Blar i Fakultet for naturvitenskap (NV) på tidsskrift "Acta Materialia"
Viser treff 21-32 av 32
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Precipitate formation in aluminium alloys: Multi-scale modelling approach
(Peer reviewed; Journal article, 2020)Ternary Al–Mg–Si alloys have been modelled based on a multi-scale approach that spans across atomistic and mesoscale models and uses theoretically determined parameters. First, a cluster expansion model for total energy ... -
Quantifying the grain boundary segregation strengthening induced by post-ECAP aging in an Al-5Cu alloy
(Journal article, 2018)Hardening on annealing (HOA) has been frequently observed in nanostructured metals and alloys. For nanostructured materials obtained by severe plastic deformation (SPD), HOA has been attributed to the reduction of dislocation ... -
Random angle grain boundary formation and evolution dynamics during Si directional solidification
(Journal article; Peer reviewed, 2019)The growth of multicrystalline silicon and the formation of a random angle grain boundary, as well as the dislocation generation and expansion is observed dynamically in situ, by Synchrotron X-ray imaging techniques. The ... -
Retrieval of three-dimensional spatial information from fast in situ two-dimensional synchrotron radiography of solidification microstructure evolution
(Journal article; Peer reviewed, 2014)In situ synchrotron X-ray radiography of columnar dendritic growth in Al–15 wt.% Cu–9 wt.% Si–0.015 wt.% Sr alloy has been carried out with the temporal and spatial resolutions of 100 ms and 0.65 μm, respectively. ... -
Revealing the factors influencing grain boundary segregation of P, As in Si: Insights from first-principles
(Journal article; Peer reviewed, 2019)Phosphorous (P) and arsenic (As) segregation at grain boundaries (GBs) usually deteriorate the electrical performance of n-type doped Si-wafers. In order to probe the factors influencing P and As segregation behaviors along ... -
Revealing the heterogeneous nucleation behavior of equiaxed grains of inoculated Al alloys during directional solidification
(Journal article, 2018)An in-situ study on the directional solidification of an inoculated Al-20 wt%Cu alloy under well-controlled constant cooling rates and temperature gradients has been carried out using a microfocus X-radiography set-up. The ... -
Reversal of the negative natural aging effect in Al-Mg-Si alloys
(Journal article, 2012)The effect of solute clustering on subsequent precipitation has been investigated for three different Al–Mg–Si alloys with similar Mg/Si ratios but different Mg + Si contents. Hardness measurements were carried out (i) ... -
The role of grain boundary plane in slip transfer during deformation of magnesium alloys
(Peer reviewed; Journal article, 2022)Slip transfer across grain boundaries (GBs) is an important mechanism for HCP metals to accommodate intergranular deformation incompatibility. In this work, an in-situ SEM/EBSD study was conducted to study basal-slip-induced ... -
Segregation of Mg, Cu and their effects on the strength of Al S5 (210) [001] symmetrical tilt grain boundary
(Journal article; Peer reviewed, 2018)Alien elemental segregation can pronouncedly change the grain boundary properties. Systematic first-principles calculations were performed to investigate the Mg and Cu segregation behavior at Σ5 (210)[001] symmetrical tilt ... -
The interaction between vacancies and twin walls, junctions, and kinks, and their mechanical properties in ferroelastic materials
(Journal article; Peer reviewed, 2019)Vacancies strongly interact with twin boundaries and often change dramatically the properties of the ferroelastic material. However, the understanding of this behavior at an atomic-level is still deficient. Here we study ... -
Vacancy and solute co-segregated η1 interface in over-aged Al-Zn-Mg alloys
(Journal article; Peer reviewed, 2021)We present a combined first-principles and scanning transmission electron microscopy (STEM) study of the η1/Al interfaces in an over-aged Al-Zn-Mg alloy. As one of the major η-MgZn2 precipitate types, η1 tends to form ... -
α-Mg primary phase formation and dendritic morphology transition in solidification of a Mg-Nd-Gd-Zn-Zr casting alloy
(Journal article; Peer reviewed, 2016)Microstructure evolution in the commercial Mg-Nd-Gd-Zn-Zr alloy Elektron 21, solidified under nearly isothermal conditions, has been studied via in-situ X-ray radiography. For cooling rates View the MathML source≤0.075 ...