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Effect of cooling rates on solidification and microstructure of rapidly solidified Mg57Zn37Y6 quasicrystal alloy

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Abstract

The influence of cooling rates on the solidification and microstructure of rapidly solidified quasicrystal alloys with a nominal compositions of Mg57Zn37Y6 (at.%) prepared by melt spinning method was investigated. The microstructure, phase constitution, phase transition, and phase structure of the alloys were examined by means of scanning electron microscopy, x-ray diffraction, energy dispersive spectrometer, differential scanning calorimetry, and transmission electron microscopy. The results show that rapid solidification refines and homogenizes the microstructure of Mg57Zn37Y6 alloys, compared to the conventionally-cast master alloy. With the increasing cooling rate of rapid solidification, the thickness of the ribbon decreases greatly and a larger amount of I-phase can be formed. α-Mg, MgZn, and icosahedral phases are found in the as-cast alloy, but the MgZn phase is absent from rapidly solidified alloys. The I-phase in both as-cast and rapidly solidified alloys can precipitate directly from the melt during the solidification process. A higher cooling rate can lead to a large degree of supercooling, resulting in a decreased phase transition temperature and a large number of icosahedral short-range orders (ISROs). ISROs can act as templates in liquid and promote the nucleation of I-phase.

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ACKNOWLEDGMENTS

The financial support for this work is provided by the National Natural Science Foundation of China (No. 51571102) and the Special Joint Funds of Natural Science Foundation of Shandong Province, China (ZR2013EML004).

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Authors and Affiliations

  1. School of Materials Science and Engineering, University of Jinan, 250022, Jinan, Shandong Province, People’s Republic of China

    Min Xu & Xinying Teng

  2. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, People’s Republic of China

    Jiwei Geng

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  1. Min Xu
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Correspondence to Xinying Teng.

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Xu, M., Teng, X. & Geng, J. Effect of cooling rates on solidification and microstructure of rapidly solidified Mg57Zn37Y6 quasicrystal alloy. Journal of Materials Research 30, 3324–3330 (2015). https://doi.org/10.1557/jmr.2015.283

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