Modification Behavior of Trace Rare Earth on Impurity Phases in Commercial Purity Aluminum
来源期刊：JOURNAL OF RARE EARTHS2002年第1期
论文作者：孙锋山 傅高升 任立英 陈文哲 钱匡武
Key words：rare earths; commercial purity aluminum; Fe-rich impurity phases; modification of impurity phases;
Abstract: Modifying effect and mechanism of trace rare earth on Fe(Si)-rich impurity phases in commercial purity aluminum were studied with the aids of SEM, EDAX, TEM, etc. It is found that Ce-rich mixed rare earth (RE) is an effective modifying agent, which makes the coarse Fe-rich impurity phases transform into complex compounds of tiny, sphere/short stick form, thus improving mechanical properties of this material; its modifying mechanism is in that RE gathering in front of solid/liquid interface enters into the impurity phases, forming complex (AlFeSiRE) compounds; or is adsorbed in the impurity phases surface, impeding the growth of impurity phases; however, excessive RE will result in the increasing of RE compounds (secondary phases), and plasticity reduction of this material. Therefore, its addition amount should be less than 0.07% (mass fraction).
孙锋山1，傅高升1，任立英2，陈文哲2，钱匡武2
(1.Department of Mechanical Engineering;
2.College of Materials Science and Engineering, Fuzhou University, Fuzhou 350002， China)
Abstract:Modifying effect and mechanism of trace rare earth on Fe(Si)-rich impurity phases in commercial purity aluminum were studied with the aids of SEM, EDAX, TEM, etc. It is found that Ce-rich mixed rare earth (RE) is an effective modifying agent, which makes the coarse Fe-rich impurity phases transform into complex compounds of tiny, sphere/short stick form, thus improving mechanical properties of this material; its modifying mechanism is in that RE gathering in front of solid/liquid interface enters into the impurity phases, forming complex (AlFeSiRE) compounds; or is adsorbed in the impurity phases surface, impeding the growth of impurity phases; however, excessive RE will result in the increasing of RE compounds (secondary phases), and plasticity reduction of this material. Therefore, its addition amount should be less than 0.07% (mass fraction).
Key words:rare earths; commercial purity aluminum; Fe-rich impurity phases; modification of impurity phases;
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