BINDING ENERGY BETWEEN DISLOCATIONS AND PINNING POINTS IN FE-BASED ALLOYS

D. GARGICEVICH; F. G. BONIFACICH; O. A. LAMBRI; J. I. PÉREZ-LANDAZÁBAL; V. RECARTE; G. J. CUELLO

Córdoba

Congreso; Congreso SAM-CONAMET-IBEROMAT 2016; 2016

Thebinding energy between dislocation and pinning points within the range of highhomologues temperatures is of great interest to describing the creep (strainrelaxation) behavior of metals. It should be stressed that to our knowledgethere is no reported in the literature experimental data of this energy tillnow. Dampingmeasurements are very sensitive to the interaction processes betweendislocations and pinning points. Indeed, in previous works it has beendetermined that the behaviour of the strength of the amplitude dependentdamping as a function of temperature is a suitable tool for determining the orderchanges as a function of temperature. A decrease in the order degree leads toan increase in the strength of the amplitude dependent damping, due to the increasein the dislocation mobility [1]. Inthis work, amplitude dependent damping studies were performed in Fe- 6%at. Al- 9%at Si, Fe- 12%at. Al- 12%atSi, Fe- 10%at Si, Fe- 25%at. Al- 8%at Cr and Fe- 25%at. Al- 25%at Cralloys. In addition, a model based on the Friedel study of the amplitudedependent damping as a function of strain and temperature is applied to determinethe binding energy between dislocations and pinning points. It will be shownthat, the binding energy is sensitive to the order state and to the amount of defectspresents in the alloy.