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- W2043134636 abstract "The effect of strain rate on the inelastic properties of nanocrystalline Au films was quantified with 0.85 and 1.76 μm free-standing microscale tension specimens tested over eight decades of strain rate, between 6 × 10−6 and 20 s−1. The elastic modulus was independent of the strain rate, 66 ± 4.5 GPa, but the inelastic mechanical response was clearly rate sensitive. The yield strength and the ultimate tensile strength increased with the strain rate in the ranges 575–895 MPa and 675–940 MPa, respectively, with the yield strength reaching the tensile strength at strain rates faster than 10−1 s−1. The activation volumes for the two film thicknesses were 4.5 and 8.1 b3, at strain rates smaller than 10−4 s−1 and 12.5 and 14.6 b3 at strain rates higher than 10−4 s−1, while the strain rate sensitivity factor and the ultimate tensile strain increased below 10−4 s−1. The latter trends indicated that the strain rate regime 10−5–10−4 s−1 is pivotal in the mechanical response of the particular nanocrystalline Au films. The increased rate sensitivity and the reduced activation volume at slow strain rates were attributed to grain boundary processes that also led to prolonged (5–6 h) and significant primary creep with initial strain rate of the order of 10−7 s−1." @default.
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- W2043134636 date "2010-08-01" @default.
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- W2043134636 title "Strain rate sensitivity of nanocrystalline Au films at room temperature" @default.
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- W2043134636 doi "https://doi.org/10.1016/j.actamat.2010.04.048" @default.
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