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490 items found (0 items not approved), displaying 1 to 10.[First/Prev] 1, 2, 3, 4, 5, 6, 7, 8 [Next/Last]

Instruments / Technical Area	Publication Details	Published
I11-High Resolution Powder Diffraction	Zr35Ti35Nb20V5Al5 refractory high entropy alloy designed for low-density, high specific strength and ductility Cameron B. Yousefian , Johan P. Magnussen , Matthew J. Lloyd , Kan Ma , Hannah Wilcox , Alexandra J. Cackett , Alexander J. Knowles Scripta Materialia 265 DOI: 10.1016/j.scriptamat.2025.116733 Diamond Proposal Number(s): [33667] Open Access Show Abstract ▼ Abstract: Refractory high entropy alloys have gained significant interest over the past decade as promising candidates for high-strength applications, particularly at high temperatures. However, achieving ductility and workability at room temperature remains a challenge for large-scale manufacturing and applications. This study explores the design and characterisation of a novel RHEA with low density, high ductility, and high strength at room temperature. High-throughput screening and experimental validation identified a non-equiatomic composition, Zr35Ti35Nb20V5Al5 (at%), which exhibits a room-temperature yield strength of 1030 MPa, 11% tensile strain to failure, and a low density of 6 g/cm3. The alloy's grain size was refined to <20 μm through rolling and recrystallisation, bypassing traditional high-temperature homogenisation while avoiding microsegregation. The tailored Zr35Ti35Nb20V5Al5 RHEA demonstrates a new design approach and processing route, opening applications in next-generation nuclear and aerospace technologies.	Aug 2025
I12-JEEP: Joint Engineering, Environmental and Processing I15-Extreme Conditions	Mechanical properties and deformation mechanisms of metastable β Ti-12Mo alloy fabricated by in-situ alloying-based additive manufacturing Ranxi Duan , Fuzeng Ren , Dingshan Liang , Dominik Daisenberger , Oxana Magdysyuk , Junhua Luan , Zengbao Jiao , Moataz M. Attallah , Biao Cai Additive Manufacturing 107 DOI: 10.1016/j.addma.2025.104819 Diamond Proposal Number(s): [21147, 19558] Show Abstract ▼ Abstract: The strength-ductility trade-off in additively manufactured (AM) β Ti alloys remains a significant challenge. In this study, we employed a cost-effective in-situ alloying laser powder bed fusion approach with optimized processing parameters to fabricate a nearly fully dense, chemically homogeneous β Ti-12Mo alloy. We then examined how solution-treatment duration influences the tensile behavior of the AM Ti-12Mo alloy. The optimally solution-treated alloys exhibited high tensile yield strength (725–741 MPa) and commendable ductility (22–36 %) along both the 0° and 90° orientations relative to the build direction. Focusing on the underlying deformation mechanisms perpendicular to the build direction, we report a uniform elongation of 17.9 % and a pronounced strain hardening rate (∼2300 MPa at 4 %), which we elucidate via in-situ high-energy synchrotron X-ray diffraction and microstructural characterization. The high yield strength is primarily attributed to the presence of Mo-lean embryonic athermal ω nanoparticles. During plastic deformation, both twinning and phase transformation contribute to the high strain hardening rate. At the early stage (strain < 1.9 %), deformation is dominated by {332}< 113 >β twinning, whereas at later stages, the deformation-induced α'' phase becomes significant. The volume fraction of α'' phase increases with strain, supporting the continuous hardening. Notably, irrational {112}< 751 >β, secondary {112}< 111 >β, and {130}< 310 >α'' nano-twins confine the primary structures to nanograins and sustain strain hardening. This study sheds light on designing high-performance β Ti-12Mo alloy via AM followed by heat treatment.	Jun 2025
