Influence of Zr element on the atomic structure of Al-Cu alloy liquid
Abstract
The correlation between structure and glass-forming ability in multicomponent alloys is a long-standing puzzle due to the complexity of compositions. In this work, Al 77.8 Cu 22.2 and Al 70 Cu 20 Zr 10 amorphous alloy liquids were investigated by combining high-energy X-ray diffraction at a synchrotron facility, ab-initio molecular dynamics and reverse Monte Carlo simulations. The short-and medium-range order structures of two alloy liquids were analyzed and compared. The results suggest that the glassforming ability of Al-Cu-Zr alloy liquid is not related to the content of icosahedral short-range order, but to the diversity of cluster types and the uniformity of cluster content distribution, and the structural heterogeneity and correlation of clusters with high five-fold symmetry. These findings reveal the role of Zr element in enhancing the glass-forming ability of Al-Cu alloy liquid, and deepen the understanding of Albased metallic glasses formation.
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