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• W2029993828 endingPage "202" @default.
• W2029993828 startingPage "187" @default.
• W2029993828 abstract "The grain boundaries which are present within a polycrystalline aggregate freq uently contribute to strengthening the material because they provide a definite resistance to slip bands or twin bands that otherwise would propagate freely through the microstructure. This result applies at low temperatures and at normal deformation rates for which the boundaries do not contribute to weakening the material by supplying excessive defects nor additional deformation mechanisms to the overall straining process. Experimental and theoretical analyses which bear on this general subject are described in this report. Particular attention is given to the following items:<list list-type=simple><list-item>1. The application of the Hall-Petch relation (δε = δOε + kεl−1/2) to a variety of microstructures and to providing an assessment of the complete stress-strain behaviour;</list-item><list-item>2. The experimental and theoretical application of the stress-grain size analysis to specifying the brittle fracture stress, even for pre-cracked specimens, and to describing the ductile-brittle transition behaviour of various materials; and,</list-item><list-item>3. The dependence on grain size of the hardness, creep, and fatigue properties of several metals and alloys, especially, as these properties are related to the conventional stress-strain behaviour of these same materials.</list-item></list> Résumé Les joints de grains présents dans un agrégat polycristallin contribuent fréquemment à la consolidation du matériau parce qu'ils opposent une résistance à la propagation des bandes de glissement ou de maclage qui, sinon, se propageraient librement au travers de la microstructure. Ce résultat est valable à basses températures et à des vitesses de déformation norm ales, conditions pour lesquelles les joints ne contribuent pas à l'adoucissement du matériau en générant de nombreux défauts ou en étant le siège de mécanismes complémentaires de déformation. Les analyses théoriques et expérimentales qui portent sur ce sujet, sont passées en revue par l'auteur, qui porte une attention particulière aux points suivants:<list list-type=simple><list-item>1. Application de la relation de Hall Petch (δε = δOε + kεl−1/2) à diverses microstructure et évaluation complète de la relation ≪contrainte-déformation≫.</list-item><list-item>2. Application théoriq ue et expérimentale de l'analyse ≪taille du grain-contrainte≫ pour préciser la contrainte de rupture fragile, même pour des échantillons préfissurés, et description de la transition ductile-fragile.</list-item><list-item>3. Influence de la taille du grain sur la dureté, le fluage et la fatigue de nombreux métaux et alliages, avec ampleur mise sur les relations pouvant exister entre ces propriétés et le comportement conventionnel «contrainte-déformation» de ces mêmes matériaux.</list-item></list>" @default.
• W2029993828 created "2016-06-24" @default.
• W2029993828 creator A5041947311 @default.
• W2029993828 date "1974-01-01" @default.
• W2029993828 modified "2023-09-27" @default.
• W2029993828 title "The strengthening or weakening of polycrystals due to the presence of grain boundaries" @default.
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• W2029993828 doi "https://doi.org/10.1179/cmq.1974.13.1.187" @default.
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