Strain, Stress and Stress Relaxation in Oxidized Zrcual-Based Bulk Metallic Glass
| Autor: | Mitchell Nancarrow, Saber Haratian, Thomas Lundin Christiansen, Matteo Villa, Flemming Bjerg Grumsen, Frank Niessen, Marcel A. J. Somers, Elena V. Pereloma |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Polymers and Plastics Residual stress 02 engineering and technology Surface engineering 01 natural sciences Focused ion beam FIB-DIC method 0103 physical sciences Stress relaxation ZrCuAl-based bulk metallic glass Composite material Internal oxidation 010302 applied physics Amorphous metal Stress–strain curve Metals and Alloys 021001 nanoscience & nanotechnology Gaseous Oxidizing Electronic Optical and Magnetic Materials Compressive strength Ceramics and Composites Relaxation (physics) 0210 nano-technology Self-healing mechanism X-ray diffraction sin 2 ψ method |
| Zdroj: | Haratian, S, Nießen, F, Grumsen, F B, Nancarrow, M J B, Pereloma, E V, Villa, M, Christiansen, T L & Somers, M A J 2020, ' Strain, stress and stress relaxation in oxidized ZrCuAl-based bulk metallic glass ', Acta Materialia, vol. 200, pp. 674-685 . https://doi.org/10.1016/j.actamat.2020.09.049 |
| ISSN: | 1556-5068 |
| Popis: | Surface engineering of Zr 51.3 Al 8.5 Cu 31.3 Ni 4 Ti 4.9 bulk metallic glass (BMG) by gaseous oxidizing below the glass-transition temperature is investigated as a means to introduce compressive residual stress in the surface region. The ZrCuAl-based BMG was exposed to an extremely low oxygen partial pressure of 10−41 bar at 600 K for 60 h. The oxidizing treatment led to the formation of an internal oxidation zone, consisting of finely dispersed nano-crystalline cubic ZrO 2 (c-ZrO2 ), metallic regions inclined with the surface and Cu-hillocks at the surface. The stresses introduced by the volume expansion associated with oxidation were evaluated from i) the lattice strains within c-ZrO2 , as determined with an X-ray diffraction (XRD) based method, and ii) strain-relaxation as a response to annular focused ion beam (FIB) milling, as monitored with digital image correlation (DIC). XRD analysis yielded -1.5 GPa (compressive stress) in the nano-crystalline c-ZrO2 , while the strain relaxation monitored with FIB-DIC analysis indicated compressive residual stresses of −1.4 GPa in the internal oxidation zone. The strains and stresses determined with the independent measurement methods are discussed. The quantitative macro-strains are discussed in relation to the microstructural features and stress relaxation mechanisms during evolution of the internal oxidation zone. |
| Databáze: | OpenAIRE |
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