Publication

STUDY ON HIGH TEMPERATURE DEFORMATION CHARACTERISTICS OF Cu-0.23%Al2O3 DISPERSION-STRENGTHENED COPPER ALLOY

2009
Journal Articles

Résumé

In order to deeply understand the high temperature deformation behaviors of Cu-0.23%Al2O3 (volume fraction) alloy, the changes of flow stress and microstructure for this alloy after deformation at high temperatures were investigated by using the Gleeble-1500 hot simulator, metallographic microscope and transmission electron microscope. The results show that the flow stress will change significantly with the thermal compression conditions and is mainly divided into three different stages. In addition, the average activation energy and other material parameters of this alloy deformed at high temperatures were obtained, based on them, the constitutive equation of the peak value yield stress-strain rate-temperature was also established. With increasing of compression temperature, the size and number of dynamic recrystallization grains are increased. However in the case of isothermal compression, with increasing of strain rates, the evolution of metallographical microstructures becomes disequilibrium, the size of subgrain is gradually decreased to about 0.5-1 mu m, and the dislocation density is increased at first, and then decreased.

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https://infoscience.epfl.ch/entities/publication/de601601-a94f-4aba-8957-3b1899c76d47

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2009
Journal Articles

Résumé

Source officielle

https://infoscience.epfl.ch/entities/publication/de601601-a94f-4aba-8957-3b1899c76d47

À propos de ce résultat

Concepts associés (32)

Deformation (engineering)

In engineering, deformation refers to the change in size or shape of an object. Displacements are the absolute change in position of a point on the object. Deflection is the relative change in external displacements on an object. Strain is the relative internal change in shape of an infinitesimally small cube of material and can be expressed as a non-dimensional change in length or angle of distortion of the cube. Strains are related to the forces acting on the cube, which are known as stress, by a stress-strain curve.

Déformation plastique

La théorie de la plasticité traite des déformations irréversibles indépendantes du temps, elle est basée sur des mécanismes physiques intervenant dans les métaux et alliages mettant en jeu des mouvements de dislocations (un réarrangement de la position relative des atomes, ou plus généralement des éléments constitutifs du matériau) dans un réseau cristallin sans influence de phénomènes visqueux ni présence de décohésion endommageant la matière. Une des caractéristiques de la plasticité est qu’elle n’apparaît qu’une fois un seuil de charge atteint.

Stress–strain curve

In engineering and materials science, a stress–strain curve for a material gives the relationship between stress and strain. It is obtained by gradually applying load to a test coupon and measuring the deformation, from which the stress and strain can be determined (see tensile testing). These curves reveal many of the properties of a material, such as the Young's modulus, the yield strength and the ultimate tensile strength. Generally speaking, curves representing the relationship between stress and strain in any form of deformation can be regarded as stress–strain curves.

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Publications associées (32)

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STUDY ON HIGH TEMPERATURE DEFORMATION CHARACTERISTICS OF Cu-0.23%Al2O3 DISPERSION-STRENGTHENED COPPER ALLOY

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