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Comparison of mechanical behavior between bulk and ribbon Cu-based metallic glasses |
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| Authors: | WH Jiang FX Liu YD Wang HF Zhang H Choo PK Liaw |
| Affiliation: | aDepartment of Materials Science and Engineering, The University of Tennessee, Knoxville, TN 37996, USA bSchool of Materials and Metallurgy, Northeastern University, Shenyang 110006, China cShenyang National Laboratory for Materials Science, Institute of Metals Research, Chinese Academy of Sciences, Shenyang 110016, China dMaterials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA |
| Abstract: | As-cast bulk and as-spun ribbon Cu60Zr30Ti10 metallic glasses were characterized using differential-scanning calorimetry and instrumented nanoindentation. Two alloys show a significant difference in the amount of free volume, which is attributed to the difference in a cooling rate, while exhibiting a similar serrated plastic flow. Atomic-force-microscopy observations demonstrate the pile-ups containing shear bands around the indents in both alloys. The as-cast bulk alloy has higher hardness and elastic modulus than the as-spun ribbon alloy. The difference in the strengths of two alloys may be related to the different amount of free volume. The strength seems to be more sensitive to a cooling rate during solidification than the plastic-flow behavior in the Cu60Zr30Ti10. |
| Keywords: | Metallic glasses Nanoindentation Plastic deformation Hardness Free volume |
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