Ye Z, Meng F, Zhang F, Sun Y, Yang L, Zhou S H, Napolitano R E, Mendelev M I, Ott R T, Kramer M J, Wang C Z, Ho K M
Ames Laboratory, US Department of Energy, Ames, Iowa, 50011, USA.
Hefei National Laboratory for Physical Sciences at the Microscale and Department of Physics, University of Science and Technology of China, Hefei, Anhui, 230026, China.
Sci Rep. 2019 Apr 30;9(1):6692. doi: 10.1038/s41598-019-43079-9.
Using an effective genetic algorithm, we uncover the structure of a metastable AlSm phase that supplements its family sharing similar short-range orders. The phase evolves upon heating an amorphous Al-9.7 at.% Sm ribbon, produced by melt-spinning. The dynamical phase selection is discussed with respect to the structural connections between the short-range packing motifs in the amorphous precursor and those observed in the selected phases. The phase elucidated here is one of several newly discovered large-unit-cell phases found to form during devitrification from the glass in this binary system, further illustrating the power and efficiency of our approach, the important role of structural hierarchy in phase selection, and the richness of the metastable phase landscape accessible from the glassy structure.
通过使用一种有效的遗传算法，我们揭示了一种亚稳AlSm相的结构，该相补充了具有相似短程有序的同族相。该相是在加热通过熔体纺丝制备的非晶态Al-9.7 at.% Sm薄带时形成的。针对非晶态前驱体中的短程堆积基序与所选相中观察到的短程堆积基序之间的结构联系，讨论了动态相选择。这里阐明的相是在该二元体系中从玻璃态失透过程中发现的几个新的大晶胞相之一，进一步说明了我们方法的强大功能和效率、结构层次在相选择中的重要作用，以及从玻璃态结构可获得的亚稳相景观的丰富性。
