We used molecular dynamics simulations to investigate the dependence of the atomic-scale structure on the temperature and pressure conditions of Al₇₀Ni₁₅Co₁₅ metallic glass. The effect of pressure variations on the glass transition temperature was also studied, showing an increase with pressure. Moreover, radial distribution function, coordination number, and Voronoi tessellation analysis indicate that the applied pressure affects the local structure of glassy Al₇₀Ni₁₅Co₁₅. We used a local symmetry parameter to access the glass-forming ability of the metallic glasses cooled under different pressures. The glasses cooled under high-pressures showed a significant fraction of embedded crystalline structure, which was found to be surrounded by a region of mixed-like clusters playing the role of an interface between the crystalline region and the glassy region. The correlation length, as calculated from the full width at half maximum of the first sharp diffraction peak, indicated an increase of the medium-range order with the increase of pressure. The evolution of the heterogeneity with pressure was highlighted by the existence of nanoscale crystals (1 to 4 nm in size)embedded in the amorphous zone. Finally, we discuss the results by referring to the atomic potential energy and stress.

我们使用分子动力学模拟研究了原子尺度结构对Al ₇₀ Ni ₁₅ Co ₁₅金属玻璃的温度和压力条件的依赖性。还研究了压力变化对玻璃化转变温度的影响，显示出随着压力的增加。此外，径向分布函数，配位数和Voronoi镶嵌分析表明，施加的压力会影响玻璃态Al ₇₀ Ni ₁₅ Co ₁₅的局部结构。。我们使用局部对称性参数来访问在不同压力下冷却的金属玻璃的玻璃形成能力。在高压下冷却的玻璃显示出很大一部分嵌入的晶体结构，发现该结构被混合状簇簇的区域包围，这些簇状簇起着晶体区域和玻璃态区域之间的界面的作用。由第一尖锐衍射峰的半峰全宽计算出的相关长度表明，随着压力的增加，中程级增加。埋在非晶区中的纳米级晶体（尺寸为1-4 nm）突出了压力下异质性的演变。最后，我们通过参考原子势能和应力来讨论结果。