	Effect of thermomechanical processing on the impact deformation of additively manufactured 316L stainless steel Radim Kocich , Lenka Kunčická , Zifan Wang , Gergely Németh Advanced Engineering Materials 13 DOI: 10.1002/adem.202500144 Open Access Show Abstract ▼ Abstract: This study presents a multifacet analysis of the microstructural mechanics revealing the thermomechanical processing effects on the impact deformation of ANSI 316L stainless steel. The raw material is additively manufactured by laser powder bed fusion. Samples of three states are studied: as-printed (AP), postprocessed via cold rotary swaging (CRS), and postprocessed via hot rotary swaging (HRS). A series of state-of-the-art techniques are employed to evaluate the microstructural properties. This includes the quantification of residual strain (via neutron and X-ray diffraction), substructure development (via electron microscopy), porosity (via X-ray tomography), and microhardness (via indentation). The important findings are: 1) The AP sample features characteristic distributions of residual strain (i.e., tension around the cylinder edge, compression toward the core) and numerous pores; 2) postprocessing via HRS homogenizes the microstructure and eliminated porosity, while CRS causes significant grain refinement and increase in the microhardness but does not significantly reduce porosity; 3) impact deformation induces intensive hardening in the CRS and HRS sample, that they show up to 380 HV1 and 420 HV1 in microhardness; 4) on the contrary, the AP material retains its homogeneity after impact deformation. These important results shed light on enhancing the impact performance of additively manufactured steel through thermomechanical postprocessing.	Jun 2025
labSAXS-Offline SAXS and Sample Environment Development	Order induces toughness in anisotropic colloidal crystal composites Victoria Vilchez , Shitong Zhou , Florian Bouville Proceedings Of The National Academy Of Sciences 122 DOI: 10.1073/pnas.2422532122 Diamond Proposal Number(s): [32442] Open Access Show Abstract ▼ Abstract: Spatial ordering of matter elicits exotic properties sometimes absent from a material’s constituents. A few highly mineralized natural materials achieve high toughness through delocalized damage, whereas synthetic particulate composites must trade toughness for mineral content. We test whether ordering the mineral phase in particulate composites through the formation of macroscopic colloidal crystals can trigger the same damage resistance found in natural materials. Our macroscopic silica rod-based anisotropic colloidal crystal composites are processed fully at room temperature and pressure, reach volume fractions of mineral higher than 80%, and aided by a ductile interface, unveil toughness up to two orders of magnitude higher than bulk silica through the collective movement of rods and damage delocalization over millimeter. These composites demonstrate key design rules to break free from conventionally accepted structural materials’ properties trade-off.	Jun 2025
I12-JEEP: Joint Engineering, Environmental and Processing I22-Small angle scattering & Diffraction	Dynamic precipitation in Al-Zn-Mg-Cu alloys: A comparative analysis of uniaxial tension and cross-die forming Ziyu Ma , Elliot Cooksey-Nash , Madeleine Bignon , Adam Taylor , Joseph Robson , Matthew R. Barnett Journal Of Alloys And Compounds 32 DOI: 10.1016/j.jallcom.2025.180840 Diamond Proposal Number(s): [35872, 30439] Open Access Show Abstract ▼ Abstract: Al-Zn-Mg-Cu alloys are known for their exceptional mechanical properties, primarily achieved through precipitation hardening. This study investigates the dynamic precipitation behaviour in a pre-aged AA7075 alloy under uniaxial tension and cross-die forming at 180 °C. In-situ synchrotron small-angle X-ray scattering (SAXS) revealed a non-monotonic precipitate growth behaviour under uniaxial tension, where growth was initially accelerated but slowed as strain exceeded 7%. Synchrotron SAXS and wide-angle X-ray scattering (WAXS) were used to simultaneously map precipitation and deformation across regions with varied strain conditions in samples subjected to warm cross-die forming demonstrating local variations in precipitation and dislocation arrangement, along with an inverse dependence of precipitate growth on plastic strain. A modified Kampmann-Wagner Numerical (KWN) model was applied to successfully predict the overall precipitation behaviour, highlighting that the competing effects of deformation-induced vacancies enhancing diffusivity and the reduction of supersaturation due to precipitate growth are of primary importance, while the potential influence of strain path in monotonic deformation is of secondary significance.	May 2025
