Michael Preuss

Michael Preuss
Monash University (Australia) · Materials Science and Engineering

Doctor of Engineering

About

287
Publications
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Introduction
Professor Michael Preuss has a keen interest in understanding the relationship between manufacturing and processing of structural materials and their performance. His research focuses particularly on materials intended for high temperature applications such as titanium and zirconium alloys, nickel-base superalloys and certain types of steels. While we have been using these types of materials for many decades, we are still not able to predict their performance in any other way than recording plen

Publications

Publications (287)
Article
Full-text available
During plastic deformation of engineering alloys with a hcp crystal structure, slip systems with different critical resolved shear stresses can be activated. In the case of two-phase titanium alloys such as Ti-6Al-4V, it is well established that various a→ and c→+a→ type slip systems can be activated in the α-phase, which dominates this alloy. Howe...
Conference Paper
Full-text available
Adsorption of hydrogen (H) can result in severe performance degradation of Ti alloys. In this study, the effect of H on the plasticity of Ti-5Al-7 5V-0.5Si (Ti575) alloy is investigated. High resolution digital image correlation (HRDIC) is employed to elucidate the effect of H on the strain distribution and dislocation slip character of the alloy d...
Article
Full-text available
Twin boundaries (TBs) in Ni-based superalloys are vulnerable sites for failure in demanding environments, and a current lack of mechanistic understanding hampers the reliable lifetime prediction and performance optimisation of these alloys. Here we report the discovery of an unexpected γ″ precipitation mechanism at TBs that takes the responsibility...
Article
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Hydrogen diffusion through the oxide grown on Zr alloys by aqueous corrosion processes plays a critical role in determining the rate of hydrogen pickup (HPU) which can result in embrittlement of fuel cladding and limit the burnup of the nuclear fuel it encapsulates. Mapping the hydrogen/deuterium distributions in these oxide layers, especially in t...
Article
Full-text available
Misorientation data from Electron Backscatter Diffraction (EBSD) is often used to identify strain localisation and quantify plastic strain at the microstructural scale. However, the exact relationship between local plastic strain and misorientation and how it changes at the grain and sub-grain level has not been studied in detail. We have used high...
Article
TIMETALⓇ 407 is a new titanium alloy primarily developed for combining high formability with improved strength compared to commercially pure titanium. In this study, the evolution of microstructure, spherodization behavior of α laths, macro and micro textures during rolling of TIMETALⓇ 407 are examined. For this purpose, TIMETALⓇ 407 with transform...
Article
Full-text available
High-resolution strain mapping is an increasingly prominent technique for characterising the deformation behaviour of metals. In this study, HRDIC analysis was performed on materials exhibiting either more or less intense planar slip, using different software packages to highlight any issues that might arise depending on the algorithm that is used...
Article
Full-text available
Metals with a hexagonal close packed structure can deform by several different slip modes with different Critical Resolved Shear Stresses, which provides a great deal of complexity when considering mechanical performance of Mg, Ti and Zr alloys. Hence, an accurate but also statistically meaningful analysis of active slip systems and their contribut...
Article
The effect of powder size distribution and oxygen content on the extent of multiple twinning and spatial distribution of oxide inclusions in hot isostatic pressed (HIPed)316L steels was investigated using powders with different characteristics. Modifications to, and differences in their microstructural topology, were tracked quantitatively by evalu...
Article
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Accurate prediction of the residual stress distributions in steel welds can only be achieved if consideration is given to solid-state phase transformation behavior. In this work, we assess the ability of a model for reaction kinetics to predict the phase transformations, and corresponding evolution of volumetric strain, in a nuclear pressure vessel...
Article
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High resolution digital image correlation (HRDIC) has been used to quantify the effect of proton irradiation on strain localisation in Zircaloy-4. Confinement of slip to dislocation channels in irradiated material lead to intense, planar slip bands with high effective shear strain values within channels. More diffuse, homogenous slip was observed i...
Article
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Recently, a high-hardness intermetallic phase, named π-ferrosilicide, has been identified within a stainless steel alloy intended to replace Co-based hardfacings within pressurised water reactors. The present study explores the evolution and relationship of the π-ferrosilicide and ferrite phases after a hot isostatic pressing cycle, compared to a c...
Article
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A study into the effects of irradiation temperature on the damage structures that form during proton-irradiation has been carried out on two commercial Zr alloys in order to develop a more mechanistic understanding of the effect of niobium on dislocation loop evolution. The two Zr alloys (Zircaloy-2 and Low-Sn ZIRLO™) were proton irradiated to a da...
Article
