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Microstructure and mechanical properties of Mg–4Zn–xY alloys prepared by hot-extrusion

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Abstract

To investigate the effect of Y element and hot-extrusion on microstructure and mechanical properties of the three alloys which are Mg–4Zn–xY (x = 1, 2, 3 in wt%). All the three alloys are hot-extruded and analyzed. The results show that as Y is increased, the microstructures of the as-cast alloys are more refined and the phase compositions are changed from both I-phase and W-phase to single W-phase whose structure is changed from mix of net and spheroidization to continuous net. The mechanical properties are increased to a small extent mainly due to the refining effect of Y. After hot-extrusion, coarse dendrite crystals are broken and dynamic recrystallization appears which obviously refine the microstructure. Second phases are redistributed along the extrusion direction. W-phases are twisted and broken, while I-phases are spheroidized. Tensile strengths and elongations are all increased by around 100% compared with the as-cast alloys.

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ACKNOWLEDGMENT

Thanks for Liaoning Province Science and Technology Plan (No. 2013201018) for funding supporting the research.

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  1. School of Material Science and Engineering, Shenyang University of Technology, Shenyang, Liaoning, 110870, China

    Jibao Li, Feng Wang, Pingli Mao & Zheng Liu

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  1. Jibao Li
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  2. Feng Wang
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Correspondence to Feng Wang.

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Li, J., Wang, F., Mao, P. et al. Microstructure and mechanical properties of Mg–4Zn–xY alloys prepared by hot-extrusion. Journal of Materials Research 30, 1965–1972 (2015). https://doi.org/10.1557/jmr.2015.146

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  • DOI: https://doi.org/10.1557/jmr.2015.146

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