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

Zhong-wei Chen; Ming-jun Tang; Kai Zhao

doi:10.1007/s12613-014-0879-8

Volume 21 Issue 2

Feb. 2014

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International Journal of Minerals, Metallurgy and Materials > 2014 > 21(2): 155-161. > DOI: 10.1007/s12613-014-0879-8

Zhong-wei Chen, Ming-jun Tang, and Kai Zhao, Effect of rare earth samarium addition on the kinetics of precipitation in Al-Cu-Mn casting alloy, Int. J. Miner. Metall. Mater., 21(2014), No. 2, pp.155-161. https://dx.doi.org/10.1007/s12613-014-0879-8

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

Author Affilications

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, China

Funds:

the 111 Project of China(No.B08040)

This work was financially supported by the Aeronautical Science Foundation of China(No.2012ZF53080)

the Fund of the State Key Laboratory of Solidification Processing in Northwestern Polytechnical University(No.SKLSP201009)

the Shaanxi Province Science and Technology Research and Development Program of China(No.2013K08-11)

Received: 12 July 2013; Revised: 29 September 2013; Accepted: 11 October 2013; Available Online: 09 June 2021

Graphical Abstract

Abstract

Abstract

The mechanical properties of Al-Cu-Mn casting alloy mainly depend on the morphology, distribution, size, and number of θ′(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 θ′ phase were identified from the DSC curves. The activation energy of θ′ 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 θ′ 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 θ′ formation and promotes the formation of θ′ precipitates.
- aluminum copper alloys,
- rare earth additions,
- samarium,
- precipitation,
- kinetics

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