Tamaño de fuente:
BINDING ENERGY BETWEEN DISLOCATIONS AND PINNING POINTS IN FE-BASED ALLOYS
Última modificación: 11-10-2016
Resumen
The binding energy between dislocation and pinning points within the range of high homologuestemperatures is of great interest to describing the creep (strain relaxation) behavior of metals. It should bestressed that to our knowledge there is no reported in the literature experimental data of this energy till now.Damping measurements are very sensitive to the interaction processes between dislocations and pinningpoints. Indeed, in previous works it has been determined that the behaviour of the strength of the amplitudedependent damping as a function of temperature is a suitable tool for determining the order changes as afunction of temperature. A decrease in the order degree leads to an increase in the strength of the amplitudedependent damping, due to the increase in the dislocation mobility [1].In this work, amplitude dependent damping studies were performed in Fe- 6%at. Al- 9%at Si, Fe- 12%at. Al-12%at Si, Fe- 10%at Si, Fe- 25%at. Al- 8%at Cr and Fe- 25%at. Al- 25%at Cr alloys. In addition, a modelbased on the Friedel study of the amplitude dependent damping as a function of strain and temperature isapplied to determine the binding energy between dislocations and pinning points. It will be shown that, thebinding energy is sensitive to the order state and to the amount of defects presents in the alloy.
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