Nanocrystallization temperature changes of metallic glasses upon ion bombardment were investigated. For Zr₅₀Cu₃₅Al₇Pd₅Nb₃ metallic glass membranes irradiated by 1 MeV Kr ions, in situ transmission electron microscopy characterization show that nanocrystallization temperatures decrease with increasing ion fluences. The higher the ion fluence, the lower the temperature at which nanocrystals start to form. Using Monte Carlo ion transport simulations and molecular dynamics simulations, we show that upon ion bombardment, spatial distributions of positive free volume are slightly shallower than that of negative free volume. Following local recombination of the free volume of opposite signs, positive (excessive) free volume is introduced in the near surface region, and glass transition temperatures and crystallization temperatures decrease as a function of excessive free volumes.

研究了离子轰击下金属玻璃的纳米晶化温度变化。用于Zr ₅₀ Cu ₃₅ Al ₇ Pd ₅ Nb ₃1 MeV Kr离子辐照的金属玻璃膜的原位透射电子显微镜表征表明，纳米晶化温度随离子通量的增加而降低。离子通量越高，纳米晶体开始形成的温度越低。使用蒙特卡洛离子迁移模拟和分子动力学模拟，我们表明，在离子轰击下，正自由体积的空间分布略小于负自由体积的空间分布。在对相反符号的自由体积进行局部重组之后，在近表面区域引入了正的（过度的）自由体积，并且玻璃化转变温度和结晶温度根据过度的自由体积而降低。