Zugversuche an Gold-Silberkristallen

Scaling of the fracture toughness of freestanding metallic thin films with the yield strength

“…The increase of the yield strength with the silver content is at first of course understood as an effect of solidsolution strengthening. Although the lattice parameter of gold and silver is basically the same, solid-solution hardening has been repeatedly observed in this system [23,24]. Yet, considering the absolute yield strength increase, the strengthening effect is much stronger in our samples than in the single-crystals tested by Sachs [23] or from the extrapolation from the solid solution strengthening coefficient of 7.8 MPa/c 2/3 reported in the literature [24,25].…”

“…Although the lattice parameter of gold and silver is basically the same, solid-solution hardening has been repeatedly observed in this system [23,24]. Yet, considering the absolute yield strength increase, the strengthening effect is much stronger in our samples than in the single-crystals tested by Sachs [23] or from the extrapolation from the solid solution strengthening coefficient of 7.8 MPa/c 2/3 reported in the literature [24,25]. This is on the one hand in agreement with Rupert et al, who showed that the absolute effect of solidsolution hardening is much stronger in nanocrystalline materials than in their coarse-grained counterparts [26].…”

Formation of misfit dislocations in GaAs/InGaAs multiquantum wells observed by photoluminescence microscopy

“…͑7͒, this equation becomes identical to that derived by Tsao et al who introduced the concept of the constant excess stress to account for the critical thickness of SiGe layers grown on Ge substrates. 24 As a result, the critical stress varies as c(1Ϫc). The dotted curves of Fig.…”

Current pattern of plastic deformation stages

“…Sachs and I. Weerts [3] first established stages in the flow curve. In the next seven decades, the problem of deformation stages was intensively studied (the early history of the problem can be found in [4]).…”