Detailed analysis was carried out on proton and a neutron irradiated Nb-containing Zr-alloy to study the evolution of dislocation loop size and densities as well as the formation and evolution of irradiation-induced precipitation/clustering. The results obtained here have been contrasted against previously published work on a Nb-free Zr-alloy [1, 2...
Article
Here we report imaging of hydrogen/deuterium concentrations in δ phase and carbonitrides, and at their interfaces with the matrix in a nickel-based superalloy using Nanoscale Secondary Ion Mass Spectrometry. It is found that δ phase attracts a higher concentration of hydrogen than the matrix during cathodic charging, while carbonitrides adsorb much...
Article
Full-text available
New powder-processed hardfacing Fe-based alloys are being developed to provide high wear and corrosion resistance in demanding pressurised water reactor environments. The triplex stainless steel alloy RR2450, developed from the parent austenitic alloy Tristelle 5183, has been created for this purpose. A detailed study into the stoichiometric sensit...
Article
In pressurised water reactors (PWRs), fuel rods are clad with zirconium alloy tubes chosen for their low neutron capture cross section and good oxidation resistance. Understanding cladding-water corrosion reactions at 280–350 °C and the correlated hydrogen pickup into these Zr alloys is crucial to the safe operation of PWRs and to increasing the bu...
Article
Full-text available
We investigate nano-scale irradiation-induced precipitation in a Zr–Sn–Fe–Cr–Ni-alloy (Zircaloy-2) by combining atom probe tomography (APT) for chemical detail with scanning transmission electron microscopy (STEM) and high resolution energy dispersive X-ray (EDX) spectroscopy for wider context and complimentary and correlative TEM diffraction techn...
Article
Full-text available
Ion irradiation is often used to simulate the effects of neutron irradiation due to reduced activation of materials and vastly increased dose rates. However, the low penetration depth of ions requires the development of small- scale mechanical testing techniques, such as nanoindentation and microcompression, in order to measure me- chanical propert...
Article
Pores and carbides inherited from SX superalloy manufacturing processes usually act as stress concentrators and are preferential sites for fatigue crack initiation. In this study, pore & carbide size, morphology and distribution in a SX superalloy MD2 has been evaluated by X-ray CT. Strain accumulation and fatigue cracking behaviour in MD2, particu...
Article
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The response of Ti3SiC2, Ti3AlC2, Ti2AlC and Cr2AlC MAX phases under simulated primary water has been explored for the first time. Samples were tested for 28 days in 300 °C water with the addition of 2 ppm LiOH. The Ti-based MAX phases formed oxides of TiO and TiFeO3. X-ray diffraction and scanning electron microscopy showed no evidence of a passiv...
Article
Full-text available
https://rdcu.be/K6Er Hardfacing alloys provide strong, wear-resistant and corrosion-resistant coatings for extreme environments such as those within nuclear reactors. Here, we report an ultra-high-strength Fe–Cr–Ni silicide phase, named π-ferrosilicide, within a hardfacing Fe-based alloy. Electron diffraction tomography has allowed the determinati...
Article
Micro slip activation and localization in Ti-6Al-4V deformed in tension have been examined quantitatively using high-resolution (HR) digital image correlation (DIC), HR-electron backscatter diffraction (EBSD) and crystal plasticity finite element modelling. The measured polycrystal slip, strain, lattice rotation and geometrically necessary dislocat...
Article
Full-text available
High Resolution Digital Image Correlation in combination with orientation imaging microscopy has been applied to compare quantitatively strain localisation in Ti-6Al-4V alloy with a bimodal microstructure subjected to two different ageing treatments, i.e. above and below the α2 solvus temperature. Interestingly, the most pronounced strain heterogen...
Article
High Resolution Digital Image Correlation (HRDIC) has been established recently as a novel displacement mapping technique during mechanical loading experiments to quantify strain localisation down to the level of individual slip traces. This is achieved by the creation of a nano-scale gold pattern naturally formed during remodelling of a thin gold...
Article
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Focused ion beam (FIB) is a widely used technique for preparation of electron transparent samples and so it is vital to understand the potential for introduction of FIB-induced microstructural artefacts. The bombardment of both Xe⁺ and Ga⁺ ions is observed to cause extensive monoclinic to tetragonal phase transformation in ZrO2 corrosion films, how...
Article
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The sensitivity to hydrogen embrittlement (HE) has been studied in respect of precipitation size distributions in two nickel-based superalloys: Alloy 718 (UNS N07718) and Alloy 945X (UNS N09946). Quantitative microstructure analysis was carried out by the combination of scanning and transmission electron microscopy and energy dispersive x-ray spect...
Article
Full-text available
This work represents the first use of proton irradiation to simulate in-core radiation damage in Ti3SiC2 and Ti3AlC2 MAX phases. Irradiation experiments were performed to 0.1 dpa at 350 °C, with a damage rate of 4.57 × 10⁻⁶ dpa s⁻¹. The MAX phases displayed significant dimensional instabilities at the crystal level during irradiation leading to lar...
Article
Full-text available
Automated crystal orientation mapping in the transmission electron microscope has been used to simultaneously map the phase, orientation and grain morphology of oxides formed on Zircaloy-2 after 3 and 6 cycles in a BWR reactor in unprecedented detail. For comparison, a region of a pre-oxidised autoclave-formed oxide was also proton irradiated at th...
