A comparative study of mechanical and microstructural characteristics of aluminium and titanium undergoing ultrasonic assisted compression testing

Zhou, Haiyang; Cui, Hongzhi; Qin, Qing‐Hua; Wang, Hui; Shen, Y.G.

doi:10.1016/j.msea.2016.11.021

Cited by 60 publications

(18 citation statements)

References 53 publications

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“…When it comes to composites materials, either metal matrices or ceramic matrices, microstructures and interfaces between the reinforcing agents and matrices will have significant effects on the mechanical properties of the materials. In terms of the microstructure, the strengthening mechanism due to refined microstructure usually is estimated based upon the Hall-Petch relationship [35,36]:…”

Section: Discussionmentioning

confidence: 99%

Preparation and mechanical performance of graphene platelet reinforced titanium nanocomposites for high temperature applications

Liu

Yang

et al. 2018

Journal of Alloys and Compounds

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Link to publication on Research at Birmingham portal General rights Unless a licence is specified above, all rights (including copyright and moral rights) in this document are retained by the authors and/or the copyright holders. The express permission of the copyright holder must be obtained for any use of this material other than for purposes permitted by law. • Users may freely distribute the URL that is used to identify this publication. • Users may download and/or print one copy of the publication from the University of Birmingham research portal for the purpose of private study or non-commercial research. • User may use extracts from the document in line with the concept of 'fair dealing' under the Copyright, Designs and Patents Act 1988 (?) • Users may not further distribute the material nor use it for the purposes of commercial gain. Where a licence is displayed above, please note the terms and conditions of the licence govern your use of this document. When citing, please reference the published version. Take down policy While the University of Birmingham exercises care and attention in making items available there are rare occasions when an item has been uploaded in error or has been deemed to be commercially or otherwise sensitive.

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Section: Discussionmentioning

confidence: 99%

Preparation and mechanical performance of graphene platelet reinforced titanium nanocomposites for high temperature applications

Liu

Yang

et al. 2018

Journal of Alloys and Compounds

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“…of the sample is reported [40][41][42]. The phenomenon leading to it was taken to call "anti-barrelling".…”

Section: Methodsmentioning

confidence: 99%

“…In studies on the influence of ultrasonic vibrations on the course of microforming process, often used is micro-upsetting under dry friction conditions [38,39] due to geometric simplicity and relative ease for modelling. In some conditions of upsetting with the use of ultrasonic vibrations, the formation of a specific shape of the lateral surface of the sample is reported [40][41][42]. The phenomenon leading to it was taken to call "anti-barrelling".…”

Section: Introductionmentioning

confidence: 99%

Material Flow in Ultrasonic Orbital Microforming

Presz

2019

Metals

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Ultrasonic orbital microforming—UOM—uses the broadly understood idea of orbital forging but uses very different laws of physics. The only shaping force in this process is the inertia force resulting from the acceleration in the rotary motion of the workpiece. Micro specimen blanked from cold rolled aluminum sheet metal was used in the applied UOM process. Only the upper and lower part of the sample is deformed that gives about 70% of volume. The rest—the middle part—remains undeformed. The final shape of the product is influenced by the shape of the inside of the die in which the UMO process is carried out. However, this effect is not a direct one. The product shape does not repeat the shape of the interior of the die. The preliminary experiments with modular micro-die have been performed on the way of controlling the shape of deformed micro-objects. The microstructure analysis has been done as well as micro-hardness distribution.

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“…Some researchers (14)(15)(16) tried to study the volume effect using the compression or tension test; however, owing to the simplification of the force sensing technology, the real dynamic oscillatory forming forces could not be measured and the average stress of the dynamic oscillatory forming stress was used as the real forming stress in analysis. This misoperation may overestimate the real stress reduction by acoustic softening, since the stress reduction by stress superposition is not taken into consideration.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Material Deformation Characteristics of Ultrasound-assisted Microcompression with Dynamic Force Sensing Technology

Hu¹,

Shimizu²,

Yang³

2019

Sensors and Materials

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Ultrasonic vibration is a promising assistant technology to improve the microforming processes, for example, decreasing friction, enhancing surface finishing, and reducing forming load/stress. However, the mechanism behind the forming stress reduction due to ultrasonic vibration, so-called acoustic softening, is still not totally understood, because in most previous research studies, a simplified force sensing technology, which could not measure the real dynamic ultrasonic force during deformation, was used. In order to solve this issue, an ultrasound-assisted microcompression test system with a die-embedded dynamic force sensor was developed for studying the evolution of acoustic softening. With this system, the stress reduction by acoustic softening can be obtained by separating the stress reduction by stress superposition, which is just an apparent stress reduction due to the averaging of the dynamic oscillatory stress. Then, the stress reduction by stress superposition is verified using a theoretical model, confirming the reliability of the test system. Thus, the evolution of material deformation characteristics can be analyzed. By comparing the stress superposition to acoustic softening, it is found that stress superposition is greater than acoustic softening at the beginning of deformation, especially with a smaller ultrasonic amplitude. Even as the ratio of stress superposition to acoustic softening gradually decreases to some extent with increasing strain, stress superposition still accounts for nearly half of the total stress reduction. The results emphasize the importance of the dynamic force sensing technology in ultrasound-assisted microforming and provide some instructive understanding of the mechanism of acoustic softening.

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A comparative study of mechanical and microstructural characteristics of aluminium and titanium undergoing ultrasonic assisted compression testing

Cited by 60 publications

References 53 publications

Preparation and mechanical performance of graphene platelet reinforced titanium nanocomposites for high temperature applications

Preparation and mechanical performance of graphene platelet reinforced titanium nanocomposites for high temperature applications

Material Flow in Ultrasonic Orbital Microforming

Investigation on Material Deformation Characteristics of Ultrasound-assisted Microcompression with Dynamic Force Sensing Technology

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