I12-JEEP: Joint Engineering, Environmental and Processing	Development of low-cost Ti alloys with a balanced strength and ductility with generation of ultra-fine microstructures Zhiyi Zou , Matthew K. Dunstan , Brandon Mcwilliams , Stuart Robertson , Richard Hague , Marco Simonelli Journal Of Alloys And Compounds 845 DOI: 10.1016/j.jallcom.2025.180786 Open Access Show Abstract ▼ Abstract: This study aims to understand the interplay between strength and ductility in metastable β-Ti alloys based on eutectoid and neutral elements. A low-cost ternary Ti-7Cr-4Sn alloy was prepared by furnace cooling from the single β region at the end of the primary processing. Although isothermal ω, a nano-precipitation generally considered to embrittle the material, is present in the obtained ultra-fine microstructure, the material still exhibits a balanced strength and ductility, with a yield stress of 1067 MPa and elongation of about 10%. The obtained tensile properties surpass traditional primary processed Ti-6Al-4V, and are comparable to a range of expensive commercial high-strength aerospace Ti alloys. Multiple microstructural features, including grain boundary α (αGB), short rod shape primary α (αP), isothermal ω (ωiso) and ω assisted secondary α (αs) are characterised within the room temperature microstructure. Microstructural analysis reveals that strong Cr segregation in the β phase and slight partitioning of Sn between the α and β phase strengthens the β phase while also preserving ductility in the alloy. This results in a microstructure dominated by the ductile α phase and sub-micron α grain boundaries. This study also discusses the evolution of these microstructural features during different stages of cooling from β matrix, substantiating a promising alloy design strategy for affordable high-performance new Ti alloys.	May 2025
I11-High Resolution Powder Diffraction	Intermetallic dispersion-strengthened ferritic superalloys with exceptional resistance to radiation-induced hardening Kan Ma , Pedro A. Ferreiros , Thomas W. Pfeifer , Robert G. Abernethy , Sophia Von Tiedemann , Nianhua Peng , Graeme Greaves , Colin Ophus , Kai Sun , Anamul H. Mir , Lumin Wang , Shasha Huang , Shijun Zhao , Patrick E. Hopkins , Christopher D. Hardie , Alexander J. Knowles Acta Materialia 398 DOI: 10.1016/j.actamat.2025.121095 Diamond Proposal Number(s): [32708] Open Access Show Abstract ▼ Abstract: Intermetallic dispersion-strengthening (IDS) using nano-scale coherent intermetallic precipitates offers a potent strategy to produce high-strength and radiation-resistant steels, whilst addressing the manufacturability challenges of analogous oxide dispersion-strengthened (ODS) steels. However, their performance with intermetallic stability under irradiation damage, such as radiation-induced hardening (RIH), whilst hypothesised, is undemonstrated. Here, we report on a model IDS α(A2) + α’(L21) Fe-Ni-Al-Ti ferritic superalloy, which exhibits exceptional resistance to RIH with near-zero hardening after irradiation at 300°C 1 dpa, in contrast to significant RIH in a counterpart coarse precipitate alloy (increase in nano-hardness of 1.0 GPa) and Eurofer97 (0.7 GPa). This irradiation resistance is attributed to the high density of semi-coherent precipitate-matrix interfaces, and partial-disordering L21->B2 which causes a decrease in anti-phase boundary energy. High interface density with localised interfacial strain offers effective sinks, suppressing defect populations compared to the counterpart with lower interface density. Meanwhile, atomic resolution spectroscopy and irradiation with in-situ transmission electron microscopy show that the disordering stems from Al-rich and Ti-rich sublattices mixing in the initial L21-Ni2AlTi structure below 500°C, forming metastable B2-Ni(Al,Ti). Combined, the high interface density and radiation-induced intermetallic disordering underpin the remarkable radiation tolerance, demonstrating the IDS concept as a promising radiation-resistant materials design strategy.	May 2025
