Dynamic and quasi-static mechanical properties of fibre-reinforced metallic glass at different temperatures |
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| Authors: | B. Hou L.-Q. Xing C.-S. Chen H.-C. Kou J.-S. Li |
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| Affiliation: | 1. School of Aeronautics , Northwestern Polytechnical University , Xi’an, Shaanxi 710072, China;2. School of Material Science and Engineering , NPU , Xi’an, Shaanxi 710072, China;3. Department of Physics , Washington University , St. Louis, MO 63130, USA;4. School of Material Science and Engineering , NPU , Xi’an, Shaanxi 710072, China |
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| Abstract: | We have investigated the dynamic and quasi-static mechanical properties of a tungsten fibre-reinforced Zr41.25Ti13.75Ni10Cu12.5Be22.5 bulk metallic glass composite (W/BMG) at temperatures ranging from 77 to 473?K. It was found that the yield stress and elastic modulus of the composite increase while strain-to-failure decreases with decreasing temperature. Tests under uniaxial dynamic compression showed that the W/BMG has a higher yield stress than under quasi-static compression. It was shown that yielding of the composite material is dominated by a shear banding process in the glass matrix, which is essentially a viscous flow as a consequence of local adiabatic heating. The interval between the nominal testing temperature and the temperature at which shear bands initiate is a key factor affecting the shear banding process, rendering the properties of the W/BMG very sensitive to temperature. |
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