Blar i NTNU Open på forfatter "Li, Yanjun"
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Effect of soft Bi particles on grain refinement during severe plastic deformation
Jia, Hailong; Marthinsen, Knut; Li, Yanjun (Journal article; Peer reviewed, 2017)Two aluminum alloys, Al–8Zn and Al–6Bi–8Zn were subjected to equal channel angular pressing (ECAP) up to 5 passes at room temperature. The microstructural evolution and the grain refinement behavior of these alloys were ... -
Effect of Surface Treatment and Preheating Temperature on Compound Casting of Aluminium Alloy A356 onto 6060 Inserts
Grasmo, Siren (Master thesis, 2019)For bilindustrien er det viktig å studere ulike metoder for å redusere kjøretøyvekt, da dette reduserer bensinforbruk, noe som vil ha både økonomiske og miljømessige fordeler. Hybridstøpning er å støpe et flytende materiale ... -
Effects of Surface Treatment on Hypoeutectoid Steels and Commercially Pure Copper in a Compound Casting Process with Aluminum A356 Alloy
Bakke, Aina Opsal (Master thesis, 2017)Evidence of climate change has caused industries worldwide to start measures towards reducing greenhouse gas emission. The automotive industry is a large contributor to emission and has therefore demanded production of ... -
Engineering grain boundary structures of aluminium alloys and titanium by high strain/ strain rate deformation
Jia, Hailong (Doctoral theses at NTNU;2018:139, Doctoral thesis, 2018)A comprehensive study was carried out to clarify the effects of severe plastic deformation (SPD) and high strain rate deformation on various aluminium alloys and commercial purity titanium. Equal channel angular pressing ... -
Enhanced dispersoid precipitation and dispersion strengthening in an Al alloy by microalloying with Cd
Qian, Feng; Jin, Shenbao; Sha, Gang; Li, Yanjun (Journal article; Peer reviewed, 2018)The dispersion hardening effect of Mn(Fe)-containing dispersoids in aluminium alloys has long been ignored since it is difficult to achieve a high number density of fine dispersoids with conventional alloying compositions. ... -
Enhanced nucleation and precipitation hardening in Al-Mg-Si(-Cu) alloys with minor Cd additions
Qian, Feng; Zhao, Dongdong; Mørtsell, Eva Anne; Jin, Shenbao; Marioara, Calin Daniel; Andersen, Sigmund Jarle; Sha, Gang; Li, Yanjun (Peer reviewed; Journal article, 2020)This work reports a novel effect of impurity element Cd on enhancing the precipitation kinetics and increasing the peak hardness of Al–Mg–Si(–Cu) alloys during artificial ageing. It is found that the number density of age ... -
Evolution in microstructure and properties during non-isothermal annealing of a cold-rolled Al-Mn-Fe-Si alloy with different microchemistry states
Huang, Ke; Engler, Olaf; Li, Yanjun; Marthinsen, Knut (Journal article, 2015)The softening behaviour during non-isothermal annealing of a cold-rolled Al–Mn–Fe–Si model alloy was studied as a function of the state of microchemistry, in terms of the solute level of Mn, size and spatial distribution ... -
Experimental and numerical modelling study on the nucleation and grain growth of inoculated aluminium alloys
Xu, Yijiang (Doctoral theses at NTNU;2017:343, Doctoral thesis, 2017)With the aim to achieve an in-depth understanding on the heterogeneous nucleation and grain growth behavior during solidification of inoculated aluminum alloys, an integrated study by in-situ X-radiography, numerical ... -
Faceted interfacial structure of {1011} twins in Ti formed during equal channel angular pressing
Li, Yanjun; Chen, Yongjun; Walmsley, John C.; Mathiesen, Ragnvald; Dumoulin, S; Roven, Hans Jørgen (Journal article; Peer reviewed, 2010)The boundary structure of {1011} deformation twins formed in commercial pure titanium (CP-Ti) during the initial pass ECAP processing has been studied by TEM and HRTEM. A new twining mode with twinning dislocation of b3/3, ... -
Facile fabrication of ultrathin freestanding nanoporous Cu and Cu-Ag films with high SERS sensitivity by dealloying Mg-Cu(Ag)-Gd metallic glasses
