Enhanced resistance to shear instability by gradient nanolayered structures in sputtered Cu/Zr composites

Qin, Feng; Lu, Wenjun; Li, Jianjun

doi:10.1016/j.msea.2022.143253

Cited by 13 publications

(1 citation statement)

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“…More specifically, NC materials have shown a greater propensity to ASB failure compared to conventional metals due to their lower stacking fault energy despite the fact that they revealed sufficient work hardening [125]. Further, multilayered metallic composites have shown vulnerability against shear instability, which, however, can be improved via a gradient layer thickness distribution in the case of Cu/Zr nanolayered composite [126]. In particular, more and thinner nanolayers revealed higher resistance against ASB by increasing dislocation density and preventing strain localization.…”

Section: Nanocrystalline and Ultrafine-grained Materialsmentioning

confidence: 99%

A Review on the Adiabatic Shear Banding Mechanism in Metals and Alloys Considering Microstructural Characteristics, Morphology and Fracture

Karantza,

Manolakos

2023

Metals

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The current review work studies the adiabatic shear banding (ASB) mechanism in metals and alloys, focusing on its microstructural characteristics, dominant evolution mechanisms and final fracture. An ASB reflects a thermomechanical deformation instability developed under high strain and strain rates, finally leading to dynamic fracture. An ASB initially occurs under severe shear localization, followed by a significant rise in temperature due to high strain rate adiabatic conditions. That temperature increase activates thermal softening and mechanical degradation mechanisms, reacting to strain instability and facilitating micro-voiding, which, through its coalescence, results in cracking failure. This work aims to summarize and review the critical characteristics of an ASB’s microstructure and morphology, evolution mechanisms, the propensity of materials against an ASB and fracture mechanisms in order to highlight their stage-by-stage evolution and attribute them a more consecutive behavior rather than an uncontrollable one. In that way, this study focuses on underlining some ASB aspects that remain fuzzy, allowing for further research, such as research on the interaction between thermal and damage softening regarding their contribution to ASB evolution, the conversion of strain energy to internal heat, which proved to be material-dependent instead of constant, and the strain rate sensitivity effect, which also concerns whether the temperature rise reflects a precursor or a result of ASB. Except for conventional metals and alloys like steels (low carbon, stainless, maraging, armox, ultra-high-strength steels, etc.), titanium alloys, aluminum alloys, magnesium alloys, nickel superalloys, uranium alloys, zirconium alloys and pure copper, the ASB propensity of nanocrystalline and ultrafine-grained materials, metallic-laminated composites, bulk metallic glasses and high-entropy alloys is also evaluated. Finally, the need to develop a micro-/macroscopic coupling during the thermomechanical approach to the ASB phenomenon is pointed out, highlighting the interaction between microstructural softening mechanisms and macroscopic mechanical behavior during ASB evolution and fracture.

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Section: Nanocrystalline and Ultrafine-grained Materialsmentioning

confidence: 99%