Investigation of thermal and mechanical effects during electrically-assisted microbending

Jordan, Adam; Kinsey, Brad L.

doi:10.1016/j.jmatprotec.2015.01.021

Cited by 33 publications

(9 citation statements)

References 18 publications

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“…Based solely on the Joule heating effect, they developed modified thermal-mechanical models, i.e., the Hollomon model and the Johnson-Cook model, to successfully predict the uniaxial true stress-strain response of pure titanium at various current densities. Jordan and Kinsey [15] 6 investigated EA micro-bending of brass sheets and found that the electricity can reduce the strain gradient through the thickness of bending specimens, particularly for coarse grain structures.…”

Section: Introductionmentioning

confidence: 99%

Size effects on flow stress behavior during electrically-assisted micro-tension in a magnesium alloy AZ31

Wang

Jiang³

et al. 2016

Materials Science and Engineering: A

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As one of the promising micro-manufacturing technologies, micro-forming has economical and ecological advantages in terms of mass and near-net-shape production. However, size effects increasingly affect material performances with scaling down geometry and process parameters and consequently hinder applications of micro-forming. Electrically-assisted (EA) micro-forming may have the potential to minimize the size effects. In order to investigate the size effects in the EA micro-forming, uniaxial tension tests were conducted on miniaturized AZ31 tensile samples with varying grain sizes and geometry sizes at a constant DC current density. It was found that the normalized flow stress reduction, i.e., decreases of flow stresses / flow stresses at room temperature (RT), increased with the decrease of the grain size and with the increase of the geometry size at the

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Section: Introductionmentioning

confidence: 99%

Size effects on flow stress behavior during electrically-assisted micro-tension in a magnesium alloy AZ31

Wang

Jiang³

et al. 2016

Materials Science and Engineering: A

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“…For example, Kinsey et al (2013) applied a high strain rate (i.e., ~10 3 s -1 ) in the EA tension of 304SS and Ti-6Al-4V using a Kolsky bar with DC current supply (at current densities of 60 -180 A/mm 2 ), and found no EPE occurred during the tests and flow stress was strongly temperature dependent. Jordan and Kinsey (2015) also did not observe the EPE during the EA three-point bending of brass sheets and it was found that the variations in the bending force were caused by temperature effects. Magargee et al (2013b) cooled the Joule heating temperature down to the room temperature during the EA tension of commercially pure (CP) titanium sheets using forced air, and found that the measured flow stress was consistent with that in the room temperature, which led them conclude that Joule heating dominated the plastic flow in EA forming, while the EPE was negligible.…”

Section: Introductionmentioning

confidence: 90%

Modeling of thermal and mechanical behavior of a magnesium alloy AZ31 during electrically-assisted micro-tension

Wang

Shan

et al. 2016

International Journal of Plasticity

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Many researchers have used a material response function termed ''electroplasticity'' to account for the mechanical behavior of metals subjected to electric current during plastic deformation. However, other researchers claimed that the electrically-assisted (EA) deformation behavior of metals could be successfully characterized using thermal-mechanical constitutive models without the need for electroplasticity theories. In order to examine the controversial mechanisms and determine which dominates the flow stress behavior under EA forming, this work established a flow stress model including the effects of strain hardening, rate hardening, thermal softening, solute-dislocation interaction and electron wind, where the latter three effects were assumed to contribute to the stress drop due to electric current. Additionally, an analytic thermal model was also established to capture the temperature variations during EA tension based on the energy balance between the heat generation due to Joule heating and the heat losses due to conduction and convection. Also, the evolutions of strain rate and strain at specimen center were incorporated into both models to capture the effects of diffuse necking on thermal and mechanical behaviors during EA tension. Uniaxial micro-tension tests were conducted on AZ31 magnesium alloy specimens subjected to continuous electricity with various current densities to verify the proposed models. Results show that the thermal and mechanical models can effectively predict the thermal and mechanical behaviors of the AZ31 magnesium alloy at various current densities in EA micro-tension, respectively. The modeling results also demonstrate that Joule heating is the major factor to affect the deformation behavior under micro-tension subjected to continuous electricity.

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“…Also, electrically insulating materials are required in metallurgical processes including electrically-assisted forging (EAF) and electrically-assisted manufacturing (EAM). [20,[168][169][170] In these cases, various ceramic materials [e.g., aluminum oxide (Al 2 O 3 ), titanium dioxide (TiO 2 ), and zirconium dioxide (ZrO 2 )] have been used, as they meet the requirements for insulating materials, i.e., possess high melting temperatures, experience no phase changes under operating conditions, have low thermal conductivities and diffusivities, and similar thermal expansion coefficients to those of metals. [171] However, there have been only a few reports exploring the use of clays and clay minerals with spraying methods despite the fact that they may also meet these requirements.…”

Section: Thermal and Electrical Insulation Filmsmentioning

confidence: 99%

Supersonic Cold Spraying for Energy and Environmental Applications: One‐Step Scalable Coating Technology for Advanced Micro‐ and Nanotextured Materials

Joshi

Yarin

et al. 2019

Advanced Materials

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Supersonic cold spraying is an emerging technique for rapid deposition of films of materials including micron-size and submicron metal particles, nanoscale ceramic particles, clays, polymers, hybrid materials comprised of polymers and particulates, reduced graphene oxide (rGO), and metal-organic frameworks. In this method, particles are accelerated to a high velocity and then impact a substrate at near ambient temperature, where dissipation of their kinetic energy produces strong adhesion. This manuscript reviews the recent progress in fundamentals and applications of cold spraying. High velocity impact with the substrate results in significant deformation, which not only produces adhesion, but can change the particles' internal structure. Cold-sprayed coatings can also exhibit micro-and nanotextured morphologies not achievable by other means. Suspending micro-or nanoparticles in a liquid and cold-spraying the suspension produces fine atomization and even deposition of materials that could not otherwise be processed. The scalability and low-cost of this method and its This article is protected by copyright. All rights reserved. 3 compatibility with roll-to-roll processing make it promising for many applications, including ultra-thin flexible materials, solar cells, touch-screen panels, nanotextured surfaces for enhanced heat transfer, thermal and electrical insulation films, transparent conductive films, materials for energy storage (e.g. Li-ion battery electrodes), heaters, sensors, photoelectrodes for water splitting, water purification membranes, and self-cleaning films.

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Investigation of thermal and mechanical effects during electrically-assisted microbending

Cited by 33 publications

References 18 publications

Size effects on flow stress behavior during electrically-assisted micro-tension in a magnesium alloy AZ31

Size effects on flow stress behavior during electrically-assisted micro-tension in a magnesium alloy AZ31

Modeling of thermal and mechanical behavior of a magnesium alloy AZ31 during electrically-assisted micro-tension

Supersonic Cold Spraying for Energy and Environmental Applications: One‐Step Scalable Coating Technology for Advanced Micro‐ and Nanotextured Materials

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