally investigated by high-resolution transmission electron microscopy (HRTEM). Even for x = 32 there are no indications for any kind of phase separation in the as-quenched state within experimental resolution, i.e. the critical temperature T_c for a liquid-liquid phase separation has already decreased from 1556 K for binary Cu_(60)Co_(40) to a temperature below the glass transition temperature T_g = 762(5)K found for (Cu _(60)Co_(40))_(68)Zr_(32). Combined in-situ SAXS/WAXS and HRTEM investigations reveal that thermal annealing also does not induce an amorphous-amorphous phase separation. Instead the formation of nano crystallites of a so far unknown Cu-rich/Zr-poor phase with relatively low activation energy for crystallization E_a = 116(7) kJ/mol at temperatures far below the crystallization temperature deduced from DSC measurements is observed.
机译：CuZr和CoZr是广泛成分范围内的众所周知的金属玻璃形成剂。由于二元Cu-Co系统显示出亚稳态的液-液混溶性间隙，即Cu和Co趋于彼此分离，因此三元Cu-Co-Zr系统是形成相分离玻璃-玻璃复合材料的有希望的候选者。在这项工作中，通过熔融纺丝制备Zr含量相对较低的x（Cu_（60）Co_（40）__（1-x）Zr_x金属玻璃= 37和x = 32，并通过原位小角度研究广角X射线散射（SAXS / WAXS）和差示扫描量热法（DSC）。某些热处理过的样品还通过高分辨率透射电子显微镜（HRTEM）进行了研究。即使对于x = 32，也没有迹象表明在实验分辨率之内处于淬灭状态的任何形式的相分离，即，液-液相分离的临界温度T_c已从二元Cu_（60）Co_的1556 K降低（40）到低于（Cu _（60）Co_（40））_（68）Zr_（32）的玻璃化转变温度T_g = 762（5）K的温度。结合的原位SAXS / WAXS和HRTEM研究表明，热退火也不会引起非晶-非晶相分离。取而代之的是，在远低于由DSC测量得出的结晶温度的温度下，观察到形成了迄今未知的富Cu /贫Zr相的纳米微晶，具有相对较低的结晶活化能E_a = 116（7）kJ / mol。

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