Grain reorientation and stress-state evolution during cyclic loading of an <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e541" altimg="si1.svg"><mml:mi>α</mml:mi></mml:math>-Ti alloy below the elastic limit

Lim, Rachel E.; Pagan, Darren C.; Shade, Paul A.; Rollett, Anthony D.

doi:10.1016/j.ijfatigue.2021.106614

Cited by 8 publications

(1 citation statement)

References 42 publications

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“…A similar behaviour can be observed in the case of materials subjected to long-term annealing at elevated temperatures [58] or materials exposed to cyclic thermal changes. [59] For example, as reported by Yeadon, [60] the adjustment of the crystallographic lattice orientation in the interface region was obtained during the sintering of copper powder directly on a copper substrate. The reorientation process was caused by a surface diffusion mechanism accompanying the neck formation and their growth and additionally by the migration of the grain boundary through the individual particles.…”

Section: Grain Sizementioning

confidence: 96%

Combined EBSD and Computer-Assisted Quantitative Analysis of the Impact of Spark Plasma Sintering Parameters on the Structure of Porous Materials

Nosewicz

Jurczak

Chromiński

et al. 2022

Metall Mater Trans A

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The paper presents the experimental, numerical, and theoretical investigation of the microstructure of nickel aluminide samples manufactured by spark plasma sintering using electron backscatter diffraction and computer assisted software. The aim of the work was to reveal the evolution of the microscopic and macroscopic parameters related to the microstructure of the material and its dependence on the applied sintering parameters—temperature and pressure. The studied porous samples with different relative density were extracted from various planes and then tested by electron backscatter diffraction to evaluate the crystallographic orientation in every spot of the investigated area. On this foundation, the grain structure of the samples was determined and carefully described in terms of the grain size, shape and boundary contact features. Several parameters reflecting the grain morphology were introduced. The application of the electric current resulting in high temperature and the additional external loading leads to the significant changes in the structure of the porous sample, such as the occurrence of lattice reorientation resulting in grain growth, increase in the grain neighbours, or the evolution of grain ellipticity, circularity, grain boundary length, and fraction. Furthermore, the numerical simulation of heat conduction via a finite element framework was performed in order to analyse the connectivity of the structures. The numerical results related to the thermal properties at the micro- and macroscopic scale—local heat fluxes, deviation angles, and effective thermal conductivity—were evaluated and studied in the context of the microstructural porosity. Finally, the effective thermal conductivity of two-dimensional EBSD maps was compared with those obtained from finite element simulations of three-dimensional micro-CT structures. The relationship between the 2D and 3D results was derived by using the analytical Landauer model.

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Section: Grain Sizementioning

confidence: 96%