Composition Gradient and Particle Deformed Zone: An Emerging Correlation

Prakash, Aditya; Tak, Tawqeer Nasir; Lodh, Arijit; Nayan, Niraj; Murty, S. V. S. Narayana; Guruprasad, P. J.; Samajdar, Indradev

doi:10.1007/s11661-018-5076-3

Cited by 10 publications

(4 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This study used direct (ex situ) experimental observations (figure 1(a)) to measure the slip band formation in deformed aluminum alloys (AA1050 and AA2219) with different solute densities. These observations were made, after separating the split samples [63][64][65][66], on the internal long transverse (LT-13) plane. PSC tests were also carried out for non-split single specimens.…”

Section: Resultsmentioning

confidence: 99%

“…Split, channel-die, plane strain compression (SCDPSC) specimens (10 mm × 10 mm × 3 mm: see figure 1(a)) were made by electrical discharge machining. The SCDPSC technique [63][64][65][66] allows direct ex situ observations of microstructural changes for essentially internal grains subjected to PSC under full 3D constraint from all surrounding grains. This appears to be the first time that slip markings on an internal surface, as distinct from a free surface, have been quantitatively characterized.…”

Section: Methodsmentioning

confidence: 99%

“…Such transmission, without the use of Teflon sheets, had been previously noted in an early, unpublished, SCDPSC study on aluminum [67]. Deformation was performed in a deformation simulator (Gleeble TM 3800) at temperatures of 298, 423, 573 and 723 K. Before deformation the specimens were electropolished followed by polishing with sub-micro colloidal silica [66]. The samples were heated at ∼5 K sec −1 to the deformation temperature and held for ∼1 minute before compression.…”

Section: Methodsmentioning

confidence: 99%

“…The experiments used two different polycrystalline aluminum alloys, AA1050 and AA2219, with similar grain sizes and with essentially random crystallographic textures but with very different densities of solute obstacles. Solution treated samples were subjected to plane strain compression (PSC), using a split channel die set-up [63][64][65][66] in a deformation simulator (Gleeble TM ). Direct observations of deformed samples, at different temperatures, of both slip bands and deformed microstructures were made on the internal surfaces of split samples.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Slip band formation in low and high solute aluminum: a combined experimental and modeling study

Prakash¹,

Tak²,

Pai³

et al. 2021

Modelling Simul. Mater. Sci. Eng.

Self Cite

View full text Add to dashboard Cite

Direct ex situ observations related slip band formation with deformed microstructures in commercial AA1050 and AA2219. The samples from both grades had similar grain sizes (∼250 μm) and nearly random crystallographic textures. However, AA2219 contained significantly more solute. Slip bands, on the internal long transverse (LT) plane in split channel die specimens, were characterized by primary spacings (λ) of 2–9 μm, heights (Z) of 160–360 nm and secondary shear strains ( γ LT S ). Higher deformation temperatures for both grades increased λ, decreased, Z and r e d u c e d γ LT S . At all deformation temperatures, AA1050 had smaller λ and higher Z, while AA2219 showed higher γ LT S . In-grain misorientations, but not residual strains, were larger in grains with finer λ in AA1050, but less so in AA2219. Discrete dislocation dynamics (DDD) simulations reported realistic slip bands with slip localizations. The simulations, initiated with static obstacles and sources, led to dislocation interactions and junction formation. The probability of junction stabilization (p) determined the ratio of dynamic sources to obstacles. Slip band formation appeared to be an outcome of the release of piled up dislocations leading to dislocation avalanches. Slip localization increased weakly with finer active slip plane spacing (λ *), giving higher dynamic obstacle strengths and densities, but strongly with smaller p. In particular, the DDD simulations captured experimental patterns of higher slip localizations and dislocation densities in low solute aluminum with finer λ *.

show abstract

Section: Resultsmentioning

confidence: 99%