| Microstructures and evolution mechanism of highly undercooled Ni-Pb hypermonotectic alloy |
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| 作者姓名： | 谢辉 杨根仓 郝维新 樊建锋 朱耀产 许丽君 |
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| 作者单位： | [1]SchoolofMetallurgicalScienceandEngineering,CenterSouthUniversity,Changsha410083,China [3]StateKeyLaboratoryofSolidificationProcessing,NorthwesternPolytechnicalUniversity,Xi＇an710072,China |
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| 基金项目： | 国家自然科学基金，航空科研项目，陕西省自然科学基金，the Doctorate Creation Foundation of NWPU |
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| 摘 要： | The microstructures and evolution mechanism of the undercooled Ni-20%Pb(molar fraction) alloy were investigated systematically by high undercooling solidification technique. The experiment results indicate that the morphology of α-Ni phase and the distribution of Pb element in undercooled Ni-20% Pb alloys change with the in-crease of undercooling. The main evolution mechanisms of α-Ni are dendrite remelting and recrystallization. Pb phase in the microstructure of Ni-20% Pb hypermonotectic alloy originates from L2 phase separated from the parent melt during the cooling process through immiscible gap and L2 phase formed at the temperature of monotectic trans-formation. The solubility of Ph element in α-Ni phase under high undercooling condition is up to 5.83% which is ob-viously higher than that under equilibrium solidification condition. The real reason that causes the solubility difference is distinct solute trapping.
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| 关 键 词： | 显微结构 演变机制 镍合金 Ni-Pb过偏晶合金 过冷度 重熔 凝固 |
Microstructures and evolution mechanism of highly undercooled Ni-Pb hypermonotectic alloy |
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| XIE Hui,YANG Gen-cang,HAO Wei-xin,FAN Jian-feng,ZHU Yao-chan,XU Li-jun.Microstructures and evolution mechanism of highly undercooled Ni-Pb hypermonotectic alloy[J].Transactions of Nonferrous Metals Society of China,2004,14(3):417-418. |
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| Authors: | XIE Hui YANG Gen-cang HAO Wei-xin FAN Jian-feng ZHU Yao-chan XU Li-jun |
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| Abstract: | The microstructures and evolution mechanism of the undercooled Ni-20% Pb(molar fraction) alloy were investigated systematically by high undercooling solidification technique. The experiment results indicate that the morphology of α-Ni phase and the distribution of Pb element in undercooled Ni-20%Pb alloys change with the increase of undercooling. The main evolution mechanisms of α-Ni are dendrite remelting and recrystallization. Pb phase in the microstructure of Ni-20%Pb hypermonotectic alloy originates from L2 phase separated from the parent melt during the cooling process through immiscible gap and L′2 phase formed at the temperature of monotectic transformation. The solubility of Pb element in α-Ni phase under high undercooling condition is up to 5.83 % which is obviously higher than that under equilibrium solidification condition. The real reason that causes the solubility difference is distinct solute trapping. |
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| Keywords: | high undercooling Ni-Pb hypermonotectic alloy structural evolution dendrites remelting recrystal lization |
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