Browsing NTNU Open by Author "Li, Yanjun"
Now showing items 1-20 of 128
-
A TEM Study of Weakly Overaged Precipitates in AA 6082
Sulen, Olav (Master thesis, 2016)New models for modeling the material properties for aluminium alloys that can take into consideration the geometry of the needle shaped precipitates, that can be found in 6xxx alloys are being developed. The background for ... -
A Thermodynamic Study on the Effect of Solute on the Nucleation Driving Force, Solid?Liquid Interfacial Energy, and Grain Refinement of Al Alloys
Xu, Yijiang; Zhao, Dongdong; Li, Yanjun (Journal article, 2018)Chemical composition is known to have significant effects on the grain refinement behavior of inoculated Al alloys during solidification. In this study, the influences of solute contents on the thermodynamic nucleation ... -
Accelerated recrystallization by electric current flash heating in cold-rolled Al-5Cu alloy under the influence of concurrent precipitation
Wang, Shubo; Jia, Hailong; Li, Yanjun (Journal article; Peer reviewed, 2019)The influence of flash heating by using a continuous direct current on the recrystallization behavior of an Al-5Cu alloy under the influence of concurrent precipitation of Al2Cu precipitates has been investigated. In ... -
Accelerating precipitation hardening by natural aging in a 6082 Al-Mg-Si alloy
Li, Chunan; Marioara, Calin Daniel; Andersen, Sigmund Jarle; Holmestad, Randi; Li, Yanjun; Hatzoglou, Constantinos (Journal article; Peer reviewed, 2024)It is well known that long time natural aging (NA) after quenching from solution treatment will significantly reduce the precipitation hardening kinetics and peak hardness of most 6xxx aluminum alloys during later artificial ... -
Achieving dispersed fine soft Bi particles and grain refinement in a hypermonotectic Al-Bi alloy by severe plastic deformation and annealing
Zha, Min; Yu, Zhiyuan; Qian, Feng; Wang, Huiyuan; Li, Yanjun; Mathiesen, Ragnvald; Roven, Hans Jørgen (Journal article; Peer reviewed, 2018)The present work revealed that equal-channel angular pressing (ECAP) deformation combined with appropriate annealing could represent as an efficient route to modify immiscible as-cast microstructure of a monotectic Al–8Bi ... -
Achieving high-strength metallurgical bonding between A356 aluminum and copper through compound casting
Bakke, Aina Opsal; Arnberg, Lars; Li, Yanjun (Peer reviewed; Journal article, 2021)Due to stable surface oxides on the solid copper surface and the ease of forming Al2O3 films at the aluminum melt surface, it is difficult to achieve high-strength metallurgical bonding between the two materials through ... -
Achieving superior dispersion-strengthening effect in an AA5xxx Al-Mg-Mn alloy by mico-alloying
Pan, Shiwei; Wang, Zidong; Li, Chunan; Wan, Di; Chen, Xiaohua; Chen, Kaixuan; Li, Yanjun (Peer reviewed; Journal article, 2023)5xxx Al-Mg based alloys are widely applied as non-heat-treatable alloys. In this work, we designed a dispersion-strengthening Al-4Mg-1Mn-0.3Fe-0.2Si-0.2Zr-0.2Cr (wt.%) alloy. By applying ramp heating and 400 °C isothermal ... -
Al-5Cu alloy processed by equal-channel angular pressing
Jia, Hailong; Marthinsen, Knut; Li, Yanjun (Journal article; Peer reviewed, 2017)An ECAP (equal channel angular pressing) processed UFG Al-5Cu alloy was characterized by electron backscatter diffraction (EBSD). It is revealed that a bimodal grain structure, i.e. ultrafine grains accompanied by micron-sized ... -
AlSi10Mg alloy nanocomposites reinforced with aluminum-coated graphene: Selective laser melting, interfacial microstructure and property analysis
Zhao, Zhanyong; Bai, Peikang; Misra, RDK; Dong, Mengyao; Guan, Renguo; Li, Yanjun; Zhang, Jiaoxia; Tan, Le; Gao, Jianfeng; Ding, Tao; Du, Wenbo; Guo, Zhanhu (Journal article; Peer reviewed, 2019)Graphene has been successfully coated with a nano-Al layer through a novel activating treatment (i.e., organic aluminum reduction method). The nano-Al coated graphene was further processed into AlSi10Mg alloy based composites ... -
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 (Journal article; Peer reviewed, 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 ... -
Carbon segregation at Σ3 {112} grain boundaries in silicon
