| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Micro- and Nano-Mechanical Behavior of Materials
|
| Presentation Title |
Effects of Testing Temperature and Sample-size on Tensile Deformation of Metallic Glass |
| Author(s) |
Golden Kumar |
| On-Site Speaker (Planned) |
Golden Kumar |
| Abstract Scope |
Deformation of nanoscale metallic glasses has attracted increasing attention but remains controversial due to difficulty in fabrication and testing of small samples. Here, we report the effects of systematic variation in sample-size and testing temperature. Pt-based metallic glass samples with varying diameters (100 nm -500 m) were prepared by thermoplastic drawing. Multiple samples were deformed at different temperatures and the fracture morphologies were characterized using SEM. The results show that the fraction of vein-like morphology decreases with decreasing sample size and mirror-like fracture surface was observed in samples smaller than about 2 m in diameter. With further decreasing diameter, transition from shear-localized to necking was observed and the extent of neck increased with decreasing sample diameter. The lowering in temperature had similar effect as decrease in sample diameter. This temperature-size equivalence is discussed in terms of temperature rise and formation of liquid-like layer in shear bands. |