Microstructural Evolution of Tantalum During Deformation and Subsequent Annealing

Microstructure-aware models are necessary to predict the behavior of material based on process knowledge or to extrapolate mechanical properties of materials to environmental conditions which are not easily reproduced in the laboratory, e.g. , nuclear reactor environments. Elemental Ta provides a re...

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Veröffentlicht in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2024-08, Vol.55 (8), p.3077-3091
Hauptverfasser: Brown, Donald W., Anghel, Veronica, Clausen, Bjorn, Pokharel, Reeju, Savage, Daniel J., Vogel, Sven C.
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container_end_page 3091
container_issue 8
container_start_page 3077
container_title Metallurgical and materials transactions. A, Physical metallurgy and materials science
container_volume 55
creator Brown, Donald W.
Anghel, Veronica
Clausen, Bjorn
Pokharel, Reeju
Savage, Daniel J.
Vogel, Sven C.
description Microstructure-aware models are necessary to predict the behavior of material based on process knowledge or to extrapolate mechanical properties of materials to environmental conditions which are not easily reproduced in the laboratory, e.g. , nuclear reactor environments. Elemental Ta provides a relatively simple BCC system in which to develop a microstructural understanding of deformation processes which can then be applied to more complicated BCC alloys. In situ neutron diffraction during compressive deformation and subsequent heat treatment have been used to monitor the evolution of microstructural features in Ta throughout simulated processing steps. Crystallographic texture and dislocation density are determined as a function of first plastic strain, then temperature. Lattice strains are determined and attributed to stresses at macroscopic, grain and dislocation length scales. The increase of the dislocation density through deformation and subsequent recovery during heat treatment is monitored through the changing diffraction line profile. Also, randomization of the texture is used as a signature of recrystallization. The recovery of dislocations through annihilation is not observed to depend on the initial dislocation density in the range studied here. In contrast, recrystallization is observed to depend strongly on the initially dislocation density.
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subjects BCC metals
Characterization and Evaluation of Materials
Chemistry and Materials Science
Crystal dislocations
Crystallography
Deformation
Dislocation density
Evolution
Heat treating
Heat treatment
Lattice strain
Material properties
Materials Science
Mechanical properties
Metallic Materials
Microstructure
Nanotechnology
Neutron diffraction
Nuclear reactors
Original Research Article
Plastic deformation
Recrystallization
Structural Materials
Surfaces and Interfaces
Tantalum
Texture
Thin Films
title Microstructural Evolution of Tantalum During Deformation and Subsequent Annealing
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