Zhao, Dongdong; Li, Yanjun (Journal article; Peer reviewed, 2018)First-principles calculations were carried out to systematically investigate the carbon segregation along Σ3 {1 1 2} grain boundaries (GBs) in silicon. The energetically favorable segregation sites and corresponding ... -
Characterization of Iron Bearing Particles in Relation to Fir-Tree Structure in Al-Mg Alloys
Solli, Idun (Master thesis, 2018)Fir-tree structure is a well-known problem related to DC cast AA1xxx and AA5xxx alloys. During DC casting different iron bearing particles, e.g. AlmFe, Al3Fe and Al6Fe, are formed. A change of the dominating iron bearing ... -
Characterization the softening behavior of cold rolled AlMnFeSi-alloys during conditions of concurrent precipitation
Wang, Ning; Li, Yanjun; Marthinsen, Knut (Journal article, 2013)In the present work an Al-Mn-(Fe-Si) model alloy has been subjected to different homogenization treatments, to achieve materials with different microchemistry states in terms of constituents, levels of Mn in solid solution ... -
Chemical Modification of Al-Mg2Si Eutectic With Additions of Calcium and Strontium
Linga, Håkon (Master thesis, 2020)Eutektiske og legeringer nær eutektisk komposisjon er vanlege å bruke til støping på grunn av ypperlige støpeegenskaper, og ein slik legering er Al-5Mg-2Si som danner ein stor andel av den eutektiske fasen Al-Mg2Si. Sjølv ... -
Combined effect of Mg and vacancy on the generalized planar fault energy of Al
Zhao, Dongdong; Løvvik, Ole Martin; Marthinsen, Knut; Li, Yanjun (Journal article; Peer reviewed, 2017)By first-principles calculations, a systematic study has been undertaken to investigate the combined effect of vacancies and Mg impurities on the generalized planar fault energy (GPFE) of pure Al. It was predicted that ... -
The combined effect of pre-aging and Mg/Si ratio on the natural aging and bake hardening in Al-Mg-Si-0.7Cu alloys
Zang, Ruojin; Wan, Bin; Ding, Lipeng; Ehlers, Flemming J H; Jia, Zhihong; Cao, Lingfei; Li, Yanjun (Peer reviewed; Journal article, 2024)The combined influences of pre-aging treatment (PA) and changing Mg/Si ratio on the natural aging (NA) effect and bake hardening response for a series of 6000 series alloys with excess Mg and Cu content was studied. The ... -
Cu Interlayer-Induced High-Strength Laser-Welded AISI 304 Steel-Niobium Joint
Shi, Mingxiao; Li, Yanjun; Ma, Xiang (Peer reviewed; Journal article, 2019)Joining niobium to austenitic stainless steel is necessary for the fabrication of particle accelerators. However, the brittle iron-niobium intermetallics formed in the joint significantly reduce the joint strength. Copper ... -
Deflecting Dendrites by Introducing Compressive Stress in Li7La3Zr2O12 Using Ion Implantation
Flatscher, Florian; Todt, Juraj; Burghammer, Manfred; Søreide, Hanne-Sofie Marie Scisly; Porz, Lukas; Li, Yanjun; Wenner, Sigurd; Bobal, Viktor; Ganschow, Steffen; Sartory, Bernhard; Brunner, Roland; Hatzoglou, Constantinos; Keckes, Jozef; Rettenwander, Daniel (Peer reviewed; Journal article, 2023)Lithium dendrites belong to the key challenges of solid-state battery research. They are unavoidable due to the imperfect nature of surfaces containing defects of a critical size that can be filled by lithium until fracturing ... -
Deformation of an Al-7Mg alloy with extensive structural micro-segregations during dynamic plastic deformation
Jin, Shenbao; Tao, Nairong; Marthinsen, Knut; Li, Yanjun (Journal article; Peer reviewed, 2015)The microstructure evolution and deformation behavior of an as-cast Al–7Mg alloy with severe Mg segregation zones distributed on grain boundaries and in interdendrite regions subjected to dynamic plastic deformation (DPD) ... -
Developing ductile and isotropic Ti alloy with tailored composition for laser powder bed fusion
Wang, Leyun; Song, Zhe; Zhang, Xuan; Park, Jun-Sang; Almer, Jonathan; Zhu, Gaoming; Chen, Yiwen; Li, Quan; Zeng, Xiaoqin; Li, Yanjun (Peer reviewed; Journal article, 2022)Laser powder bed fusion (LPBF) is an advanced technology to create metallic components with complex geometry. Ti-6Al-4V (Ti64) is one of the most frequently used materials for LPBF. The intrinsic high cooling rates and ...