Effect of rare earth samarium addition on the kinetics of precipitation in Al-Cu-Mn casting alloy

被引：22
|
作者：
Chen, Zhong-wei [1 ]
Tang, Ming-jun [1 ]
Zhao, Kai [1 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
来源：
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS | 2014年 / 21卷 / 02期
关键词：
aluminum copper alloys; rare earth additions; samarium; precipitation; kinetics; TRANSFORMATION KINETICS; MECHANICAL-PROPERTIES; DISSOLUTION KINETICS; FRACTURE-BEHAVIOR; PHASE; MICROSTRUCTURES; CRYSTALLIZATION; RATES; DSC; TEM;
D O I：
10.1007/s12613-014-0879-8
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The mechanical properties of Al-Cu-Mn casting alloy mainly depend on the morphology, distribution, size, and number of theta'(Al2Cu) precipitates. In this study, we have analyzed the effect of rare earth samarium (Sm) addition on the kinetics of precipitation in the Al-Cu-Mn casting alloy by using differential scanning calorimetry (DSC) and high-resolution transmission electron microscopy. Thermal effect peaks that are attributed to the formation and the dissolution of Guinier-Preston (GP) zone and theta' phase were identified from the DSC curves. The activation energy of theta' formation was calculated by using both the Kissinger method and the analytical model, and the corresponding results were compared. Results suggest that the activation energy of theta' formation in Al-Cu-Mn alloy is dramatically higher than that in Al-Cu-Mn-Sm alloy. Accordingly, it is concluded that the addition of rare earth Sm decreases the activation energy of theta' formation and promotes the formation of theta' precipitates.
引用
收藏
页码：155 / 161
页数：7
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