All Outputs (83)

Interlaced layer thicknesses within single laser powder bed fusion geometries (2021)
Journal Article

The geometrical design freedoms associated with additive manufacturing techniques are currently well exploited and finding commercial application. The capability of layer-based processes to allow modification of composition and microstructure in proc... Read More about Interlaced layer thicknesses within single laser powder bed fusion geometries.

Surface integrity in metal machining - Part II: Functional performance (2021)
Journal Article

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.

Multi-laser scan strategies for enhancing creep performance in LPBF (2021)
Journal Article

Laser Powder Bed Fusion (LPBF) enables complex structures to be manufactured, which is attractive to industries where augmented service performance can be achieved. However, the build time of LPBF can be slower than traditional manufacturing processe... Read More about Multi-laser scan strategies for enhancing creep performance in LPBF.

The creep behaviour of nickel alloy 718 manufactured by laser powder bed fusion (2021)
Journal Article

Components manufactured by laser powder bed fusion (LPBF) are limited by their performance for use in critical applications. LPBF materials have microstructural defects, such as suboptimal grain size and morphology, and macroscale anomalies, such as... Read More about The creep behaviour of nickel alloy 718 manufactured by laser powder bed fusion.

Unveiling surfaces for advanced materials characterisation with large-area electrochemical jet machining (2021)
Journal Article

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

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.

Design of a resonant Luneburg lens for surface acoustic waves (2020)
Journal Article

© 2020 In this work we employ additive manufacturing to print a circular array of micropillars on an aluminium slab turning its top surface into a graded index metasurface for surface acoustic waves (SAW). The graded metasurface reproduces a Luneburg... Read More about Design of a resonant Luneburg lens for surface acoustic waves.

Tailored elastic surface to body wave Umklapp conversion (2020)
Journal Article

© 2020, The Author(s). Elastic waves guided along surfaces dominate applications in geophysics, ultrasonic inspection, mechanical vibration, and surface acoustic wave devices; precise manipulation of surface Rayleigh waves and their coupling with pol... Read More about Tailored elastic surface to body wave Umklapp conversion.

Generation of graded porous structures by control of process parameters in the selective laser melting of a fixed ratio salt-metal feedstock (2020)
Journal Article

The demonstration of salt dissolution incorporated within laser powder-bed fusion fabrication processes has allowed the creation of complex porous structures without the need for sophisticated design algorithms. This serves to simplify the process, f... Read More about Generation of graded porous structures by control of process parameters in the selective laser melting of a fixed ratio salt-metal feedstock.

The Influence of Iron in Minimizing the Microstructural Anisotropy of Ti-6Al-4V Produced by Laser Powder-Bed Fusion (2020)
Journal Article

There remains a significant challenge in adapting alloys for metal based Additive Manufacturing (AM). Adjusting alloy composition to suit the process, particularly under regimes close to industrial practice, is therefore a potential solution. With th... Read More about The Influence of Iron in Minimizing the Microstructural Anisotropy of Ti-6Al-4V Produced by Laser Powder-Bed Fusion.

Thermal Activation of Electrochemical Seed Surfaces for Selective and Tunable Hydrophobic Patterning (2020)
Journal Article

Remarkable interfacial behaviors are observed in nature. Our efforts, directed toward replicating the structures, chemistries, and therefore functional properties of natural nonwetting surfaces, are competing with the result of billions of years of n... Read More about Thermal Activation of Electrochemical Seed Surfaces for Selective and Tunable Hydrophobic Patterning.

Performance Verification of a Flexible Vibration Monitoring System (2020)
Journal Article

The performance of measurement or manufacturing systems in high-precision applications is dependent upon the dynamics of the system, as vibration can be a significant contributor to the measurement uncertainty and process variability. Technologies ma... Read More about Performance Verification of a Flexible Vibration Monitoring System.

Laser Induced Phased Arrays (LIPA) to detect nested features in additively manufactured components (2019)
Journal Article

© 2019 The Authors. Additive manufacturing (AM) has the capability to build complex parts with internal features, which have many advantages over conventionally manufactured parts. This makes AM an alternative for advanced manufacturing sectors. AM c... Read More about Laser Induced Phased Arrays (LIPA) to detect nested features in additively manufactured components.

A novel numerical method to predict the transient track geometry and thermomechanical effects through in-situ modification of the process parameters in Direct Energy Deposition (2019)
Journal Article

© 2019 Elsevier B.V. Direct Energy Deposition (DED) is being widely used to repair damaged components to increase service life and economical operation. Process parameters including laser power, traverse speed and the mass flowrate of the feedstock m... Read More about A novel numerical method to predict the transient track geometry and thermomechanical effects through in-situ modification of the process parameters in Direct Energy Deposition.

Spatially resolved acoustic spectroscopy (SRAS) microstructural imaging (2019)
Journal Article

© 2019 Author(s). Spatially resolved acoustic spectroscopy (SRAS) is an acoustic microscopy technique that can image the microstructure and measure the crystallographic orientation of grains or crystals in the material. It works by measuring the velo... Read More about Spatially resolved acoustic spectroscopy (SRAS) microstructural imaging.

Spatially resolved acoustic spectroscopy for texture imaging in powder bed fusion nickel superalloys (2019)
Journal Article

© 2019 Author(s). There is a clear industrial pull to fabricate high value components using premium high temperature aerospace materials by additive manufacturing. Inconveniently, the same material properties which allow them to perform well in servi... Read More about Spatially resolved acoustic spectroscopy for texture imaging in powder bed fusion nickel superalloys.

Spheroidisation of metal powder by pulsed electron beam irradiation (2019)
Journal Article

A new powder spheroidisation process has been demonstrated using a large-area, pulsed electron beam technique. This was used to dramatically improve the surface morphology of Stellite 6 metal powder. Powder surface asperities up to 20??m size can be... Read More about Spheroidisation of metal powder by pulsed electron beam irradiation.

Spatially Resolved Acoustic Spectroscopy Towards Online Inspection of Additive Manufacturing (2019)
Journal Article

High-integrity engineering applications such as aerospace will not permit the incorporation of components containing any structural defects. The current generation of additive manufacturing (AM) platforms yield components with relatively high level... Read More about Spatially Resolved Acoustic Spectroscopy Towards Online Inspection of Additive Manufacturing.

Direct-writing by active tooling in electrochemical jet processing (2019)
Journal Article

Recent innovations in electrochemical jet processing have caused step changes in process flexibility and precision. However, utilisation of these innovations requires the development of new machine tool technology. Presented here is a new methodology... Read More about Direct-writing by active tooling in electrochemical jet processing.

Spatially Resolved Acoustic Spectroscopy Towards Online Inspection of Additive Manufacturing (2018)
Conference Proceeding

High-integrity engineering applications such as aerospace will not permit the incorporation of components containing any structural defects. The current generation of additive manufacturing platforms yield components with relatively high levels of... Read More about Spatially Resolved Acoustic Spectroscopy Towards Online Inspection of Additive Manufacturing.