In situ characterisation of the strain fields of intragranular slip bands in ferrite by high-resolution electron backscatter diffraction

Koko, Abdalrhaman; Elmukashfi, Elsiddig; Becker, Thorsten Hermann; Karamched, Phani; Wilkinson, Angus J.; Marrow, James

doi:10.1016/j.actamat.2022.118284

Cited by 11 publications

(3 citation statements)

References 131 publications

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“…Typically, slip bands induce surface steps (e.g., roughness due persistent slip bands during fatigue) and a stress concentration which can be a crack nucleation site. Slip bands extend until impinged by a boundary, and the generated stress from dislocations pile-up against that boundary will either stop or transmit the operating slip depending on its (mis)orientation [ 32 , 33 ].…”

Section: Resultsmentioning

confidence: 99%

Influence of Retrogression Time on the Fatigue Crack Growth Behavior of a Modified AA7475 Aluminum Alloy

Yang

Tang

et al. 2023

Materials

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This paper investigates the effect of retrogression time on the fatigue crack growth of a modified AA7475 aluminum alloy. Tests including tensile strength, fracture toughness, and fatigue limits were performed to understand the changes in properties with different retrogression procedures at 180 °C. The microstructure was characterized using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The findings indicated that as the retrogression time increased, the yield strength decreased from 508 MPa to 461 MPa, whereas the fracture toughness increased from 48 MPa√m to 63.5 MPa√m. The highest fracture toughness of 63.5 MPa√m was seen after 5 h of retrogression. The measured diameter of η’ precipitates increased from 6.13 nm at the retrogression 1 h condition to 6.50 nm at the retrogression 5 h condition. Prolonged retrogression also increased the chance of crack initiation, with slower crack growth rate in the long transverse direction compared to the longitudinal direction. An empirical relationship was established between fracture toughness and the volume fraction of age-hardening precipitates, with increasing number density of precipitates seen with increasing retrogression time.

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Section: Resultsmentioning

confidence: 99%

Influence of Retrogression Time on the Fatigue Crack Growth Behavior of a Modified AA7475 Aluminum Alloy

Yang

Tang

et al. 2023

Materials

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“…In fact, the (Ti, Nb)B/Ti 2 AlNb composites with this novel architecture are composed of the soft area (the matrix area) and the stiff area (reinforcement enriched area), as displayed in Figure 3. The appearance of the slip band indicates the activation of the slip system, and generally, the more pronounced the slip band is, the higher the plastic deformation capacity of the material [52,53]. As illustrated in Figure 10a, abundant slip bands emerge on the matrix area adjacent to the fracture surface, which suggests that the soft area provides a better deformation ability.…”

Section: (Ti Nb)b Morphology and Synthesized Amountmentioning

confidence: 97%

Effect of Volume Fraction of Reinforcement on Microstructure and Mechanical Properties of In Situ (Ti, Nb)B/Ti2AlNb Composites with Tailored Three-Dimensional Network Architecture

Zhang

Deng

et al. 2022

Materials

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The mechanical properties of (Ti, Nb)B/Ti2AlNb composites were expected to improve further by utilizing spark plasma sintering (SPS) and inducing the novel three-dimensional network architecture. In this study, (Ti, Nb)B/Ti2AlNb composites with the novel architecture were successfully fabricated by ball milling the LaB6 and Ti2AlNb mixed powders and subsequent SPS consolidation. The influence of the (Ti, Nb)B content on the microstructure and mechanical properties of the composites was revealed by using the scanning electron microscope (SEM), transmission electron microscopy (TEM) and electronic universal testing machine. The microstructural characterization demonstrated that the boride crystallized into a B27 structure and the α2-precipitated amount increased with the (Ti, Nb)B increasing. When the (Ti, Nb)B content reached 4.9 vol%, both the α2 and reinforcement exhibited a continuous distribution along the prior particle boundaries (PPBs). The tensile test displayed that the tensile strength of the composites presented an increasing trend with the increasing (Ti, Nb)B content followed by a decreasing trend. The composite with a 3.2 vol% reinforcement had the optimal mechanical properties; the yield strengths of the composite at 25 and 650 °C were 998.3 and 774.9 MPa, showing an 11.8% and 9.2% improvement when compared with the Ti2AlNb-based alloy. Overall, (Ti, Nb)B possessed an excellent strengthening effect and inhibited the strength weakening of the PPBs area at high temperatures; the reinforcement content mainly affected the mechanical properties of the (Ti, Nb)B/Ti2AlNb composites by altering the α2-precipitated amount and the morphology of (Ti, Nb)B in the PPBs area. Both the continuous precipitation of the brittle α2 phase and the agglomeration of the (Ti, Nb)B reinforcement dramatically deteriorated the mechanical properties.

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“…Microstructural information and local strain measurements can be used to identify individual slip system activities and relate them to the initiation and growth of fatigue cracks. 155 Recent work by Koko et al 156,157 used high-(angular) resolution electron backscatter diffraction (HR-EBSD), as opposed to DIC, to extract local deformation measurements to associate mixed mode SIFs quantitatively in age-hardened duplex stainless-steel.…”

Section: Applicationsmentioning

confidence: 99%

Extracting fracture properties from digital image and volume correlation displacement data: A review

Becker

2023

Strain

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The advent of digital image and volume correlation has attracted wide use in fracture mechanics. The full‐field nature of digital image and volume correlation allows for the integration of computational fracture mechanics to analyse cracked samples quantitatively. This review provides a comprehensive overview of current methods used to extract fracture properties from full‐field displacement data. The term full‐field fracture mechanics is introduced to highlight the uniqueness of using inherently noisy experiential data to extract fracture properties. The review focuses on post‐processing‐based approaches rather than integrated approaches, as these have less limitations and are more commonly employed. There are four approaches that are discussed in extracting fracture properties from experimentally computed displacement data: field‐fitting, integral, crack‐opening and cohesive zone modelling approaches. This is further developed to discuss problems associated with using digital image and volume correlation to extract properties, including application examples.

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In situ characterisation of the strain fields of intragranular slip bands in ferrite by high-resolution electron backscatter diffraction

Cited by 11 publications

References 131 publications

Influence of Retrogression Time on the Fatigue Crack Growth Behavior of a Modified AA7475 Aluminum Alloy

Influence of Retrogression Time on the Fatigue Crack Growth Behavior of a Modified AA7475 Aluminum Alloy

Effect of Volume Fraction of Reinforcement on Microstructure and Mechanical Properties of In Situ (Ti, Nb)B/Ti2AlNb Composites with Tailored Three-Dimensional Network Architecture

Extracting fracture properties from digital image and volume correlation displacement data: A review

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