A5062171854- Aluminum Alloy Microstructure Properties
- Microstructure and mechanical properties
- Aluminum Alloys Composites Properties
- Corrosion Behavior and Inhibition
- Hydrogen embrittlement and corrosion behaviors in metals
- Magnesium Alloys: Properties and Applications
- Advanced Materials Characterization Techniques
- Bauxite Residue and Utilization
- X-ray Diffraction in Crystallography
- Material Properties and Applications
- Advanced Electron Microscopy Techniques and Applications
- Laser and Thermal Forming Techniques
- Catalysis and Hydrodesulfurization Studies
- Advanced Welding Techniques Analysis
- Electron and X-Ray Spectroscopy Techniques
- Surface and Thin Film Phenomena
- Membrane-based Ion Separation Techniques
- Metal Forming Simulation Techniques
- Nuclear Materials and Properties
- Microstructure and Mechanical Properties of Steels
- Fuel Cells and Related Materials
University of Manchester
2022-2024
Henry Royce Institute
2024
University of Toyama
2017-2020
Abstract Aluminium alloys are re-evaluated as most feasible way to satisfy the industrial needs of light-weight structural materials. However, unlike conventional metals such iron and titanium, aluminium does not have easily accessible secondary phases, which means that aluminium-based cannot be strengthened by harnessing multiple phases. This leaves age hardening only strengthening approach. Highly concentrated precipitates generated generally play a dominant role in shaping mechanical...
Aluminum is one of the most versatile materials for dynamic global economy due to its mechanical properties, recyclability, and lightweight. The production hydrogen from aluminum via hydrolysis in alkaline media offers another advantage it. Recycling post-consumer scraps leads formation some undesirable intermetallic particles which are not only detrimental properties but also repeated recycling. In this study, performance a recycled alloy was compared with that primarily produced one....
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...
Five different heat treatments were applied to AA7075 aluminum alloy, resulting in distinct localized corrosion behaviors 5 wt% NaCl solution. Some exhibited higher intergranular (IGC) susceptibility due the anodic nature of grain boundaries (GBs) caused by Cu depletion precipitate free zones (PFZs) along GBs. Cu-enrichment and an increase intervals between η-phase boundary precipitates (GBPs) did not improve IGC resistance. The open circuit (OCP) galvanostatic (GL) tests could distinguish...
The stress corrosion cracking (SCC) behaviors of over-aged and peak-aged AA7075 aluminum alloys in a 5%wt NaCl solution were compared. Even though the over-aging process induced intergranular (IGC), it decreased SCC susceptibility material. Grain boundaries (GBs) with misorientation angles less than 30° grain matrix considered factors that reduced IGC propagation rate, thereby preventing development SCC. η phase boundary precipitates (GBPs) underwent de-alloying, forming Cu-enriched...
To obtain a fundamental understanding of mechanisms hydrogen embrittlement (HE) and its prevention in advanced high-strength steels containing novel nanoscale mixed-metal precipitates, it is necessary to study local microstructure, H trapping, crack path with new multiscale experimental simulation approach. Spatially resolved mapping via SKPFM used together investigation the using high-resolution EBSD HMPT, global trapping behavior alloys by TDS. These results are combined newly introduced...
Abstract The influence of grain growth inhibition by pearlite on hydrogen embrittlement (HE) behavior ultra-low carbon ferritic steels was studied. Fe-0.02C alloy has a considerable sensitivity to HE, while the Fe and Fe-0.1C materials have lower HE sensitivity. high fraction high-angle boundaries (HAGB) is responsible for shift peak higher temperature in alloy. trapping HAGBs observed mapping. Higher density contributes trap H diffusion coefficient. coexistence enhanced decohesion (HEDE)...
This study demonstrates that the optimisation of electrical processing parameters during plasma electrolytic oxidation allows single-step incorporation nanoparticles with complex 3D structures into outer porous structure growing PEO coating. In particular, this work evaluates zeolite particle uptake mechanism soft sparking regime. Four aluminate-based electrolytes different concentrations (0–10 g l−1) were studied. The encapsulation Ce within (Ce-zeolite) was evaluated by FTIR, SEM/EDS, XRD...
High angle annular dark field scanning transmission electron microscopy has been employed to observe precipitate structures in Al–Zn–Mg and Mg–Zn alloys.η1 are commonly formed by MgZn2 Penrose bricks, but also frequently observed incorporate Mg6Zn7 elongated hexagons via two different modes. Tilings of building blocks both β1′ η1 alloys, create overall patterns which deviate from the chemical structural configuration solely monoclinic Mg4Zn7 or unit cells. Precipitate morphologies were found...
The effect of Cu-addition on age-hardening and precipitation have been investigated by hardness measurement, tensile test, high resolution transmission electron microscopy (HRTEM) angle annular dark field scanning (HAADF-STEM) techniques. Higher hardness, strength, lower elongation were caused increasing amount Zn + Mg because increased number density precipitates. Cu addition also provided even higher peak elongation. alloy containing highest content had fine precipitates GPB-II zones or...
Metastable phases in aluminium alloys are the primary nano-scale precipitates which have biggest contribution to increase tangible mechanical properties. The continuous hardness 7xxx is associated with phase transformation from clusters or GP-zones metastable η′ phase. high-resolution electron imaging used observe and reconstruct a kinetic model that might explain transformation. This work an attempt gain insight into how structural may occur based on shortest route of diffusion for eventual...
The micro-segregation in the as-cast AA6082 aluminium alloy were investigated across a range of length scales using combination analytical electron microscopes. It is found that bands form an inter-connected network following grain boundaries and inter-dendritic channels. can be divided into major minor micro-segregation; former mainly on consisting iron-bearing intermetallic; latter occurs both, along channels, Mg Si alloying elements. atomic-scale imaging reveals minor-segregation bands,...
Convergent beam electron diffraction (CBED) was used to profile the thickness of aluminium alloys foils prepared by using twinjet electropolishing method. The two-beam CBED condition obtained exciting {200}$\{ {200} \}$ and {111}$\{ {111} diffracted g-vector. alloy foil thicknesses were calculated at different distances from sample hole edge. In areas where only one Kossel-Möllenstedt (K-M) minima fringe obtained, determined matching experimental with simulated convergent patterns. far away...
The effect of the cooling rate on precipitation process during homogenization in a balanced Al–0.64Mg–0.32Si mass% alloy was investigated. Different rates (Furnace-cooling/Air-cooling) were used. During air-cooling (∼830 K/h), optical microscopy (OM) revealed that few precipitates could be observed matrix; however, there many “boundaries” formed grains. Transmission electron (TEM) observations confirmed these caused by heterogeneous nucleation along dislocations cooling, and only grew...
Temperature and time dependences of the magnetization Al-Zn-Mg alloys with varying Zn to Mg ratios (Zn/Mg = 0.25, 0.5, 1, 2, 5.5, 9, keeping total concentration plus be 5 at. %) were studied in range from 10 310 K after various periods natural aging. In particular, for Al1−y(Mg2Zn11)y alloys, concentrations also varied 2 20 % (y 0.02, 0.03, 0.04, 0.05, 0.1, 0.2). The largest variant enhanced diamagnetism was observed Al0.95(Mg2Zn11)0.05 as a result solution heat treatment/quenching...