A5031945746- Aluminum Alloy Microstructure Properties
- Microstructure and mechanical properties
- Aluminum Alloys Composites Properties
- Electron and X-Ray Spectroscopy Techniques
- Metallurgy and Material Forming
- Non-Destructive Testing Techniques
- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Advanced Welding Techniques Analysis
- Corrosion Behavior and Inhibition
- Advanced Materials Characterization Techniques
- X-ray Diffraction in Crystallography
- Advanced Electron Microscopy Techniques and Applications
- Muon and positron interactions and applications
- Additive Manufacturing Materials and Processes
- Bauxite Residue and Utilization
- Concrete Corrosion and Durability
- Smart Materials for Construction
- Anodic Oxide Films and Nanostructures
- Extraction and Separation Processes
- Electronic and Structural Properties of Oxides
- Advanced Battery Technologies Research
- Quasicrystal Structures and Properties
- Concrete and Cement Materials Research
- Central Venous Catheters and Hemodialysis
SINTEF
2017-2024
SINTEF Industry
2018-2024
Norwegian University of Science and Technology
2014-2023
Trondheim Kommune
2018
University of Toyama
2015-2017
Rutherford Appleton Laboratory
2015
RIKEN Nishina Center
2015
Pitney Bowes (United States)
1991
Precipitation strengthening is a highly complex phenomenon on the nanoscale, responsible for providing strength in Al-Cu, Al-Mg-Cu, Al-Mg-Zn and Al-Mg-Si alloys. Advances methodology, especially high-angle annular dark-field transmission electron microscopy atomistic calculations provide fundamental insights into mechanisms behind precipitation. We are beginning to understand how solute elements form precipitates from Al matrix structures relate. Examples Ω, η' η-phases of Al-Cu Al-Mg-Zn,...
Effects of addition Zn (up to 1 wt%) on microstructure, precipitate structure and intergranular corrosion (IGC) in an Al–Mg–Si alloys were investigated. During ageing at 185 °C, the showed modest increases hardness as function content, corresponding increased number densities needle-shaped precipitates alloy system. No Al–Zn–Mg system found. Using high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), atoms incorporated structures different atomic sites with...
In Al–Mg–Si alloys, additions of only a few weight percent Mg and Si enable formation hardening precipitates during heat treatment. The precipitation is complex influenced by chemical compositions thermo‐mechanical Structural analysis at the atomic scale has played an important role for understanding system. This review paper gives summary influence elements on precipitate structures alloys scale. are modified small different elements, but all encountered structurally connected with network,...
Understanding the cause of lithium dendrites formation and propagation is essential for developing practical all-solid-state batteries. Li are associated with mechanical stress accumulation can cell failure at current densities below threshold suggested by industry research (i.e., >5 mA/cm2). Here, we apply a MHz-pulse-current protocol to circumvent low-current metal cells operating up density 6.5 mA/cm2. Additionally, propose mechanistic analysis experimental results prove that activity...
The precipitation sequence in Al–Zn–Mg alloys has been subject to many revisions over the years as more structural details of early-stage Guinier-Preston (GP) zones and precipitates have uncovered. To further investigate this, a 7003 aluminium alloy naturally aged for one year was subjected artificial ageing at 140 °C evolution precipitates. Scanning transmission electron microscopy coupled with atom probe tomography hardness measurements characterise precipitate structure chemistry...
Scanning transmission electron microscopy imaging of Al–Zn–Mg alloys has provided new information on the atomic structures solute rich clusters forming from a supersaturated solid solution at low temperatures. A unique unit high Zn/Mg ratio is fundamental cluster building block. The essentially partial substitution by Mg and Zn cubic aluminium cell its surrounding truncated cube octahedral shell. simple set principles based Frank–Kasper describes how basic units arrange with respect to each...
A detailed analysis of grain boundaries in a highly textured Al-Mg-Si-Cu alloy is presented this work. Electron backscatter diffraction demonstrates the presence three main categories addition to sub-grain boundaries. These have been systematically analysed using high–resolution scanning transmission electron microscopy. Intergranular corrosion (IGC) susceptibility was statistically correlated with same defined high density metastable Q′-phase boundary particles correlates reduction Cu...
A new methodology has been developed to study the fine details of GP zones in age-hardenable aluminium alloys. It is complementary atomic resolution high-angle annular dark-field scanning transmission electron microscopy imaging, and combines precession diffraction with simulations. To evaluate method, data was collected from an Al-Zn-Mg alloy a condition dense distribution GPI zones. Diffraction patterns were recorded 〈001〉Al orientation, capturing three projections: along unique [001]GPI...
The cyclic application of mechanical stress to aluminum alloys at room temperature, referred as ageing, continuously injects vacancies, enabling dynamic precipitation a fine distribution solute clusters. These are uniformly distributed throughout the bulk and responsible for enhancing properties comparable values T6 conditions obtained by conventional artificial aging. atomic structure clusters in two Al–Zn–Mg (-Cu) is studied using atomically resolved transmission electron microscopy, their...
Welds made by high power laser beam have deep and narrow geometry. Addition of filler wire the arc source, forming laser-arc hybrid welding (LAHW) process, is very important to obtain required mechanical properties. Distribution molten throughout entire weld depth concern since it tends low transportation ability root. Accurate identification metal distribution challenging. Metal-cored wires can provide density non-metallic inclusions (NMIs) which are for acicular ferrite nucleation. be...
Calcium carbonate is by far the most widespread scaling material. Its deposition in pipes and flowlines has been a long-standing problem for many industries. Hence, lot of research devoted to scale inhibition. One calcium management methods relies on removal ions from solution electrochemically enhanced deposition. Application potential between two electrodes may result oxygen reduction water electrolysis. Both processes change local pH close proximity electrodes. Solution anode becoming...
This study demonstrates the application of Al2O3 coatings for high-voltage cathode material LiNi0.5-x Mn1.5+x O4-δ (LNMO) by atomic layer deposition. The ultrathin and uniform (0.6-1.7 nm) were deposited on LNMO particles characterized scanning transmission electron microscopy, inductively coupled plasma mass spectrometry, X-ray photoelectron spectroscopy. Galvanostatic charge discharge cycling in half cells revealed, contrast to many published studies, that even a thickness 1 nm detrimental...
Abstract The effect of natural ageing time before artificial has been investigated in four Al–Mg–Si(–Cu) alloys, with 0.4% Mg + 0.8% Si and Si, both without 0.14 at.% Cu. precipitate microstructure was quantified by means transmission electron microscopy. Varying the storage for 170 min at 200°C, we observe an initial hardness increase after minutes, a decrease several hours another weeks. most pronounced Mg-rich Cu-free alloy, caused reduced volume fraction. Adding Cu produces finer...
As part of an extensive research program to study recent, unexpected intergranular corrosion (IGC) on 6xxx series aluminum alloys (AlMgSi), this paper investigates the mechanism initiation and early propagation IGC extruded AA6005-T5 alloy with small Cu content (0.1 wt%) by use advanced electron microscopy techniques applied for near surface characterization. Corrosion testing was restricted accelerated test according standard BS ISO 11846, involving exposure acidified chloride solution. The...