Adiabatic shear band
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High-velocity deformation of Al0.3CoCrFeNi high-entropy alloy: Remarkable resistance to shear failure Open
The mechanical behavior of a single phase (fcc) Al 0.3 CoCrFeNi high-entropy alloy (HEA) was studied in the low and high strain-rate regimes. The combination of multiple strengthening mechanisms such as solid solution hardening, forest dis…
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Ductility by shear band delocalization in the nano-layer of gradient structure Open
Nanostructured (NS) metals typically fail soon after yielding, starting with the formation of narrow shear bands. Here we report the observation of shear band delocalization in gradient metals. Shear bands were nucleated and delocalized in…
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Thermoplasticity and strain localization in transversely isotropic materials based on anisotropic critical state plasticity Open
Summary Geomaterials such as soils and rocks are inherently anisotropic and sensitive to temperature changes caused by various internal and external processes. They are also susceptible to strain localization in the form of shear bands whe…
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High Explosive Ignition through Chemically Activated Nanoscale Shear Bands Open
Shock initiation and detonation of high explosives is considered to be controlled through hot spots, which are local regions of elevated temperature that accelerate chemical reactions. Using classical molecular dynamics, we predict the for…
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Compression properties and impact energy release characteristics of TiZrNbV high-entropy alloy Open
To explore the potential of high-entropy alloys (HEAs) as energetic structural materials (ESMs), the compression behaviors and impact energy release characteristics of TiZrNbV HEA were investigated. Mechanical experiments at strain rates f…
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The modified temperature term on Johnson-Cook constitutive model of AZ31 magnesium alloy with {0002} texture Open
The dynamic compression experiments with Split-Hopkinson Pressure Bar(SHPB) were performed on AZ31 magnesium alloy rolled sheet specimens in the normal direction (AZ31-ND) with {0002} texture at the temperature of 293–523 K and the strain …
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Experimental study on chip deformation of Ti-6Al-4V titanium alloy in cryogenic cutting Open
This paper first develops a cryogenic cutting system with adjustable jet temperature (− 196~20 °C), and then carries out a series of dry cutting and cryogenic turning experiments for titanium alloy. Metallographic microscope is used to obs…
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Gradient structure produces superior dynamic shear properties Open
We report that gradient-structured twinning-induced plasticity steels have much superior dynamic shear properties over homogeneous nanostructured (NS) counterparts. The gradient structure was found to delay the nucleation of adiabatic shea…
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Dynamic compressive properties and microstructural evolution of Al1.19Co2CrFeNi1.81 eutectic high entropy alloy at room and cryogenic temperatures Open
The development of aerospace and military defense sectors has put forward higher requirements for the mechanical properties of metals under extreme conditions. Eutectic high entropy alloys (EHEAs) show a wide potential application in these…
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Hot compression deformation behavior and processing maps of Al–0.5Mg–0.4Si–0.1Cu alloy Open
To improve the hot working stability of Al–0.5Mg–0.4Si–0.1Cu alloy, isothermal compression tests were performed at the temperature range of 350–500 °C and strain rate of 0.001–10 s−1. Strain-compensated Arrhenius constitutive equation cont…
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Instabilities of High Speed Dislocations Open
Despite numerous theoretical and computational works, a clear understanding of dislocations travelling at speeds comparable to those of the speed of sound of the material is lacking. In this thesis, a lattice dynamics model of uniformly mo…
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Characterization of hot deformation behavior of Al0.3CoCrFeNi high-entropy alloy and development of processing map Open
This study presents the characteristics of hot deformation behavior of a Al0.3CoCrFeNi high–entropy alloy in the temperature and strain rate ranges of 1023–1423 K and 10–3–10 s–1, respectively. The constitutive flow behavior was modeled ba…
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The microstructure evolution and deformation mechanism in a casting AM80 magnesium alloy under ultra-high strain rate loading Open
Ultra-high strain rate impact tests were conducted by Split-Hopkinson pressure bar to investigate the microstructure evolution and impact deformation mechanism of a solution treated casting AM80 Mg alloy at 25, 150 and 250 °C with a strain…
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Microstructure characteristic of spray formed 7055 Al alloy subjected to ballistic impact by two different steel core projectiles impact Open
7055 aluminium (Al) alloy was synthesized by spray forming followed by hot extrusion, later subjected to (T6 & T74) aging treatments and its mechanical properties were examined. To investigate the ballistic behavior of the semi-infinite al…
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Adiabatic shear band localization in an Al–Zn–Mg–Cu alloy under high strain rate compression Open
Copyright © 2020 The Authors. An investigation was conducted to study the effect of high strain rate compression on the microstructure and mechanical properties of a spray deposited and hot formed by forging and extrusion followed by T74 (…