Article
We used a range of advanced microscopy techniques to study the microstructure, nanoscale chemistry, and porosity in a range of zirconium alloys at different stages of oxidation. Samples from both autoclave and in-reactor conditions were available to compare, including ZIRLOTM, Zr-1.0Nb, and Zr-2.5Nb samples with different heat treatments. Scanning...
Chapter
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The texture evolution during high-temperature rolling (800°C) of two model zirconium-niobium alloys was studied using electron backscatter diffraction. The aim was to decouple the relative importance of deformation and phase transformation on the final texture in an effort to elucidate the origin of the strong α-transverse basal texture commonly fo...
Article
Whether present as a manufactured stabilised ceramic, or as an oxide layer on zirconium alloys, mechanical degradation in zirconia is influenced by the tetragonal to monoclinic phase transformation. Peridynamic theory was implemented within the Abaqus finite element framework to understand how the tetragonal to monoclinic phase transformation can i...
Article
Full-text available
Zr alloys exhibit irradiation-induced growth and hardening which is associated with the defects and dislocation loops that form during irradiation. In this study, state-of-the-art in-situ synchrotron X-ray diffraction (SXRD) and transmission electron microscopy (TEM) techniques were used to investigate the stability of dislocation loops in two prot...
Article
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Hydrogen induced crack initiation in a nickel-based superalloy was studied via in-situ Scanning Electron Microscopy observation under slow strain rate loading. Direct evidence has been obtained of crack initiation and propagation along dislocation slip bands leading to sample fracture. Post-mortem microstructural analysis showed that hydrogen induc...
Article
The grain boundary network evolution of 316L austenitic steel powder during its densification by hot isostatic pressing (HIPing) was investigated. While the as-received powder contained a network of random high angle grain boundaries, the fully consolidated specimen had a large fraction of annealing twins, indicating that during densification, the...
Article
Full-text available
Dislocation structures in neutron irradiated Zircaloy-2 fuel cladding and channel material have been characterized by means of high-resolution synchrotron x-ray diffraction combined with whole peak profile analysis and by transmission electron microscopy (TEM). The samples available for this characterization were taken from high burnup fuel assembl...
Article
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Advancements in transmission electron microscopy allow us to draw correlations between evolving matrix chemistry environments and the resulting dislocation structures that form. Such phenomena are essential in predicting the lifetime of neutron reactor components, but are not well understood at the fundamental level. We investigate the effect of na...
Article
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This study examined the hydrogen embrittlement sensitivity of nickel alloy 718 given four different heat treatments to obtain various microstructural states. The four heat treatments examined are the oil and gas 718 heat treatment, the aerospace 718 heat treatment, and two variant two-step heat treatments, with a difference in aging heat treatment...
Article
Proton-and neutron-irradiated Zircaloy-2 are compared in terms of the nano-scale chemical evolution within second phase particles (SPPs) Zr(Fe,Cr)2and Zr2(Fe,Ni). This is accomplished through ultra-high spatial resolution scanning transmission electron microscopy and the use of energy-dispersive X-ray spectroscopic methods. Fe-depletion is observed...
Article
Many commercial Ti-alloys contain 6 wt% Aluminium and these alloys are prone to precipitation of α2 (Ti3Al). Here, we investigate and quantify the effect of α2 precipitation on strain localisation behaviour for Ti-6Al-4V with an equiaxed microstructure using High Resolution Digital Image Correlation (HR-DIC) in combination with Electron Back Scatte...
Chapter
Polycrystalline nickel-based superalloys for turbine disc applications typically employ complex alloy chemistry in order to produce a high volume fraction of gamma-prime (γ′) precipitates for the optimisation of mechanical properties [1]. The precipitate coarsening causes a gradual loss of coherency between γ′ precipitates and γ matrix when materia...
Article
Full-text available
This study investigated the hydrogen embrittlement sensitivity of the precipitation hardened (PH) alloy 945X in three different metallurgical states. The three variants examined (obtained by different heat treatments) were the standard oil and gas industry condition, and two alternative microstructures with variations in fraction and morphology of...
Article
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Flow formed components undergo a complex deformation mode under biaxial strain, which is expected to have significant impact on the crystallographic texture evolution. X-ray diffraction measurements and calculations of orientation distribution functions (ODFs) were employed to analyse flow formed tubes produced with different parameters such as pre...
Article
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The microstructural evolution and chemistry of the ferrite phase (α), which transforms from the parent austenite phase (γ) of 316L stainless steel during gallium (Ga) ion beam implantation in Focused Ion Beam (FIB) instrument was systematically studied as a function of Ga⁺ ion dose and γ grain orientations. The propensity for initiation of γ → α ph...