Development of efficient and scalable ultrasound-assisted solidification technologies for manufacturing advanced metallic alloys (Ultra-Cast)
Lead Research Organisation:
Brunel University London
Department Name: Mechanical and Aerospace Engineering
Abstract
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People |
ORCID iD |
Dmitry Eskin (Principal Investigator) |
Publications
Zhao Y
(2018)
3D characterisation of the Fe-rich intermetallic phases in recycled Al alloys by synchrotron X-ray microtomography and skeletonisation
in Scripta Materialia
Wang F
(2021)
A grain refinement mechanism of cast commercial purity aluminium by vanadium
in Materials Characterization
Wang F
(2016)
A refining mechanism of primary Al3Ti intermetallic particles by ultrasonic treatment in the liquid state
in Acta Materialia
Wang C
(2019)
Characterization of Ultrasonic Bubble Clouds in A Liquid Metal by Synchrotron X-ray High Speed Imaging and Statistical Analysis.
in Materials (Basel, Switzerland)
Wang B
(2018)
Data and videos for ultrafast synchrotron X-ray imaging studies of metal solidification under ultrasound.
in Data in brief
Wang F
(2016)
Effect of ultrasonic melt treatment on the refinement of primary Al3Ti intermetallic in an Al-0.4Ti alloy
in Journal of Crystal Growth
Mi J
(2015)
Foreword Advances in Solidification of Metallic Alloys Under External Fields
in Metallurgical and Materials Transactions A
Eskin DG
(2019)
Fundamental studies of ultrasonic melt processing.
in Ultrasonics sonochemistry
Description | Through a specially developed technique of quenching alloy in the process of ultrasonic process, it was discovered that the ultrasonic cavitation has effects on both nucleation and growth of primary intermetallics in Al-Zr and Al-Ti systems. Nucleation is facilitated on oxides, The growth morphology of primary intermetallics changes as as result of cavitation impact. A thorough examination of nucleation mechanism on oxides and of particle fragmentation is on going through high-resolution electron microscopy, X-ray analysis and high-speed filming. The interaction of cavitation bubbles with intermetallics has been for the first time directly observed in water.A fatigue-type mechanisms of fragmentation by oscillating bubbles has been proposed, A eutectic reaction has been confirmed in diluted Al-Zr alloys (contrary to the adopted view on the peritectic reaction in these alloys). |
Exploitation Route | This findings provide a useful tool for selecting regimes of ultrasonic properties for metallic alloys and can be used in casting practice. The fragmentation observations give important data for model validation. |
Sectors | Aerospace Defence and Marine Chemicals Manufacturing including Industrial Biotechology Pharmaceuticals and Medical Biotechnology Transport |
Description | For the first time in this project, we were able to observe in situ the cavitation-driven fragmentation of real intermetallic particles and demonstrate that this process is not instantaneous but rather fatigue-like. This direction of research was further being developed within another project UltraMetl2 with more sophisticated analysis including synchrotron in-situ observation, nanoindentation measurements and acoustic characterisation of shockwaves, which led to numerous highly-cited papers. The deep understanding of the fragmentation mechanisms helps in determining the regimes of ultrasonic melt processing (pressure, temperature, time). Another major finding is that the nucleation of intermetallics on oxides has been confirmed experimentally and opened the way of using oxides as a structure-controlling medium. The role of Zr in ultrasonic-aided structure refinement has been explained and led to a number of follow-up papers. A possible eutectic type of solidification in Al-rich alloys has been suggested, and the (previously unclear) roles of ultrasonic processing and small additions of Ti have been explained by their effect on the Al-Zr eutectics. This project also pioneered a number of research techniques for in-situ observations of ultrasonic-affected nucleation and fragmentation, which are currently widely used by our research groups in studying of a wider range of materials, including graphene. The findings have practical and basic values for various fields where cavitation is currently used or can be used, e.g. food and chemical industry (dispersion and fragmentation, emulsification) and metallurgy (dispersion and fragmentation). A new project proposal is under development to pursue new technological approaches in making hard-to-mix materials based on ultrasonic cavitation. |
First Year Of Impact | 2016 |
Sector | Aerospace, Defence and Marine,Agriculture, Food and Drink,Chemicals,Manufacturing, including Industrial Biotechology,Pharmaceuticals and Medical Biotechnology,Transport |
Impact Types | Economic |
Description | Manchester |
Organisation | University of Manchester |
Country | United Kingdom |
Sector | Academic/University |
PI Contribution | We involved a team of prof. G., Burke of the University of Manchester in an advanced preparation of samples for studying intermetallics in Al alloys. This resulted in publications. |
Collaborator Contribution | The contribution of the University of Manchester was thorough the access and assistance in the preparation of TEM samples by FIB. |
Impact | One paper is published in Acta Materialia and one is submitted to Scripta Materialia. |
Start Year | 2015 |
Description | Moscow |
Organisation | National University of Science and Technology MISiS |
Country | Russian Federation |
Sector | Academic/University |
PI Contribution | We have invited this expert group in thermochemistry to assist us in the thermal analysis of Al-Zr alloys where we have observed an unusual effect. |
Collaborator Contribution | Thermochemistry team from Moscow was able to obtain accurate readings of the phase transformation temperatures, enabling us to establish a eutectic reaction in Al-Zr alloys that have been previously considered as peritectic. |
Impact | As a result of this collaboration one paper has been submitted to Scripta Materialia and one is being prepared to be submitted to a high-ranking journal. |
Start Year | 2016 |
Description | Symposium orgamiser (TMS) |
Form Of Engagement Activity | Scientific meeting (conference/symposium etc.) |
Part Of Official Scheme? | Yes |
Type Of Presentation | workshop facilitator |
Geographic Reach | International |
Primary Audience | Other academic audiences (collaborators, peers etc.) |
Results and Impact | more than 40 abstracts were received, more than 20 papers submitted, leading scientists agreed to be invited speakers. It is expected that new collaborations may arise from this forum, also exchange of ideas and networking are the main objectives. |
Year(s) Of Engagement Activity | 2014 |
URL | http://www.tms.org/meetings/annual-15/AM15home.aspx |