Mechanical Behaviour of Cu-Zr-Al Glassy Nano-Wires
N Yedla and S Pal and A Kumar, JOURNAL OF COMPUTATIONAL AND THEORETICAL NANOSCIENCE, 12, 2332-2338 (2015).
Classical molecular dynamics (MD) simulation deformation studies has been performed to investigate lthe effect of strain rate on the inelastic properties of Cu49Zr49Al2 and Cu45Zr45Al10 metallic glass nanowires (MGNWs) of 10 nm in length by nanoscale uniaxial tensile deformation. The elastic modulus (55.0 +/- 4.0 GPa) is independent of strain rate, but the inelastic mechanical response is sensitive to strain rate. The yield strength (YS) and ultimate tensile strength (UTS) are found to be increased with increasing strain rate. The YS is observed to vary in the range of 320 MPa-1160 MPa and UTS varies from 1210 MPa to 2430 MPa for Cu49Zr49Al2 MGNWs. Whereas YS and UTS are found to vary in the ranges of 460 MPa-1280 MPa and 1090 MPa-2270 MPa respectively for Cu45Zr45Al10 MGNWs. It is observed that flow stress decreased with increase in Aluminum content. This phenomenon is attributed to increase in self-diffusivity values upon addition of aluminium, which has also led to the higher strain rate sensitivity of Cu45Zr45Al10 MGNWs nanowires. It is also found that strain rate sensitivity is increased with ascending strain. An inflection point is observed at 2% strain which is attributed to structural changes during deformation.
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