Activation Volume in Fine Grained Metals from Stress Relaxation and Nano-Indentation

Yannick Champion; Sophie Nowak

doi:10.4028/www.scientific.net/MSF.584-586.399

Paper Titles

Effect of Texture and Microstructure on Ductility of a Mg-Al-Ca Alloy Processed by Equal Channel Angular Pressing
p.375

Grain Boundary Radiotracer Diffusion of Ni in Ultra-Fine Grained Cu and Cu - 1wt.% Pb Alloy Produced by Equal Channel Angular Pressing
p.380

Influence of a Slip Plane Orientation with Respect to the Shear Plane of ECAP on Microstructure of Copper Single Crystal Subject to One Pressing at Room Temperature
p.387

Grain Refinement of Pure Copper by ECAP
p.393

Activation Volume in Fine Grained Metals from Stress Relaxation and Nano-Indentation
p.399

Ultimate Strength of a Tungsten Heavy Alloy after Severe Plastic Deformation at Quasi-Static and Dynamic Loading
p.405

TEM Studies on the Effect of Nature of Precipitates in Al-Li Alloy on Microstructural Evolution during Severe Plastic Deformation
p.411

Strengthening of Nickel Deformed by High Pressure Torsion
p.417

TEM Study of Local Disordering: A Structural Phase Change Induced by High-Pressure Torsion
p.422

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Activation Volume in Fine Grained Metals from Stress Relaxation and Nano-Indentation

Abstract:

Fine grained copper was studied using the stress relaxation technique and creep testing in nano-indentation, to determine the activation volume involved in the micro-mechanism of the deformation. This material exhibits a near-perfect elasto-plastic deformation, featured by a steep work-hardening, after the elastic domain, followed by flow at a constant stress. Measurements of the activation volumes in the various domains reveal the role of the dislocations and the variation in the dislocation density in the deformation mechanism. This emphasizes the importance, in the determination of the activation volume, of the deformation domain investigated as well as the testing technique used and whether in both cases, the measurement is carried out in a transient domain or condition where variation in dislocation density occurs.