Dr ALISTAIR SPEIDEL's Outputs (12)

From scrap metal to highly efficient electrodes: harnessing the nanotextured surface of swarf for effective utilisation of Pt and Co for hydrogen production (2024)
Journal Article
Thangamuthu, M., Kohlrausch, E. C., Li, M., Speidel, A., Clare, A. T., Plummer, R., Geary, P., Murray, J. W., Khlobystov, A. N., & Alves Fernandes, J. (2024). From scrap metal to highly efficient electrodes: harnessing the nanotextured surface of swarf for effective utilisation of Pt and Co for hydrogen production. Journal of Materials Chemistry A, 12(25), 15137-15144. https://doi.org/10.1039/d4ta00711e

Hydrogen is considered to be the key element to achieving climate neutrality, leading to a massive demand for electrocatalysts. This work explores the transformation of metal waste into active and stable electrode materials for water splitting by mod... Read More about From scrap metal to highly efficient electrodes: harnessing the nanotextured surface of swarf for effective utilisation of Pt and Co for hydrogen production.

Driving next generation manufacturing through advanced metals characterisation capability (2024)
Journal Article
Clare, A., Seita, M., Speidel, A., Collins, P., & Clark, M. (2024). Driving next generation manufacturing through advanced metals characterisation capability. Scripta Materialia, 246, Article 116009. https://doi.org/10.1016/j.scriptamat.2024.116009

Understanding the effects of manufacturing methods upon materials has driven constant innovation for over 300 years. While our ability to fabricate metallurgical wonders extends into the annals of history our ability to understand the scientific prin... Read More about Driving next generation manufacturing through advanced metals characterisation capability.

Ambient grain orientation imaging on complex surfaces (2023)
Journal Article
Speidel, A., Bisterov, I., Ahmed, S., & Clare, A. T. (2024). Ambient grain orientation imaging on complex surfaces. Acta Materialia, 265, Article 119604. https://doi.org/10.1016/j.actamat.2023.119604

Crystal orientation imaging is generally confined to the laboratory, typically following destructive sectioning, with most current techniques reliant on electron-material interactions that require a vacuum. This information is gathered in a manner th... Read More about Ambient grain orientation imaging on complex surfaces.

Tailoring absorptivity of highly reflective Ag powders by pulsed-direct current magnetron sputtering for additive manufacturing processes (2023)
Journal Article
Wadge, M. D., Lowther, M., Cooper, T. P., Reynolds, W. J., Speidel, A., Carter, L. N., Rabbitt, D., Kudrynskyi, Z. R., Felfel, R. M., Ahmed, I., Clare, A. T., Grant, D. M., Grover, L. M., & Cox, S. C. (2023). Tailoring absorptivity of highly reflective Ag powders by pulsed-direct current magnetron sputtering for additive manufacturing processes. Journal of Materials Processing Technology, 317, Article 117985. https://doi.org/10.1016/j.jmatprotec.2023.117985

Processing of highly reflective and high thermally conductive materials (Cu, Ag, etc.) by laser powder bed fusion (LPBF) is of increasing interest to broaden the range of materials that can be additively manufactured. However, these alloys are challe... Read More about Tailoring absorptivity of highly reflective Ag powders by pulsed-direct current magnetron sputtering for additive manufacturing processes.

Direct Writing Unclonable Watermarks with an Electrochemical Jet (2022)
Journal Article
Speidel, A., Bisterov, I., & Clare, A. T. (2022). Direct Writing Unclonable Watermarks with an Electrochemical Jet. Advanced Functional Materials, 32(51), Article 2208116. https://doi.org/10.1002/adfm.202208116

Counterfeit parts result in significant losses per annum and are often dangerous, therefore they represent a serious concern for manufacturers and end users alike. Easily written but unclonable watermarks undermine the proposition of the counterfeite... Read More about Direct Writing Unclonable Watermarks with an Electrochemical Jet.

Electrolytic-dielectrics: A route to zero recast electrical discharge machining (2022)
Journal Article
Ahmed, S., Speidel, A., Murray, J. W., Ahmed, N., Cuttell, M., & Clare, A. T. (2022). Electrolytic-dielectrics: A route to zero recast electrical discharge machining. International Journal of Machine Tools and Manufacture, 181, Article 103941. https://doi.org/10.1016/j.ijmachtools.2022.103941

Electrical discharge machining (EDM) is a widely used manufacturing process for machining hard or high melting point metals. A characteristic feature of this process is a brittle, porous and rough recast layer on machined surfaces, which undermines i... Read More about Electrolytic-dielectrics: A route to zero recast electrical discharge machining.

