Role of tensile elastostatic loading on atomic structure and mechanical properties of Zr55Cu30Ni5Al10 bulk metallic glass
| Autor: | Shamsoddin Mirdamadi, Ahmad Ali Amadeh, Reza Gholamipour, Majid Samavatian |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Low stress Work (thermodynamics) Materials science Amorphous metal Mechanical Engineering 02 engineering and technology Plasticity 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Stress (mechanics) Mechanics of Materials Homogeneous 0103 physical sciences Ultimate tensile strength Compression test General Materials Science Composite material 0210 nano-technology |
| Zdroj: | Materials Science and Engineering: A. 753:218-223 |
| ISSN: | 0921-5093 |
| DOI: | 10.1016/j.msea.2019.03.058 |
| Popis: | In this work, the pre-tensile elastostatic loading with low stress values (5%–20% σy) was used to rejuvenate Zr55Cu30Ni5Al10 bulk metallic glass (BMG). The atomic pair density function analysis shows that the rejuvenation evolution is accompanied with a significant disordering of short and medium atomic scales in the BMG structure. The results also indicate that the decreasing rate of annihilation in Cu Zr pairs under rejuvenation is higher than Zr Zr and Zr Al pairs. In general, it is suggested that the interaction of stress domains under elastostatic loading is the main reason for disordering during the rejuvenation evolution. The compression test reveals that a brittle-to-ductile transition is happened from as-cast sample to the rejuvenated ones. Moreover, it is found that the serrations in the plastic region of stress-strain curves of highly-rejuvenated samples show a self-organized critical state. As a whole, with increase in pre-tensile elastostatic loading value, the structural rejuvenation enhances and the homogeneous plasticity improves. |
| Databáze: | OpenAIRE |
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