Yunnan, China
Yunnan, China

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Duan Y.H.,Kunming University of Science and Technology | Sun Y.,Kunming University of Science and Technology | Lu L.,Yunnan Aluminum Co.
Computational Materials Science | Year: 2013

First principles calculations have been carried out to investigate the thermodynamic properties and thermal conductivities of L12-TiAl 3, L12-Ti(AlPt)3 and D022-TiAl 3. The obtained enthalpy of formation and Debye temperature are in good agreement with the available experiment data and other theoretical results. The thermal conductivities of L12-TiAl3, L1 2-Ti(AlPt)3 and D022-TiAl3 were evaluated. The calculated thermal conductivity of D022-TiAl 3 possesses the highest value of 1.15 W m-1 K-1 in these TiAl3-type intermetallics in Al-Pt-Ti system. © 2012 Elsevier B.V. All rights reserved.


Jia R.,Kunming University of Science and Technology | Yan J.,Kunming University of Science and Technology | Qiu Z.,Yunnan Aluminum Co. | Wu P.,Yunnan Aluminum Co. | And 4 more authors.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2013

The temperature field in the solidification process of sand mold casting electro-mobile aluminum alloy wheels was simulated. The mathematical model, geometrical model and FEM model of temperature field were established. The nonlinear features of materials and boundary conditions have been fully considered and the latent heat was treated by using equivalent specific heat method. The temperature fields in solidification process of sand gravity casting aluminum alloy wheels were simulated by FEM simulation Procast, and temperature field distribution was presented. The results show that the numerical simulation can describe well dynamic changes of three dimensional temperature field and provide a reference to improve aluminum alloy wheels quality, determination of solidification time and process optimitation.


Duan Y.-H.,Kunming University of Science and Technology | Sun Y.,Kunming University of Science and Technology | Lu L.,Yunnan Aluminum Co.
Gongneng Cailiao/Journal of Functional Materials | Year: 2013

Based on the first-principles density functional theory (DFT), the electronic structures and optical properties of cubic L12-TiAl3 and L12-Ti (Al, Pt)3 and tetragonal D022-TiAl3 are calculated by using the generalized gradient approximation (GGA) and plane wave pseudopotential method. The calculation results show that the valence and conduction bands of L12-TiAl3 and D022-TiAl3 near the Fermi energy of are composed of Ti 3d and Al 3p orbits while Ti 3d and Pt 6s orbits for L12-Ti(Al, Pt)3; the dielectric functions, refractive indexes, absorption coefficients and reflectivity of L12-TiAl3, L12-Ti (Al, Pt)3 and D022-TiAl3 are calculated, respectively.


Dai Q.,Central South University | Deng Y.,Central South University | Xu F.,Central South University | Xu F.,Yunnan Aluminum Co. | Zhang X.,Central South University
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2015

In view of the inferior liquidity of 3004 aluminum alloy melt in cast-rolling, difficult to distribute in feed tip nozzle and easy to cause defect of sheet, viscosity of 3004 aluminum alloy melt was measured by viscometer for high temperature melt, fluid-thermal field of melt in nozzle cavity was analyzed by finite element simulation analysis software (COMSOL Multiphysics) based on the actual physical parameters and production condition, and nozzle structure was optimized according to the simulation results and it was verified by experiment. The results show that the relationship between viscosity μ and temperature θ from 660℃ to 750℃ can be expressed as μ =10-3× exp (0.059+621.379/θ). The vortex emerges in nozzle cavity and fluid-thermal field distributes unevenly at the output of nozzle when the angle is 8° between block and horizontal direction and the gap is 30 mm between block and spacers. While melts flow smoothly and fluid-thermal field is relatively uniform when the block is horizontal and the gap is 50 mm. The experiments show that the optimum proposal is feasible and the simulation results are accurate. ©, 2015, Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology). All right reserved.


Ding J.-L.,Central South University | Ding J.-L.,Yunnan Aluminum Co. | Zhang H.-L.,Central South University | Liu Y.-Q.,Yunnan Aluminum Co. | Zhang D.-X.,Yunnan Aluminum Co.
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2011

Taking cell liner design as the breakthrough point, a new type cell of bend surface cathode structure was developed and the working stability of this new cell under low polar distance condition was studied. The results show that the new structure cell can efficiently reduce direct current consumption to 12331 kW·h, stabilize electrolysis production and extend the cell life.

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