Zhao, Yuan-Yun; Qian, Feng; Zhao, Chengliang; Xie, Chunxiao; Wang, Jianguo; Chang, Chuntao; Li, Yanjun; Zhang, Lai-Chang (Peer reviewed; Journal article, 2021)Nanoporous metals prepared by dealloying have attracted increasing attention due to their interesting size-dependent physical, chemical, and biological properties. However, facile fabrication of metallic ultrathin freestanding ... -
Facile synthesis of metal and alloy nanoparticles by ultrasound-assisted dealloying of metallic glasses
Zhao, Yuanyun; Qian, Feng; Li, Yanjun; Shen, Wenfeng; Zhao, Chengliang; Wang, Jianguo; Xie, Chunxiao; Zhou, Fengling; Chang, Chuntao (Peer reviewed; Journal article, 2021)Metal and alloy nanoparticles synthesized by chemical reduction have attracted increasing attention due to their superior physical, chemical, and biological properties. However, most chemical synthesis processes rely on ... -
Formation and evolution of the interfacial structure in Al/steel compound castings during solidification and heat treatment
Bakke, Aina Opsal; Arnberg, Lars; Løland, Jan-Ove; Jørgensen, Svein; Kvinge, Jan; Li, Yanjun (Peer reviewed; Journal article, 2020)In this work, Al7SiMg/steel compound castings were produced through a low-pressure die casting process. All steel inserts were galvanized, where half of them were flux-coated to further improve the wettability and remove ... -
Formation of incoherent deformation twin boundaries in a coarse-grained Al-7Mg alloy
Jin, Shenbao; Zhang, Kai; Bjørge, Ruben; Tao, NR; Marthinsen, Knut; Lu, K; Li, Yanjun (Journal article; Peer reviewed, 2015)Deformation twinning has rarely been observed in coarse grained Al and its alloys except under some extreme conditions such as ultrahigh deformation strain or strain rates. Here, we report that a significant amount of Σ3 ... -
Formation of Primary Silicon and its Influence on the Eutectic Solidification in Unmodified Hypoeutectic Al-Si Alloys - Investigation of Orientation Relationships by EBSD
Hendawi, Rania (Master thesis, 2018)Nucleation and growth of the primary and eutectic silicon in unmodified hypoeutectic Al-Si alloy have been investigated for via optical microscopy, EBSD and SEM . The influence of the cooling rate and phosphorus concentration ... -
Formation of {11-21} twin boundaries in titanium by kinking mechanism through accumulative dislocation slip
Jin, Shenbao; Marthinsen, Knut; Li, Yanjun (Journal article; Peer reviewed, 2016)The twinning behavior and kinking behavior of a commercial purity Ti subjected to room temperature dynamic plastic deformation (DPD) has been studied. Three types of deformation twins, {1012}, {1122} and {1121}, have been ... -
Formation of Σ3{110} incoherent twin boundaries through geometrically necessary boundaries in an Al-8Zn alloy subjected to one pass of equal channel angular pressing
Jia, Hailong; Jin, Shenbao; Li, Yanjun (Journal article, 2018)For coarse grained (CG) alloys with high stacking fault energies (SFEs), like aluminum, deformation twins can rarely form. Here, we report that Σ3{110} incoherent twin boundaries (ITBs) could be generated in a CG Al-8Zn ... -
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 (Journal article; Peer reviewed, 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 (Journal article; Peer reviewed, 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 ... -
Hierarchical structure in Al-Cu alloys to promote strength/ductility synergy
Wu, Shenghua; Li, Yanjun; Roven, Hans Jørgen; Liu, gang; Sun, Jun (Peer reviewed; Journal article, 2021)Experimental evidence demonstrated that equal channel angular pressing (ECAP) at cryogenic temperature, in comparison with ECAP at room temperature, led to promoted strength-ductility synergy in an Al-2.5wt.%Cu alloy. The ... -
High strength and ductile high solid solution Al-Mg alloy processed by a novel hard-plate rolling route
Zha, Min; Meng, Xiaotao; Zhang, Hongmin; zhang, Xuanhe; Jia, Hailong; Li, Yanjun; Zhang, Junyu; Wang, Huiyuan; Jiang, Qichuan (Journal article, 2017)Achieving bimodal grain structure via cold rolling remains a challenge for Al–Mg alloys. In the present work, a high tensile strength (∼525 MPa) and ductile (∼14%) Al–9Mg alloy was fabricated by a novel hard-plate rolling ...