Quasi-static and dynamic deformation behaviour of Zr-based bulk metallic glass

International Symposium on Dynamic Deformation and Fracture of Advanced Materials 2013

物理学;材料科学

Nekouie, V.^1 ; Kühn, U.^2 ; Roy, A.^1 ; Silberschmidt, V.^1

Wolfson School of Mechanical and Manufacturing Engineering, Loughborough University, Leicestershire, United Kingdom^1

IFW Dresden, Institute for Complex Materials, Helmholtzstraße 20, D-01069 Dresden, Germany^2

关键词: Dynamic deformation;    Dynamic mechanical analyzer;    Dynamic mechanical relaxation;    Elastic-perfectly plastic material;    Nanoindentation tests;    Softening phenomenon;    Spherical indenters;    Zr based bulk metallic glass;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/451/1/012009/pdf
DOI  :  10.1088/1742-6596/451/1/012009

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Nano- and micro-indentation studies were carried out to characterise a plasticity mechanism through the evolution of localised shear bands that drive material's deformation at sub-micron length scale. Initial deformation of Zr-based bulk metallic glass (BMG) was investigated with nanoindentation tests using a spherical indenter. The indentation cycle reflects an elastic deformation with the yielding load of approx. 3 mN. For designed cycling indentation, hardening and softening phenomena were observed in nano- and micro-indentations, respectively. High-precision dynamic mechanical relaxation measurements were performed using a Dynamic Mechanical Analyzer (DMA), on decreasing frequency from 160 Hz to 0.1 Hz. A mechanical response of the BMG surface to a concentrated impact load was also studied. The obtained results indicated that the studied Zr-based BMG behaved as an elastic-perfectly plastic material at macroscale with discrete plasticity events at smaller length scales.