Ultrasonic properties of Cu45Zr(45-x)HfxAg10glassy alloys

✍ Scribed by Fukuhara, Mikio ;Jia, Fei ;Zhang, Wei ;Inoue, Akihisa

• Book ID: 105363846
• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 168 KB
• Volume: 203
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200622217

✦ Synopsis

Abstract

Using ultrasonics, the acoustic characteristics of Cu~45~Zr~(45–x)~Hf~x~ Ag~10~ (x = 0–25) glassy alloys were examined in terms of complex elasticity. The values of bulk modulus (K), Lamè parameter (λ), Young's (E) and shear (G) moduli of Cu~45~Zr~(45–x)~Hf~x~ Ag~10~ glassy alloys are found to have a unique order for metallic materials, except for polymers. The large Poisson ratio (∼0.421) and the lower G /K ratio (∼0.167) at 25 at% Hf indicate rubbery characteristics that readily undergo uniaxial volume‐preserving deformation but resist three‐dimensional nonvolume‐preserving deformation. The complex dynamic viscosity shows that visco‐elasticity of the glassy alloys is dominated by shear motion. The large peaks in K and λ, and small ones in E and G at 5 at% Hf, and one large peak in the shear attenuation coefficient at 2.5 at% Hf, may indicate atomic morphological change by electron‐transverse phonon coupling. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)