H.J. Stone
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View article: The Viability of the Refractory High‐Entropy Alloy AlMo<sub>0.5</sub>NbTa<sub>0.5</sub>TiZr for High‐Temperature Structural Applications
The Viability of the Refractory High‐Entropy Alloy AlMo<sub>0.5</sub>NbTa<sub>0.5</sub>TiZr for High‐Temperature Structural Applications Open
There is significant motivation to produce new structural materials for high‐temperature service, so that enhanced efficiencies can be realized for next‐generation power and propulsion applications. High‐entropy alloys incorporating refrac…
View article: Elasticity, acoustic loss and γ′ dissolution in superalloys from resonant ultrasound spectroscopy
Elasticity, acoustic loss and γ′ dissolution in superalloys from resonant ultrasound spectroscopy Open
The high temperature acoustic loss and elastic moduli of the Ni-based superalloys RR1000, Waspaloy, and Allvac ® 718Plus™ were investigated using resonant ultrasound spectroscopy. An exponential increase in acoustic loss was seen in all al…
View article: Surveying the Effects of Aging a High C-Containing Co-Based Superalloy From the As-Cast and Solution Heat-Treated Conditions
Surveying the Effects of Aging a High C-Containing Co-Based Superalloy From the As-Cast and Solution Heat-Treated Conditions Open
The microstructure of the high carbon-containing cobalt-based superalloy, Co-101, has been studied in the as-cast state and following a variety of heat treatments. In the as-cast state both M 7 C 3 and Mo-rich M 23 C 6 carbides were observ…
View article: Gamma prime precipitation in as-deposited Ni-based superalloy IN713LC
Gamma prime precipitation in as-deposited Ni-based superalloy IN713LC Open
The as-deposited microstructure of an additively manufactured Ni-based superalloy fabricated using laser powder-bed-fusion has been investigated using atomic resolution transmission electron microscopy. It is shown that γ′ precipitates exi…
View article: Evaluating Wagner Oxidation Criteria for Protective Al2O3 Scale Formation in Ni-Based Superalloys
Evaluating Wagner Oxidation Criteria for Protective Al2O3 Scale Formation in Ni-Based Superalloys Open
An assessment is made of the Wagner transition criteria for predicting the formation of a continuous Al 2 O 3 scale in Ni-based superalloys. Predictions are compared with data from an experimental Ni-based superalloy as well as commercial …
View article: Data on the effect of NbC inoculants on the elastic and microstructural evolution of LBP-DED IN718
Data on the effect of NbC inoculants on the elastic and microstructural evolution of LBP-DED IN718 Open
The use of inoculants added to precursor powder is a method of influencing grain growth during fabrication. Niobium carbide (NbC) particles have been added to IN718 gas atomised powder for additive manufacturing via laser-blown-powder dire…
View article: Precipitate nanostructuring that enhances lattice compatibility in a Ti-Fe-Al alloy
Precipitate nanostructuring that enhances lattice compatibility in a Ti-Fe-Al alloy Open
A novel hierarchical microstructure has been identified in a TiFeAl alloy. TEM analysis revealed lens-like features that were comprised of nanoscale domains of an ordered intermetallic B2 phase enveloped by channels of an orthorhombic phas…
View article: Microstructural Stability and Properties of New Nickel‐Base Superalloys with Varying Aluminium: Niobium Ratio
Microstructural Stability and Properties of New Nickel‐Base Superalloys with Varying Aluminium: Niobium Ratio Open
New nickel‐base superalloys with higher temperature capability are required for future, more efficient gas turbine engines. In designing such alloys, careful consideration is required of the elemental concentrations to ensure a suitable ba…
View article: Eutectic composition titanium metal matrix composites for laser powder bed fusion via surface remelt analyses
Eutectic composition titanium metal matrix composites for laser powder bed fusion via surface remelt analyses Open
Ti-based metal matrix composites (MMCs) represent a material class with highly desired performance for the aerospace industry, but implementation has been hindered by poor processability. It is now being realised that MMCs can be formed in…
View article: Effect of NbC inoculants on the elastic properties and microstructure of additively manufactured IN718
Effect of NbC inoculants on the elastic properties and microstructure of additively manufactured IN718 Open
In this study, the effects of NbC inoculants on the elastic properties and microstructure of laser blown powder-directed energy deposition (LBP-DED) IN718 are investigated. The addition of the NbC particles increased the volume fraction of…
View article: On the rate of microstructural degradation of Al-Ta-Ti-Zr refractory metal high entropy superalloys
On the rate of microstructural degradation of Al-Ta-Ti-Zr refractory metal high entropy superalloys Open
Refractory metal high entropy superalloys (RSA) are being developed for high temperature structural applications. However, recently the microstructures of several RSA have been shown to be unstable, precipitating potentially deleterious in…
View article: Influence of Ni:Co ratio and temperature on the lattice misfit of γ-γ' Ni-Co-Al-Ti-Cr alloys
Influence of Ni:Co ratio and temperature on the lattice misfit of γ-γ' Ni-Co-Al-Ti-Cr alloys Open
This study investigated the influence of a systematic variation in Ni:Co ratio on the lattice misfit of γ-γ' Ni-Co-5Al-5Ti-15Cr (at%) alloys over a broad temperature range. Seven model superalloys denoted by their nominal Co content, 0Co, …
View article: On the mechanism of carbide network oxidation and subsequent passivation interference in a high carbon-containing cobalt-based superalloy
On the mechanism of carbide network oxidation and subsequent passivation interference in a high carbon-containing cobalt-based superalloy Open
Oxidation is a life-limiting challenge for components made from cobalt-based superalloys used in high temperature service. However, further elucidation of the oxidation mechanisms is required if new strategies to prolong service life are t…
View article: Hardness variation in inconel 718 produced by laser directed energy deposition
Hardness variation in inconel 718 produced by laser directed energy deposition Open
Directed energy deposition (DED) of Inconel 718 is of critical importance for the repair of aerospace components, which have tight tolerances for certification, particularly on mechanical properties. Significant hardness variation has been…
View article: Phase stability of the Al CrFeCoNi alloy system
Phase stability of the Al CrFeCoNi alloy system Open
The addition of Al to the A1 CrFeCoNi alloy has been shown to promote the formation of intermetallic phases, offering possibilities for the development of alloys with advantageous mechanical properties. However, despite numerous experiment…