Shear band widening mechanism in Ti–6Al–4V under high strain rate deformation

Bisht, Anuj; Kumar, Senthil T.; Pang, Xavier; Zhou, Rujun; Roy, Anish; Suwas, Satyam

doi:10.1557/jmr.2020.45

Cited by 4 publications

(4 citation statements)

References 31 publications

(35 reference statements)

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“…During that transition stage, where the magnitude of the softening mechanisms effect starts to equalize the strain/strain rate hardening effect, ASBs propagate through widening mechanisms, providing slight peaks and lows in the τ-γ curve. Figure 24 illustrates the three main ASB widening mechanisms, which are intersecting, branching and intertwining ABSs [151]. In particular, in the case of intersecting ASBs, widening starts by enhancing their junction, resulting in an increased area whose greater width expands along the ASBs (Figure 24a).…”

Section: Asb Evolutionmentioning

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: Asb Evolutionmentioning

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 strain-rate-dependent mechanical properties and structural evolutions should be revealed comprehensively [ 19 , 20 , 21 , 22 , 23 ]. Adiabatic shear bands (ASBs) are obtained at a high strain rate, yielding from the competition between thermal softening and strain/stress-rate hardening within the narrow planar region [ 20 , 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of High Strain Rate on Adiabatic Shearing of α+β Dual-Phase Ti Alloy

Fang

et al. 2021

Materials

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In the present work, the localized features of adiabatic shear bands (ASBs) of our recently designed damage tolerance α+β dual-phase Ti alloy are investigated by the integration of electron backscattering diffraction and experimental and theoretical Schmid factor analysis. At the strain rate of 1.8 × 104 s−1 induced by a split Hopkinson pressure bar, the shear stress reaches a maximum of 1951 MPa with the shear strain of 1.27. It is found that the α+β dual-phase colony structures mediate the extensive plastic deformations along α/β phase boundaries, contributing to the formations of ASBs, microvoids, and cracks, and resulting in stable and unstable softening behaviors. Moreover, the dynamic recrystallization yields the dispersion of a great amount of fine α grains along the shearing paths and in the ASBs, promoting the softening and shear localization. On the contrary, low-angle grain boundaries present good resistance to the formation of cracks and the thermal softening, while the non-basal slipping dramatically contributes to the strain hardening, supporting the promising approaches to fabricate the advanced damage tolerance dual-phase Ti alloy.

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“…The localization takes place by the formation of two-dimensional interfacial regions, which are commonly referred to as shear bands [5,6]. The formation and widening of shear bands is a complex phenomenon, which is influenced by mechanical properties of the material such as work hardening, strain rate sensitivity, and thermal softening [5,7]. These properties depend on the thermodynamic state of the material and its grain structure.…”

Section: Introductionmentioning

confidence: 99%

“…In [8][9][10], results indicate the occurrence of localized melting within shear bands. The gradient of tensile deformation in these regions results in softening due to the temperature rise and/or nucleation of voids, leading to the further concentration of deformation [7][8][9][10]. Therefore, the similarity of regularities between the stress triaxiality and ultimate strain to fracture under quasi-static and dynamic loading conditions is questionable.…”

Section: Introductionmentioning

confidence: 99%

Localization of Plastic Deformation in Ti-6Al-4V Alloy

Skripnyak

2021

Metals

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This article investigated the mechanical behavior of Ti-6Al-4V alloy (VT6, an analog to Ti Grade 5) in the range of strain rates from 0.1 to 103 s−1. Tensile tests with various notch geometries were performed using the Instron VHS 40/50-20 servo hydraulic testing machine. The Digital Image Correlation (DIC) analysis was employed to investigate the local strain fields in the gauge section of the specimen. The Keyence VHX-600D digital microscope was used to characterize full-scale fracture surfaces in terms of fractal dimension. At high strain rates, the analysis of the local strain fields revealed the presence of stationary localized shear bands at the initial stages of strain hardening. The magnitude of plastic strain within the localization bands was significantly higher than those averaged over the gauge section. It was found that the ultimate strain to fracture in the zone of strain localization tended to increase with the strain rate. At the same time, the Ti-6Al-4V alloy demonstrated a tendency to embrittlement at high stress triaxialities.

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Shear band widening mechanism in Ti–6Al–4V under high strain rate deformation

Abstract: Abstract

Cited by 4 publications

References 31 publications

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

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

Effect of High Strain Rate on Adiabatic Shearing of α+β Dual-Phase Ti Alloy

Localization of Plastic Deformation in Ti-6Al-4V Alloy

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