Abstract
In the glassy temperature region from ambient to the glass transition temperature (Tg), an apparent Young's modulus (Eap), the slope of the initial linear part on the stress-strain curve, in a Zr-based metallic glass clearly depends on both temperature and strain rate, especially above 0.87 Tg. This indicates that viscous contribution is included in this apparent elastic response. If yield strain is deduced with Young's modulus measured by the ultrasonic vibration method, which excludes the viscous contribution, temperature dependence of the yield strain can be captured well with the Argon's Shear Transformation Zone (STZ) model. On the other hand if the yield strain is deduced with Eap, the strain was found to keep the "universal" critical value ∼ 0.020 for many metallic glasses at the ambient temperature. This may indicate another clue to understand the yield mechanism on BMG.
Original language | English |
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Pages (from-to) | 1592-1594 |
Number of pages | 3 |
Journal | Materials Letters |
Volume | 62 |
Issue number | 10-11 |
DOIs | |
Publication status | Published - 2008 Apr 15 |
Keywords
- Mechanical properties
- Metallic glass
- Viscoelasticity
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering