Browsing NTNU Open by Author "Xu, Yijiang"
Now showing items 1-14 of 14
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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 ... -
Development of aluminium alloys with superior properties for additive manufacturing
Hanssen, Herman (Master thesis, 2022)Selektiv laser smelting og andre pulverbaserte 3D-printing-metoder kan produsere komponenter med høy geometrisk kompleksitet og med suverene fysiske egenskaper. Den høye avkjølingshastigheten fører til en finkornet struktur ... -
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 (Journal article; Peer reviewed, 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 ... -
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 ... -
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 ... -
In-situ X-radiographic study of nucleation and growth behaviour of primary silicon particles during solidification of a hypereutectic Al-Si alloy
Xu, Yijiang; Deng, Yun; Casari, Daniele; Mathiesen, Ragnvald; Li, Yanjun (Peer reviewed; Journal article, 2020)Real-time observation of structure evolution in a hypereutectic Al-Si(-Cu) alloy under near-isothermal melt solidification condition was conducted by using in-situ micro-focus X-radiography. The nucleation, growth rate and ... -
Modelling the Age-Hardening Precipitation by a Revised Langer and Schwartz Approach with Log-Normal Size Distribution
Zhao, Dongdong; Xu, Yijiang; Gouttebroze, Sylvain; Friis, Jesper; Li, Yanjun (Peer reviewed; Journal article, 2020)A new numerical modelling approach integrating the Langer and Schwartz approach and log-normal particle size distribution has been developed to depict the precipitation kinetics of age-hardening precipitates in Al alloys. ... -
Modelling the Spatial Evolution of Excess Vacancies and its Influence on Age Hardening Behaviors in Multicomponent Aluminium Alloys
Wang, Xuezhou; Zhao, Dongdong; Xu, Yijiang; Li, Yanjun (Peer reviewed; Journal article, 2023)Excess vacancies play crucial roles in the precipitation of age-hardening precipitates in aluminium alloys, but their spatial evolution across grains during heat treatments is less known. In this work, a numerical model ... -
Nanoparticle additions promote outstanding fracture toughness and fatigue strength in a cast Al–Cu alloy
Yang, Chenglin; Zhao, Qinglong; Zhang, Zhenjun; Li, Linlin; Tian, Weisi; Liu, Rui; Zhang, Peng; Xu, Yijiang; Li, Yanjun; Zhang, Zhefeng; Jiang, Qichuan; Ritchie, Robert (Peer reviewed; Journal article, 2020)Fatigue resistance and fracture toughness are essential to the reliability of castings during service. Reducing microporosity in cast alloys is a crucial issue for improving their fatigue strength and fracture toughness. ... -
P removal from Si by Si-Ca-Al alloying-leaching refining: Effect of Al and the CaAl2Si2 phase
Zhu, Mengyi; Yue, Shengying; Wu, Guixuan; Tang, Kai; Xu, Yijiang; Safarian, Jafar (Peer reviewed; Journal article, 2021)Phosphorus (P) is a critical impurity in metallurgical-grade Si that needed to be removed for solar-grade Si production. The Si-Ca-Al-P system is one of the most crucial alloy systems for Si refining, where P can be separated ... -
Parameter Optimization of Mini 3D Printer for Additive Manufacturing of Hypereutectic Aluminum Silicon Alloys
Skar, Harald (Master thesis, 2023)Denne oppgaven vil undersøke det stadig voksende feltet med additive produksjonsmetoder (AM) som brukes i produksjonen av komplekse tredimensjonale metallkomponenter. Det har spesielt vært en økning i interessen fra ulike ... -
Revealing the Heterogeneous Nucleation and Growth Behaviour of Grains in Inoculated Aluminium Alloys During Solidification
Xu, Yijiang; Casari, Daniele; Mathiesen, Ragnvald; Li, Yanjun (Peer reviewed; Journal article, 2019)An in situ X-ray radiographic study on the grain nucleation and grain growth of inoculated Al–10Cu and Al–20Cu alloys during isothermal melt solidification and directional solidification conditions with constant cooling ... -
Revealing the heterogeneous nucleation behavior of equiaxed grains of inoculated Al alloys during directional solidification
Xu, Yijiang; Casari, Daniele; Mathiesen, Ragnvald; Li, Yanjun (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 ... -
Understanding the inoculation of aluminium grains during welding under the influences of high cooling rate and high temperature gradient
Xu, Yijiang; Langelandsvik, Geir; Bunaziv, Ivan; Li, Yanjun (Peer reviewed; Journal article, 2023)Inoculation is an important method to generate fine equiaxed grain structures in alloys during solidification, which is widely used in shape casting and direct chill casting processes of aluminium alloys. Different from ...