Publication
The microstructure and tensile properties of pure Ni single crystal irradiated with high energy protons
Résumé
The microstructure and tensile behavior of pure single crystalline Ni irradiated with 590 MeV protons are investigated. First results have been obtained for a damage level of 0.13 dpa at room temperature and 0.002 dpa at 523 K. The irradiation induced defect microstructure observed under transmission electron microscopy consists of loops and stacking fault tetrahedra in a lower density. Tensile tests were performed at room temperature and show observable radiation induced hardening already at 0.002 dpa. Dislocation channels and cells were observed and the transition from the initial channel formation to the development of the deformation cells is investigated. First results are presented here. (C) 2002 Elsevier Science B.V. All rights reserved.
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Concepts associés (30)
Ultimate tensile strength
Ultimate tensile strength (also called UTS, tensile strength, TS, ultimate strength or in notation) is the maximum stress that a material can withstand while being stretched or pulled before breaking. In brittle materials the ultimate tensile strength is close to the yield point, whereas in ductile materials the ultimate tensile strength can be higher. The ultimate tensile strength is usually found by performing a tensile test and recording the engineering stress versus strain.
Essai de traction
thumb|Essai de traction terminé. Un essai de traction est une expérience de physique qui permet d'obtenir des informations sur le comportement élastique, le comportement plastique et le degré de résistance à la rupture d'un matériau, lorsqu'il est soumis à une sollicitation uniaxiale. Certains objets manufacturés doivent avoir un minimum de solidité pour pouvoir supporter les charges, le poids et bien d'autres efforts. L'essai de traction permet de caractériser les matériaux, indépendamment de la forme de l'objet sollicité, ou la performance d'un assemblage mécanique.
Ductilité
La ductilité est la capacité d'un matériau à se déformer plastiquement sans se rompre. La rupture se fait lorsqu'un défaut (fissure ou cavité) devient critique et se propage. Un matériau qui présente une grande déformation plastique à rupture est dit ductile, sinon il est dit fragile. C'est une propriété dite « purement géométrique » : elle ne caractérise qu'un allongement à la rupture (sans unité, ou l'allongement en mètre si la longueur pour l'essai de ductilité est normalisée), indépendamment de l'énergie ou de la contrainte nécessaire à cette rupture.
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