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The Anomalous Nucleation in Al-Tb Metallic Glasses
Metallurgical and Materials Transactions A ( IF 2.8 ) Pub Date : 2021-01-02 , DOI: 10.1007/s11661-020-06111-6
T. H. Ulucan , I. Kalay , Y. E. Kalay

The effects of amorphous structure on the devitrification of Al90Tb10 marginal glass former system were investigated in detail by a combined study of high-energy X-ray diffraction (HEXRD), X-ray absorption fine structure (EXAFS), reverse Monte Carlo simulations (RMC), transmission electron microscopy (TEM) and thermal analyses. The atomic structures of melt-spun ribbons and magnetron sputtered amorphous samples with the same composition were simulated using RMC constrained by XRD, EXAFS, and ab-initio results. The fcc-Al nanocrystals nucleated and grown in thin-film specimens have a limited size with almost perfect spherical morphology. The population of these nanocrystals is three orders of magnitude higher as compared to ribbon specimens. The differences in the devitrified ribbon and thin-film metallic glasses were traced back to structural differences in the amorphous state. The amorphous melt-spun ribbons and magnetron sputtered thin- films were found to have different degrees of short-range order and clustering.



中文翻译:

Al-Tb金属玻璃的异常成核

非晶结构对Al 90 Tb 10失透的影响通过对高能X射线衍射(HEXRD),X射线吸收精细结构(EXAFS),反向蒙特卡洛模拟(RMC),透射电子显微镜(TEM)和热学的综合研究来详细研究边缘玻璃形成系统分析。使用受XRD,EXAFS和从头算结果约束的RMC,模拟了具有相同组成的熔纺带和磁控溅射非晶态样品的原子结构。在薄膜样品中成核并生长的fcc-Al纳米晶体的尺寸有限,几乎具有完美的球形形态。与带状样品相比,这些纳米晶体的数量高出三个数量级。失透玻璃带和薄膜金属玻璃的差异可追溯到非晶态的结构差异。

更新日期:2021-01-03
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