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HomeMaterials Science ForumMaterials Science Forum Vol. 1072Effects of Ce on Microstructure of As-Cast Mg-6Zn...

Effects of Ce on Microstructure of As-Cast Mg-6Zn Alloy

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Abstract:

Phase constitution and phase transition temperature are important factors to influence deformation parameters, recrystallization behavior and density of precipitates of wrought Mg-Zn-Ce alloys. In this work the microstructures and phase constitution of as-cast Mg-6Zn-xCe (x = 0.6, 1, 2) alloys were characterized by XRD, SEM, TEM and DTA. The results show that the major compounds in Mg-6Zn-0.6Ce are blocky Mg₄Zn₇ phase, laminar Mg₇Zn₃ phase and cellular T phase. All compounds are almost blocky and cellular T phase in Mg-6Zn-1Ce alloy, and all T phase transformed to block in Mg-6Zn-2Ce alloy. The onset temperatures of phase transformation of T phase are increased with increasing Ce contents due to the decrease of solid solubility of Zn in T phase. The corresponding endothermic peaks of T phase in Mg-6Zn-0.6Ce, Mg-6Zn-1Ce and Mg-6Zn-2Ce are 358 °C, 494 °C and 514 °C, respectively. The increase of content of Ce result in the decrease of the concentrations of Zn in matrix, which leads to the decrease of β₁′ precipitate density and the increase of onset temperatures of melting of matrix.

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Periodical:

Materials Science Forum (Volume 1072)

Pages:

11-19

DOI:

https://doi.org/10.4028/p-3pxjw5

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Online since:

October 2022

Authors:

Wen Peng Yang*, Jing Jing Zhou, Hong Bao Cui, Zhi Chao Xu, Ying Wang, Xue Feng Guo

Keywords:

DTA, Mg-Zn-Ce Alloy, Phase Constitution, SEM, TEM

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* - Corresponding Author

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