I12-JEEP: Joint Engineering, Environmental and Processing	In-situ modeling of an FeBYNb metallic glass revealing the Invar effect Alexander Firlus , Mihai Stoica , Pál Jóvári , Olivier Mathon , Robin E. Schäublin , Jörg F. Löffler Materials & Design 24 DOI: 10.1016/j.matdes.2025.113974 Diamond Proposal Number(s): [26608] Open Access Show Abstract ▼ Abstract: Fe-based metallic glasses universally show an exceptionally low coefficient of thermal expansion due to their ferromagnetic interactions. This effect is called the Invar effect and is rarely seen in crystalline materials. With the loss of ferromagnetic ordering at the Curie temperature, the coefficient of thermal expansion increases by up to one order of magnitude. It has been shown that only Fe is responsible for generating and controlling the Invar effect in Fe-based metallic glasses. However, there is no atomistic explanation of how the disordered atomic arrangement enables it. By combining experimental data of synchrotron X-ray diffraction and extended X-ray absorption fine structure experiments via reverse Monte Carlo modeling, we obtain a series of 3D structural models of an (Fe71.2B24Y4.8)96Nb4 bulk metallic glass. Comparison with related ternary metallic glasses shows remarkably similar short- and medium-range order. The models reveal that the Invar effect is not caused by structural rearrangements or change in coordination number. Instead, the magnetic contributions to the interatomic forces stabilize the structure in the ferromagnetic state.	Apr 2025
	Application of strain tomography and contour method to residual stress analysis in additively manufactured CM247LC superalloy parts Fatih Uzun , Mohamed Fares Slim , Hector Basoalto , Konstantinos Liogas , Zifan Ivan Wang , Alexander M. Korsunsky Progress In Additive Manufacturing 8 DOI: 10.1007/s40964-025-01116-2 Open Access Show Abstract ▼ Abstract: Residual stresses are recognized as a critical factor influencing the mechanical performance and structural integrity of additively manufactured parts, particularly in nickel-based superalloys. Although the contour method and strain tomography have been applied independently for residual stress evaluation of such materials, a direct comparison of their reconstructions in laser powder bed fusion fabricated specimens has not been reported. In this study, both techniques were employed on identically produced specimens of CM247LC superalloy, and a strong qualitative agreement in residual elastic strain distributions was observed. Using the contour method, tensile residual stresses up to +1300 MPa were identified near the specimen edges, while compressive stresses approaching − 600 MPa were found in the central regions. Strain tomography, based on synchrotron X-ray diffraction, was used to non-destructively reconstruct internal residual elastic strain fields, revealing consistent trends and capturing localized variations aligned with the contour method. Through this integrated approach, a complete validation of stress reconstruction was achieved, and new insights into the stress evolution of laser powder bed fusion manufactured CM247LC were provided. The findings demonstrate how the complementary strengths of these techniques can be leveraged for improved residual stress characterization in high-performance superalloy parts.	Apr 2025
I22-Small angle scattering & Diffraction	Effect of manufacturing conditions on morphology development in rapid stamp formed polyamide/glass fibre composite laminate components Ellen L. Heeley , Neil Reynolds , William Hamby , Catherine A. Kelly , Michael J. Jenkins , Darren J. Hughes Composites Part A: Applied Science And Manufacturing 10 DOI: 10.1016/j.compositesa.2025.108804 Diamond Proposal Number(s): [22237] Open Access Show Abstract ▼ Abstract: The effect of manufacturing conditions on the morphology of an industrially-processed 11-ply polyamide/glass fibre (PA66-GF60) laminate was investigated. Through-thickness temperature variation during the manufacturing process (pre-heating, stamp forming, demoulding) was revealed via eight inter-ply thermocouples. Thermal and X-ray analysis provided insights into process-induced polymer crystallinity and morphology through the laminate thickness. Cooling rates up to ∼ 2100 °C/min were observed in outer plies, compared to ∼ 420 °C/min for inner plies. A self-heating exothermal phenomenon was observed during crystallisation of the inner layers, leading to increased core crystallinity. X-ray diffraction revealed differences in preferred polymer orientation between the plies. For the inner plies, additional mobility from slower cooling leads to partially oriented crystallites along the glass fibre axis and a well-developed lamellar macromorphology. The rapidly cooled outer plies showed unoriented morphology, without long-range ordering. The work provides detailed understanding of polymer morphology for an industrially-relevant high-volume manufacturing process for thermoplastic matrix components.	Feb 2025

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