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High strain rate deformation of explosion-welded Ti6Al4V/pure titanium Open
Multilayer materials are widely used in military, automobile and aerospace industries. In this paper, the response of an explosion-welded Ti6Al4V/pure titanium with a flat interface to dynamic loading is investigated. An SHPB apparatus is …
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Simulation of metal cutting using the particle finite-element method and a physically based plasticity model Open
Metal cutting is one of the most common metal-shaping processes. In this process, specified geometrical and surface properties are obtained through the break-up of material and removal by a cutting edge into a chip. The chip formation is a…
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Dynamic Shear Deformation of a Precipitation Hardened Al0.7CoCrFeNi Eutectic High-Entropy Alloy Using Hat-Shaped Specimen Geometry Open
Lamellar eutectic structure in Al0.7CoCrFeNi high-entropy alloy (HEA) is emerging as a promising candidate for structural applications because of its high strength-ductility combination. The alloy consists of a fine-scale lamellar fcc + B2…
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The deformation mechanism and adiabatic shearing behavior of extruded Mg-8.0Al-0.1Mn alloy in different heat treated states under high-speed impact load Open
High-speed impact tests were conducted in transverse direction with strain rates (SRs) ranging from 1000 s−1–6000 s−1 to investigate the deformation mechanism and adiabatic shearing behavior of extruded Mg-8.0Al-0.1Mn alloy in as-extruded …
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Mechanical behavior and shear band of a powder-metallurgy-fabricated CoCrFeMnNi high-entropy alloy during high strain-rate deformation Open
High-entropy alloys (HEAs) fabricated by powder metallurgy are considered to exhibit extremely-great potential application values in the field for high-speed impact deformation due to their uniform microstructures and compositions. The mec…
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A Review on the Adiabatic Shear Banding Mechanism in Metals and Alloys Considering Microstructural Characteristics, Morphology and Fracture Open
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 deforma…
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Evading dynamic strength and ductility trade-off in a high-entropy alloy via local chemical ordering Open
Strength-ductility trade-off in metals is sever under dynamic loading due to the strain rate effect and adiabatic shear failure. Here, we demonstrate that both strength and ductility progressively increase with increasing strain rate in a …
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Effect of strain rate on the mechanical properties of a tungsten particle reinforced titanium matrix composite Open
Refractory metal particles can potentially be used to reinforce titanium matrix composites. In this research, a titanium matrix composite reinforced by 20 wt.% tungsten particles (20WP/Ti) was fabricated by powder metallurgy. The mechanica…
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Effect of heat treatment conditions on ballistic behaviour of various zones of friction stir welded magnesium alloy joints Open
Ballistic behaviour of different zones of post-weld heat-treated (PWHT) magnesium alloy (AZ31B) target against 7.62 mm × 39 mm armour-piercing (AP) projectile with a striking velocity of (430±20) m/s was determined. Magnesium alloy (AZ31B)…
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Effect of deep cryogenic treatment on the microstructural, mechanical and ballistic properties of AA7075-T6 aluminum alloy Open
The study focused on investigating the effect of Deep Cryogenic Treatment (DCT) on the mechanical and ballistic properties of AA7075-T6 aluminum alloy. The microstructure, microhardness, tensile strength, and impact strength of the Base Ma…
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An Experimental Study on the Deformation Behavior of Aluminium Armour Plates Impacted by Two Different Non-deformable Projectiles Open
The present study describes the experimental results pertinent to the penetration of AA-2024, AA-6061 and AA-7017 plates with two different non-deformable steel projectiles. The diameters of the projectiles used for ballistic impact testin…
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Strain Localization and Shear Band Propagation in Ductile Materials Open
A model of a shear band as a zero-thickness non-linear interface is proposed and tested using finite element simulations. An imperfection approach is used in this model where a shear band that is assumed to lie in a ductile matrix material…
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An investigation on the hot workability and microstructural evolution of a novel dual-phase Mg–Li alloy by using 3D processing maps Open
Hot compression tests of a novel dual-phase Mg–Li alloy were performed in temperature range of 200–400 °C and strain rate range of 0.01–10s−1. 2D and 3D processing maps were established using Prasad's and Murty's instability criteria (meth…
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Thermo-mechanical characterization and dynamic failure of a CoCrFeNi high-entropy alloy Open
This paper investigates the thermo-mechanical constitutive relationships of a CoCrFeNi high-entropy alloy (HEA) from quasi-static 10−2/s, medium strain rate of 101/s to high strain rates of 5 × 102/s-1.1 × 104/s. A series of tests, with th…
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Influence of Explosive Ratio on Morphological and Structural Properties of Ti/Al Clads Open
The current work focuses on the effect of explosive ratio R on the comprehensive properties of Ti/Al clads manufactured via explosive welding. The lower and upper limits of explosive ratio, namely R1 and R2, were determined according to th…