In this paper, the phase diagram of the DyCl_3-NaCl system is optimized and calculated with CALPHAD (calculation of phase diagram) technology. A set of thermodynamic functions of compounds Na_3DyCl_6, NaDyCl_4, and Na...In this paper, the phase diagram of the DyCl_3-NaCl system is optimized and calculated with CALPHAD (calculation of phase diagram) technology. A set of thermodynamic functions of compounds Na_3DyCl_6, NaDyCl_4, and NaDy_2Cl_7 have been optimized and calculated based on an interactive computer-assisted analysis. The optimized thermodynamic parameters, calculated phase diagram and experimental phase diagram are thermodynamically self-consistent.展开更多
Multiple regression equations of liquidus temperature, electrical conductivity and bath density of the Na_3AlF_6-AlF_3-BaC1_2-NaCl system were obtained from experiments by using orthogonal regression method. The exper...Multiple regression equations of liquidus temperature, electrical conductivity and bath density of the Na_3AlF_6-AlF_3-BaC1_2-NaCl system were obtained from experiments by using orthogonal regression method. The experiments were carried out in 100A cell with low melting point electrolyte, the influences of cathodic current density, electrolytic temperature, density differences of bath and liquid aluminum on current efficiency (CE) were studied; when the electrolyte cryolite ratio was 2.5, w(BaC1_2) and w(NaCl) were 48% and 10%, respectively, CE reached 90% and specific energy consumption was 10.97k Wb/kg/kg. Because of the fact that aluminum metal obtained floated on the surface of molten electrolyte, this electrolysis method was then defined as low temperature aluminum floating electrolysis. The results showed that the new low temperature aluminum electrolysis process in the Na_3AlF_6-AlF_3-BaC1_2-NaCl bath system was practical and promising.展开更多
Effects of ErCl3 addition on mechanical properties, microstructure, fractography of AZ91 magnesium alloy were studied. The results show that the ErCl3 addition in AZ91 magnesium alloy has the characteristics of igniti...Effects of ErCl3 addition on mechanical properties, microstructure, fractography of AZ91 magnesium alloy were studied. The results show that the ErCl3 addition in AZ91 magnesium alloy has the characteristics of ignition-proof and purification, and also improves the tensile strength σb and elongation δ. Due to the addition of 1.8% ErCl3, the σb and δ can be improved from 156 MPa and 1.8% to 220 MPa and 4.1% respectively, that is, σb and δ can be increased by 41% and 128%, respectively. When increasing the content of ErCl3 further, Al7ErMn5 phase forms, bulky inclusion appears, which leads to the decrease of mechanical properties of the alloy. The tensile fracture mechanism is also traverse grain and quasi-cleavage fracture, which is not changed by ErCl3 addition.展开更多
文摘In this paper, the phase diagram of the DyCl_3-NaCl system is optimized and calculated with CALPHAD (calculation of phase diagram) technology. A set of thermodynamic functions of compounds Na_3DyCl_6, NaDyCl_4, and NaDy_2Cl_7 have been optimized and calculated based on an interactive computer-assisted analysis. The optimized thermodynamic parameters, calculated phase diagram and experimental phase diagram are thermodynamically self-consistent.
基金The project was financially supported by the National Natural Science Foundation of China! (Gmnt No.59574018)China Postdocto
文摘Multiple regression equations of liquidus temperature, electrical conductivity and bath density of the Na_3AlF_6-AlF_3-BaC1_2-NaCl system were obtained from experiments by using orthogonal regression method. The experiments were carried out in 100A cell with low melting point electrolyte, the influences of cathodic current density, electrolytic temperature, density differences of bath and liquid aluminum on current efficiency (CE) were studied; when the electrolyte cryolite ratio was 2.5, w(BaC1_2) and w(NaCl) were 48% and 10%, respectively, CE reached 90% and specific energy consumption was 10.97k Wb/kg/kg. Because of the fact that aluminum metal obtained floated on the surface of molten electrolyte, this electrolysis method was then defined as low temperature aluminum floating electrolysis. The results showed that the new low temperature aluminum electrolysis process in the Na_3AlF_6-AlF_3-BaC1_2-NaCl bath system was practical and promising.
文摘Effects of ErCl3 addition on mechanical properties, microstructure, fractography of AZ91 magnesium alloy were studied. The results show that the ErCl3 addition in AZ91 magnesium alloy has the characteristics of ignition-proof and purification, and also improves the tensile strength σb and elongation δ. Due to the addition of 1.8% ErCl3, the σb and δ can be improved from 156 MPa and 1.8% to 220 MPa and 4.1% respectively, that is, σb and δ can be increased by 41% and 128%, respectively. When increasing the content of ErCl3 further, Al7ErMn5 phase forms, bulky inclusion appears, which leads to the decrease of mechanical properties of the alloy. The tensile fracture mechanism is also traverse grain and quasi-cleavage fracture, which is not changed by ErCl3 addition.