Chemical recovery of spent copper powder in laser powder bed fusion (2022)
Journal Article
Speidel, A., Gargalis, L., Ye, J., Matthews, M. J., Spierings, A., Hague, R., Clare, A. T., & Murray, J. W. (2022). Chemical recovery of spent copper powder in laser powder bed fusion. Additive Manufacturing, 52, Article 102711. https://doi.org/10.1016/j.addma.2022.102711

In laser powder bed fusion (LPBF), recovered unfused powder from the powder bed often degrades upon sequential processing through mechanisms like thermal oxidation and particle satelliting from ejected weld spatters and particle-laser interactions. G... Read More about Chemical recovery of spent copper powder in laser powder bed fusion.

A dual material removal mechanism for clearing of obstructed holes via electrical discharge machining (2021)
Journal Article
Castro-Palacios, M., Ahmed, S., Ahmed, N., Murray, J. W., Speidel, A., Duffin, J., Kell, J., & Clare, A. T. (2022). A dual material removal mechanism for clearing of obstructed holes via electrical discharge machining. Manufacturing Letters, 31, 10-14. https://doi.org/10.1016/j.mfglet.2021.12.003

Cooling hole blockages in gas turbine blades can occur during operation, detrimentally reducing performance and resulting in premature removal from service. Here, electrical discharge machining (EDM) is used to unblock fine holes, which have been obs... Read More about A dual material removal mechanism for clearing of obstructed holes via electrical discharge machining.

The interaction of volatile metal coatings during the laser powder bed fusion of copper (2021)
Journal Article
Speidel, A., Wadge, M. D., Gargalis, L., Cooper, T. P., Reynolds, W., Grant, D., Hague, R., Clare, A. T., & Murray, J. W. (2022). The interaction of volatile metal coatings during the laser powder bed fusion of copper. Journal of Materials Processing Technology, 299, Article 117332. https://doi.org/10.1016/j.jmatprotec.2021.117332

The high optical reflectance of Cu at near-infrared wavelengths narrows the process window to fabricate Cu parts by laser powder bed fusion (LPBF). Coating powders with optically absorptive materials has been investigated to improve processability an... Read More about The interaction of volatile metal coatings during the laser powder bed fusion of copper.

Surface integrity in metal machining - Part II: Functional performance (2021)
Journal Article
la Monaca, A., Murray, J. W., Liao, Z., Speidel, A., Robles-Linares, J. A., Axinte, D. A., Hardy, M. C., & Clare, A. T. (2021). Surface integrity in metal machining - Part II: Functional performance. International Journal of Machine Tools and Manufacture, 164, Article 103718. https://doi.org/10.1016/j.ijmachtools.2021.103718

Material removal operations play a pivotal role in the manufacture of key components, required for engineering systems to operate safely and efficiently under ever more advanced functional requirements and over extended life cycles. To further step u... Read More about Surface integrity in metal machining - Part II: Functional performance.

Unveiling surfaces for advanced materials characterisation with large-area electrochemical jet machining (2021)
Journal Article
Speidel, A., Xu, D., Bisterov, I., Mitchell-Smith, J., & Clare, A. T. (2021). Unveiling surfaces for advanced materials characterisation with large-area electrochemical jet machining. Materials and Design, 202, Article 109539. https://doi.org/10.1016/j.matdes.2021.109539

Surface preparation for advanced materials inspection methods like electron backscatter diffraction (EBSD) generally involve laborious and destructive material sectioning and sequential polishing steps, as EBSD is sensitive to both sample topography... Read More about Unveiling surfaces for advanced materials characterisation with large-area electrochemical jet machining.

Surface integrity in metal machining - Part I: Fundamentals of surface characteristics and formation mechanisms (2020)
Journal Article
Liao, Z., la Monaca, A., Murray, J., Speidel, A., Ushmaev, D., Clare, A., Axinte, D., & M'Saoubi, R. (2021). Surface integrity in metal machining - Part I: Fundamentals of surface characteristics and formation mechanisms. International Journal of Machine Tools and Manufacture, 162, 1-51. https://doi.org/10.1016/j.ijmachtools.2020.103687

The surface integrity of machined metal components is critical to their in-service functionality, longevity and overall performance. Surface defects induced by machining operations vary from the nano to macro scale, which cause microstructural, mecha... Read More about Surface integrity in metal machining - Part I: Fundamentals of surface characteristics and formation mechanisms.