Elastic and viscoelastic properties of glassy, quasicrystalline and crystalline phases in Zr65Cu5Ni10Al7.5Pd12.5 alloys

✍ Scribed by Jean-Marc Pelletier; Dmitri V. Louzguine-Luzgin; Song Li; Akihisa Inoue

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 830 KB
• Volume: 59
• Category: Article
• ISSN: 1359-6454
• DOI: 10.1016/j.actamat.2011.01.018

✦ Synopsis

The elastic and viscoelastic properties of Zr 65 Ni 10 Cu 5 Al 7.5 Pd 12.5 bulk metallic glass have been studied over a wide temperature and frequency range. In the amorphous state the mechanical response of the alloy is simple, similar to that observed in other bulk metallic glasses. In contrast, the phase-transformation process which occurs during annealing at elevated temperature induces a complex evolution. This alloy transforms to a supercooled liquid and then primarily forms an icosahedral phase followed by the formation of a mixture of crystalline phases. The mechanical properties in the amorphous state are well described using a physical model based on the concept of defects in amorphous materials. Atomic mobility is then governed by two parameters: activation energy U el (0.92 eV) and correlation factor v (0.39). The influence of the phase composition on the properties is discussed.