Internal Friction and Creep-Recovery in IndiumReport as inadecuate

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Abstract : Using low-stress pseudoshear deformation, we measured the ambient-temperature creep-recovery behavior of polycrystalline indium. The ε-σ diagram shows three regions with increasing stress : stress exponents of 1.05, 7.4, and 2.0. The diagram resembles remarkably the dislocation-velocity-shear-stress diagrams reported for various materials by many authors, who interpreted the diagrams by dislocation dynamics. Applying an extended Burgers model two Kelvin-Voigt elements gave for the three regions the following relaxation times τ2 and τ3 in seconds : 1 11, 123 ; 2 10, 132 ; 3 12, 154. Thus, τ1 is nearly stress independent, and τ2 increases with increasing stress. Laplacean transformation of our εt measurements to get the retardation-time distribution function gln τ indicates in all three regions a strong peak near τ2=3s and a weaker, broader peak near τ3=150s. These agree surprisingly well with the Burgers dashpot-spring-model results. We analyzed the recovery part of the strain εt obtain Q-1f curves.

Author: H. Ledbetter N. Sizova S. Kim H. Kobayashi S. Sgobba L. Parrini



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