Browsing SINTEF Open by Author "Li, Yanjun"

Atomistic approach to simulate kink migration and kink-pair formation in silicon: The kinetic activation-relaxation technique

Eliassen, Simen Nut Hansen; Friis, Jesper; Ringdalen, Inga Gudem; Mousseau, Normand; Trochet, Mickaël; Li, Yanjun (Peer reviewed; Journal article, 2019)

The energy conversion efficiency of solar cells based on multicrystalline silicon is greatly deteriorated by dislocations. However, an in-depth understanding on the dislocation motion dynamics down to atomic scale is still ...

Effect of Inclusion and Filtration on Grain Refinement Efficiency of Aluminum Alloy

Yang, Jiawei; Xu, Yijiang; Bao, Sarina; Akhtar, Shahid; Tundal, Ulf; Tjøtta, Stig; Li, Yanjun (Peer reviewed; Journal article, 2022)

It is well known that the filtration efficiency of ceramic foam filters (CFF) on aluminum melt can be significantly reduced by the addition of grain refiner particles under a high inclusion load. Also, it is usually ...

Grain boundary segregation in Pd-Cu-Ag alloys for high permeability hydrogen separation membranes

Løvvik, Ole Martin; Zhao, Dongdong; Li, Yanjun; Bredesen, Rune; Peters, Thijs (Peer reviewed; Journal article, 2018)

Dense metal membranes that are based on palladium (Pd) are promising for hydrogen separation and production due to their high selectivity and permeability. Optimization of alloy composition has normally focused on bulk ...

Heterogeneous nucleation and grain growth of inoculated aluminium alloys: An integrated study by in-situ X-radiography and numerical modelling

Xu, Yijiang; Casari, Daniele; Du, Qiang; Mathiesen, Ragnvald; Arnberg, Lars; Li, Yanjun (Peer reviewed; Journal article, 2017)

A comprehensive study on the heterogeneous nucleation and grain growth of Al-10 wt.%Cu alloys inoculated with Al-5Ti-1B was carried out. To further reveal the solute segregation stifling mechanism, in-situ near-isothermal ...

Improving ageing kinetics and precipitation hardening in an Al-Mg-Si alloy by minor Cd addition

Qian, Feng; Mørtsell, Eva Anne; Marioara, Calin Daniel; Andersen, Sigmund Jarle; Li, Yanjun (Peer reviewed; Journal article, 2018)

This study reports significant improvements in both the age hardening kinetics and peak hardness of an Al-Mg-Si alloy by microalloying with 0.06 at% Cd. A detailed high-angle annular dark-field scanning transmission electron ...

Influence of dispersoids on microstructure evolution and work hardening of aluminium alloys during tension and cold rolling

Zhao, Qinglong; Holmedal, Bjørn; Li, Yanjun (Peer reviewed; Journal article, 2013)

The influence of dispersoids on work hardening of aluminium during tension and cold rolling has been studied by comparing Al–Mn alloys containing similar amounts of solutes but various dispersoid densities. The microstructure ...

The Influences of Grain Refiner, Inclusion Level, and Filter Grade on the Filtration Performance of Aluminum Melt

Yang, Jiawei; Bao, Sarina; Akhtar, Shahid; Tundal, Ulf; Tjøtta, Stig; Li, Yanjun (Peer reviewed; Journal article, 2021)

The addition of grain refiner particles in the aluminum melt is known to reduce the filtration efficiency of ceramic foam filter (CFF). In the present work, a systematic study on the influence of the addition level of ...

The Interactions Between Oxide Film Inclusions and Inoculation Particles TiB2 in Aluminum Melt

Yang, Jiawei; Bao, Sarina; Akhtar, Shahid; Li, Yanjun (Peer reviewed; Journal article, 2021)

In this work, a systematic study on the interactions between aluminum oxide films and TiB2 grain refiner particles and their effect on grain refinement behavior have been conducted. Oxide f ilms were introduced into a ...

Interfacial microstructure formation in A356/steel compound castings using metal coating

Bakke, Aina Opsal; Nordmark, Arne; Arnberg, Lars; Li, Yanjun (Peer reviewed; Journal article, 2020)

Compound castings between aluminum and steel have great potential for applications in the automotive industry. However, due to large differences in thermal and mechanical properties between steel and aluminum, and the ...

Isothermal annealing of cold-rolled Al−Mn−Fe−Si alloy with different microchemistry states

Huang, Ke; Li, Yanjun; Marthinsen, Knut (Peer reviewed; Journal article, 2014)

Microstructural evolution of a cold-rolled Al–Mn–Fe–Si alloy during annealing was studied. Except the as-cast variant, two other different homogenizations were considered, one gave a high density of fine dispersiods providing ...

Precipitation in an A356 foundry alloy with Cu additions - A transmission electron microscopy study

Mørtsell, Eva Anne; Qian, Feng; Marioara, Calin Daniel; Li, Yanjun (Peer reviewed; Journal article, 2019)

The influence of different Cu addition levels on the age hardening and precipitation behaviors in an Al356 foundry alloy during artificial aging treatment has been systematically studied. A detailed characterization of the ...

Prediction of solute diffusivity in Al assisted by first-principles molecular dynamics

Løvvik, Ole Martin; Sagvolden, Espen; Li, Yanjun (Peer reviewed; Journal article, 2014)

Ab initio calculations of the solid-state diffusivity of solute atoms in bulk aluminium have previously been based on transition state theory (TST), employing transition state searches and systematic assessments of single ...

Prominent role of multi-scale microstructural heterogeneities on superplastic deformation of a high solid solution Al–7Mg alloy

Zha, Min; Zhang, Hongmin; Jia, Hailong; Gao, Yipeng; Jin, Shenbao; Sha, Gang; Bjørge, Ruben; Mathiesen, Ragnvald; Roven, Hans Jørgen; Wang, Hui-Yuan; Li, Yanjun (Peer reviewed; Journal article, 2021)

Achieving high superplasticity in single-phase Al alloys remains a challenge, since the fine-grained structure required for superplastic deformation coarsens rapidly in the absence of dispersed second-phase particles during ...