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The study of loading rate effect of a Cu-based bulk metallic glass during nanoindentation

Authors
Journal
Journal of Alloys and Compounds
0925-8388
Publisher
Elsevier
Publication Date
Volume
504
Identifiers
DOI: 10.1016/j.jallcom.2010.03.207
Keywords
  • Metals
  • Amorphous Materials
  • Scanning And Transmission Electron Microscopy
Disciplines
  • Mathematics

Abstract

Abstract In this study, the nanoindentation behavior of a Cu–Zr–Al–Ag bulk metallic glass was investigated at various loading rates. It is found that the load–displacement curve of indentation exhibits a significant serration of displacement jumps (pop-ins). The experiment data show that the depths of the pop-in site are a geometric series. The size of pop-ins increases with indentation depth but decreases with loading rate; a larger applied loading rate leads to smaller pop-ins during the indentation process. However, the experimental results indicate that the loading rate has no influence on the depth ratio of pop-in sites. FIB observation and TEM diffraction patterns show that the microstructure of the BMG material remained amorphous irrespective of the presence shear bands.

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