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Semisolid microstructural evolution of (CNTs + Sip)/AZ91D powder compacts prepared from powders by cold pressing and remelting

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Abstract

The evolution of semisolid microstructure during partial remelting of (CNTs + Sip)/AZ91D powder compacts prepared by cold pressing was studied. The results indicate that rapid grain coarsening is driven by the dissolution of eutectic β phase material during the initial heating period of 0–10 min, so the AZ91D powders with fine equiaxed grains surrounded by intergranular eutectic phases evolve into compact particles. As the heating time proceeds, α-Mg particles were gradually separated by liquid due to the phase transformations of α-Mg + β → L and α-Mg → L. The primary particles coarsened rather slowly and the as-received Mg powder evolved into nearly spheroidal particles surrounded by liquid phase after partial remelting. The in situ synthesized Mg2Sip were distributed homogeneously around the CNTs with maintained structural integrity during partial remelting. Moreover, this microstructural evolution was accompanied by densification through pore filling. An ideal semisolid ingot suitable for thixoforming can therefore be obtained by partially remelting a (CNTs + Sip)/Mg powder compact.

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Acknowledgements

This study was financially supported by the Ningxia Natural Science Foundation of China (No. 2018AAC03031), the Basic Scientific Fund of Ningxia university (No. NGY2018009), and the Natural Science Foundation of Ningxia University (No. ZR1702).

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Authors and Affiliations

  1. Ningxia Key Laboratory of Photovoltaic Materials, Ningxia University, Yinchuan, 750021, China

    Pu-Bo Li, Wan-Ting Tan, Mang-Mang Gao & Kuan-Guan Liu

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  1. Pu-Bo Li
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  2. Wan-Ting Tan
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  3. Mang-Mang Gao
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  4. Kuan-Guan Liu
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Correspondence to Pu-Bo Li.

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Li, PB., Tan, WT., Gao, MM. et al. Semisolid microstructural evolution of (CNTs + Sip)/AZ91D powder compacts prepared from powders by cold pressing and remelting. Rare Met. 39, 733–742 (2020). https://doi.org/10.1007/s12598-020-01396-3

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  • DOI: https://doi.org/10.1007/s12598-020-01396-3

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