Publication

The evolution of the mobile dislocation density during successive stress relaxation transients

Philippe Spätig, Raul Alejandro Bonadé
2008
Journal Articles

Abstract

The successive stress-relaxation (SSR) experiment is a well- known technique that is mainly used to study different aspects of the plastic deformation phenomena. The technique has been described extensively elsewhere [L.P. Kubin, Philos. Mag. 30 (1974) 705; P. Sp¨atig, J. Bonneville, J.- L. Martin, Mater. Sci. Eng. A167 (1993) 73; J. Bonneville, P. Sp¨atig, A. Orlov´a, J.-L. Martin, Proceedings of the 10th International Conference on the Strength of Metals and Alloys, Japan, 1994, pp. 199–202; J.-L. Martin, T. Kruml, J. Alloys Comd. 378 (2004) 2; J.-L-Martin, B. Lo Piccolo, T. Kruml, J. Bonneville, Mater. Sci. Eng. A322 (2002) 118]. In this paper, we briefly review the assumptions in which the analysis of test results is based, within the framework of thermally activated processes. In particular, we review the hypotheses usually invoked regarding the evolution of the mobile dislocation density (ρm) during the overall duration of the SSR experiments. In particular, the SSR data analysis assumes that there is no increase of ρm during the reloading between two successive relaxation transients (quasi-elastic loading). We propose a method to check the self-onsistency of this hypothese. © 2007 Elsevier B.V. All rights reserved.

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Philippe Spätig, Raul Alejandro Bonadé
2008
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/0ae7ae5b-9ed1-4037-97db-62739b2f52f8

About this result

Related concepts (14)

Creep (deformation)

In materials science, creep (sometimes called cold flow) is the tendency of a solid material to undergo slow deformation while subject to persistent mechanical stresses. It can occur as a result of long-term exposure to high levels of stress that are still below the yield strength of the material. Creep is more severe in materials that are subjected to heat for long periods and generally increase as they near their melting point. The rate of deformation is a function of the material's properties, exposure time, exposure temperature and the applied structural load.

Dislocation

In materials science, a dislocation or Taylor's dislocation is a linear crystallographic defect or irregularity within a crystal structure that contains an abrupt change in the arrangement of atoms. The movement of dislocations allow atoms to slide over each other at low stress levels and is known as glide or slip. The crystalline order is restored on either side of a glide dislocation but the atoms on one side have moved by one position. The crystalline order is not fully restored with a partial dislocation.

Alloy

An alloy is a mixture of chemical elements of which at least one is a metal. Unlike chemical compounds with metallic bases, an alloy will retain all the properties of a metal in the resulting material, such as electrical conductivity, ductility, opacity, and luster, but may have properties that differ from those of the pure metals, such as increased strength or hardness. In some cases, an alloy may reduce the overall cost of the material while preserving important properties.

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