In this paper, the amorphous Ce₆₈Al₁₀Cu₂₀Co₂ (atom %) alloy was in situ prepared by nanocalorimetry. The high cooling and heating rates accessible with this technique facilitate the suppression of crystallization on cooling and the identification of homogeneous nucleation. Different from the generally accepted notion that metallic glasses form just by avoiding crystallization, the role of nucleation and growth in the crystallization behavior of amorphous alloys is specified, allowing an access to the ideal metallic glass free of nuclei. Local atomic configurations are fundamentally significant to unravel the glass forming ability (GFA) and phase transitions in metallic glasses. For this reason, isothermal annealing near T_g from 0.001 s to 25,000 s following quenching becomes the strategy to tune local atomic configurations and facilitate an amorphous alloy, a mixed glassy-nanocrystalline state, and a crystalline sample successively. On the basis of the evolution of crystallization enthalpy and overall latent heat on reheating, we quantify the underlying mechanism for the isothermal nucleation and crystallization of amorphous alloys. With Johnson–Mehl–Avrami method, it is demonstrated that the coexistence of homogeneous and heterogeneous nucleation contributes to the isothermal crystallization of glass. Heterogeneous rather than homogeneous nucleation dominates the isothermal crystallization of the undercooled liquid. For the mixed glassy-nanocrystalline structure, an extraordinary kinetic stability of the residual glass is validated, which is ascribed to the denser packed interface between amorphous phase and ordered nanocrystals. Tailoring the amorphous structure by nanocalorimetry permits new insights into unraveling GFA and the mechanism that correlates local atomic configurations and phase transitions in metallic glasses.

中文翻译：

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纳米量热法在玻璃形成金属中击败均相成核并调整原子序。

本文采用纳米量热法原位制备了非晶态的Ce ₆₈ Al ₁₀ Cu ₂₀ Co ₂（原子％）合金。用该技术可获得的高冷却和加热速率有利于抑制冷却时的结晶并鉴定均相成核。与通常被认为仅通过避免结晶而形成金属玻璃的观点不同，规定了成核作用和非晶态合金的结晶行为中的生长作用，从而允许获得不含核的理想金属玻璃。本地原子构型对于弄清金属玻璃的玻璃形成能力（GFA）和相变至关重要。因此，等温退火接近Ť _{g ^}淬火后从0.001 s到25,000 s的转变成为调整局部原子构型并依次促进非晶态合金，混合玻璃态-纳米晶态和晶体样品的策略。基于再加热时结晶焓和总潜热的演变，我们量化了非晶合金等温成核和结晶的潜在机理。用Johnson-Mehl-Avrami方法，证明了均相和异相成核的共存有助于玻璃的等温结晶。非均相而不是均相的成核作用主导了过冷液体的等温结晶。对于混合的玻璃-纳米晶体结构，残余玻璃具有非凡的动力学稳定性，这归因于非晶相和有序纳米晶体之间的密集堆积界面。通过纳米量热法定制非晶态结构，可以使人们深入了解GFA的分解以及与金属玻璃中的局部原子构型和相变相关的机理。