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Hardening (metallurgy)
About: Hardening (metallurgy) is a research topic. Over the lifetime, 25584 publications have been published within this topic receiving 376012 citations.
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TL;DR: Densification and hardening during deformation in a Zr-based glass under multiaxial loading, in a notched tensile geometry is reported, resulting in stable plastic deformation and work hardening at room temperature, suggesting a possibility of designing tough glasses based on their flow properties.
Abstract: The deformation of metallic glasses involves two competing processes: a disordering process involving dilatation, free volume accumulation, and softening, and a relaxation process involving diffusional ordering and densification. For metallic glasses at room temperature and under uniaxial loading, disordering usually dominates, and the glass can fail catastrophically as the softening process runs away in a localized mode. Here we demonstrate conditions where the opposite, unexpected, situation occurs: the densifying process dominates, resulting in stable plastic deformation and work hardening at room temperature. We report densification and hardening during deformation in a Zr-based glass under multiaxial loading, in a notched tensile geometry. The effect is driven by stress-enhanced diffusional relaxation, and is attended by a reduction in exothermic heat and hardening signatures similar to those observed in the classical thermal relaxation of glasses. The result is significant, stable, plastic, extensional flow in metallic glasses, which suggest a possibility of designing tough glasses based on their flow properties.
135 citations
TL;DR: In this paper, the authors present a summary of the current literature available on FeAl vacancies and their affects, including hardness, the yield strength anomaly, and the effect of ternary alloying elements.
135 citations
TL;DR: In this paper, the effects of strain hardening, strain rate sensitivity, thermal softening, heat conduction and the imposed strain rate on the shear localization process in plane strain compression are examined.
135 citations
TL;DR: Inverse methods offer a powerful tool for the identification of the elasto-plastic material parameters as mentioned in this paper, which can deal with heterogeneous deformation fields, and are able to deal with the fact that the unknown material parameters in the FE model are iteratively tuned so as to match the experimentally measured and numerically computed strain fields as closely as possible.
Abstract: Inverse methods offer a powerful tool for the identification of the elasto-plastic material parameters. One of the advantages with respect to classical material testing is the fact that those inverse methods are able to deal with heterogeneous deformation fields. The basic principle of the inverse method that is presented in this paper, is the comparison between experimentally measured strain fields and those computed by the finite element (FE) method. The unknown material parameters in the FE model are iteratively tuned so as to match the experimentally measured and the numerically computed strain fields as closely as possible. This paper describes the application of an inverse method for the identification of the hardening behavior and the yield locus of DC06 steel, based on a biaxial tensile test on a perforated cruciform specimen. The hardening behavior is described by a Swift type hardening law and the yield locus is modeled with a Hill 1948 yield surface.
135 citations
TL;DR: In this article, a set of mechanism-based unified creep ageing constitutive equations has been formulated, which models creep induced evolution of precipitates, dislocation hardening, solid solution hardening and age-precipitation hardening.
135 citations