Deformation behavior of Fe-based bulk metallic glass during nanoindentation

• Published in: Science China. Physics, mechanics & astronomy Vol. 51; no. 4; pp. 365 - 371
• Main Authors: Li, Lei, Liu, Yuan, Zhang, TaiHua, Gu, JianSheng, Wei, BingChen
• Format: Journal Article
• Language: English
• Published: Heidelberg SP Science in China Press 01.04.2008; Springer Nature B.V
• Subjects: Ambient temperature; Amorphous materials; Astronomy; Classical and Continuum Physics; Compression tests; Crystallization; Deformation; Iron; Load distribution; Loading rate; Mechanical properties; Metallic glasses; Nanoindentation; Observations and Techniques; Physics; Physics and Astronomy; Plastic deformation; Plastics; bulk metallic glass; nanoindentation; shear band; serrated flow
• ISSN: 1672-1799; 1674-7348; 1862-2844; 1869-1927
• DOI: 10.1007/s11433-008-0042-5

s Fe-based bulk metallic glasses (BMGs) normally exhibit super high strength but significant brittleness at ambient temperature. Therefore, it is difficult to investigate the plastic deformation behavior and mechanism in these alloys through conventional tensile and compressive tests due to lack of distinct macroscopic plastic strain. In this work, the deformation behavior of Fe 52 Cr 15 Mo 9 Er 3 C 15 B 6 BMG was investigated through instrumented nanoindentation and uniaxial compressive tests. The results show that serrated flow, the typical plastic deformation feature of BMGs, could not be found in as-cast and partially crystallized samples during nanoindentation. In addition, the deformation behavior and mechanical properties of the alloy are insensitive to the applied loading rate. The mechanism for the appearance of the peculiar deformation behavior in the Fe-based BMG is discussed in terms of the temporal and spatial characteristics of shear banding during nanoindentation.