A self-developed double-nozzle gas atomization technique was used to produce AlSi10Mg powder.Effects of delivery tube diameter,gas pressure,and melt superheat on powder characteristics were investigated.The concepts o...A self-developed double-nozzle gas atomization technique was used to produce AlSi10Mg powder.Effects of delivery tube diameter,gas pressure,and melt superheat on powder characteristics were investigated.The concepts of bluntness and outgrowth were introduced to analyze powder sphericity and satellite index quantitatively.The results showed that the median diameters of all atomized powders ranged from 25 to 33μm.The highest yield rate(72.13%)of fine powder(<50μm)was obtained at a superheat of 350 K.The powder size decreased with increasing melt superheat but increased with increasing delivery tube diameter.Powders with bluntness values between 96%and 98%accounted for over 60%.The outgrowth values demonstrated that 70%-85%of all powders did not contain satellite particles,with few powders adhered two or three particles.Not only Al and Si phases were present but also a metastable Al9Si phase was detected.展开更多
High-level ab initio calculations of theΛ-S states for aluminum monoiodide(AlCl)molecule are performed by utilizing the explicitly correlated multireference configuration interaction(MRCI-F12)method.The Davidson corr...High-level ab initio calculations of theΛ-S states for aluminum monoiodide(AlCl)molecule are performed by utilizing the explicitly correlated multireference configuration interaction(MRCI-F12)method.The Davidson correction and scalar relativistic correction are investigated in the calculations.Based on the calculation by the MRCI-F12 method,the spin-orbit coupling(SOC)effect is investigated with the state-interacting technique.The adiabatic potential energy curves(PECs)of the 13Λ-S states and 24Ωstates are calculated.The spectroscopic constants of bound states are determined,which are in accordance with the results of the available experimental and theoretical studies.Finally,the transition properties of 0^(+)(2)-X0^(+),1(1)-X0^(+),and 1(2)-X0^(+)transitions are predicted,including the transition dipole moments(TDMs),Franck-Condon factors(FCFs),and the spontaneous radiative lifetimes.展开更多
基金Project(51627805) supported by the National Natural Science Foundation of ChinaProject(2015A030312003) supported by the Natural Science Foundation of Guangdong Province,China+1 种基金Projects(2014B010129003,2015B020238008,2016B090931006,2017B090901025) supported by the Science and Technology Research Department of Guangdong Province,ChinaProject(201604016049) supported by the Science and Technology Bureau of Guangzhou City,China
文摘A self-developed double-nozzle gas atomization technique was used to produce AlSi10Mg powder.Effects of delivery tube diameter,gas pressure,and melt superheat on powder characteristics were investigated.The concepts of bluntness and outgrowth were introduced to analyze powder sphericity and satellite index quantitatively.The results showed that the median diameters of all atomized powders ranged from 25 to 33μm.The highest yield rate(72.13%)of fine powder(<50μm)was obtained at a superheat of 350 K.The powder size decreased with increasing melt superheat but increased with increasing delivery tube diameter.Powders with bluntness values between 96%and 98%accounted for over 60%.The outgrowth values demonstrated that 70%-85%of all powders did not contain satellite particles,with few powders adhered two or three particles.Not only Al and Si phases were present but also a metastable Al9Si phase was detected.
基金the National Key Research and Development Program of China(Grant No.2017YFA0403300)the National Natural Science Foundation of China(Grant Nos.11874177,11874179,and 11574114)+1 种基金the Natural Science Foundation of Jilin Province,China(Grant No.20180101289JC)the High Performance Computing Center of Jilin University and High Performance Computing Cluster Tiger@IAMP(Theoretical Simulation Laboratory of Generalized Atomic,Molecular,and Energy Researches at Institute of Atomic and Molecular Physics).
文摘High-level ab initio calculations of theΛ-S states for aluminum monoiodide(AlCl)molecule are performed by utilizing the explicitly correlated multireference configuration interaction(MRCI-F12)method.The Davidson correction and scalar relativistic correction are investigated in the calculations.Based on the calculation by the MRCI-F12 method,the spin-orbit coupling(SOC)effect is investigated with the state-interacting technique.The adiabatic potential energy curves(PECs)of the 13Λ-S states and 24Ωstates are calculated.The spectroscopic constants of bound states are determined,which are in accordance with the results of the available experimental and theoretical studies.Finally,the transition properties of 0^(+)(2)-X0^(+),1(1)-X0^(+),and 1(2)-X0^(+)transitions are predicted,including the transition dipole moments(TDMs),Franck-Condon factors(FCFs),and the spontaneous radiative lifetimes.
