Effects of Compression Tests on Point Defects in Pure Ni and Ni-16wt%Cr Model Alloys

Abstract:

On Ni and Ni-16wt%.Cr model-alloys compressed at 30 % and 60 % deformation, point-defects and dislocations concentrations are respectively characterized by positron annihilation spectroscopy and x-ray diffraction analysis. The positron results show that only mono-vacancies are formed during compressive test The X-ray results allows us to quantify the dislocation concentration in the systems. Saturation of defect densities is observed in measurements for these high deformation rates. In support to the experimental work, an homogeneous kinetic model is used to characterize point-defect – dislocation interactions to estimate the kinetics of vacancy restoration to equilibrium concentration.

• Periodical: Defect and Diffusion Forum (Volume 363)
• Pages: 202-209
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.363.202
• Online since: May 2015
• Authors: Patrick Ganster*, A. Borbely, V. Barnier, Pierre Desgardin, Marie France Barthe, Frederic Soisson, Maylise Nastar, Laure Martinelli, Clara Desgranges
• Keywords: Dislocations, Kinetic Model, Model Alloys, Point Defects, Positron Annihilation, Strain Hardening

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