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Distribution uniformity of added elements in twin-roll cast Al–Zn–Mg–Cu alloy by multi-electromagnetic fields

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Abstract

The micromorphology and the concentration of massive precipitates produced by twin-roll casting (TRC) processes without and with multi-electromagnetic fields for Al–Zn–Mg–Cu alloy at 670 °C were investigated in detail by means of optical microscopy (OM) and electron probe micro analyzer (EPMA). The results clearly show that under a 0.2 T static magnetic field, the macro-segregation bands are remarkably alleviated according to the order of uniform static magnetic field, half-wave oscillating electromagnetic field as well as alternating oscillating electromagnetic field, as compared with the non-field TRC process (B = 0). Moreover, under the alternating oscillating electromagnetic TRC process, almost all segregation bands disappear. Additionally, through the observation on a smaller scale, the netlike precipitates elongated and broken by electromagnetic force, and replaced by numerous bulk depositions. EPMA analysis shows that the added atoms are diffused from deposition to α (Al) matrix, resulting in that the solute concentration in and around the precipitates is tending toward uniformity and stability.

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Acknowledgments

The work was financially supported by the National Basic Research Program of China (No.2013CB632203).

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Authors and Affiliations

  1. School of Materials and Metallurgy, Northeastern University, Shenyang, 110819, China

    Xin Su & Guang-Ming Xu

  2. Key Laboratory of Ministry of Education for Electromagnetic Processing of Materials, Shenyang, 110819, China

    Xin Su & Guang-Ming Xu

  3. Guangdong Donggong Information Science & Technology Company Limited, Foshan, 510000, China

    Ding-Hui Jiang

Authors
  1. Xin Su
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  2. Guang-Ming Xu
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Correspondence to Guang-Ming Xu.

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Su, X., Xu, GM. & Jiang, DH. Distribution uniformity of added elements in twin-roll cast Al–Zn–Mg–Cu alloy by multi-electromagnetic fields. Rare Met. 34, 546–552 (2015). https://doi.org/10.1007/s12598-014-0417-x

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  • DOI: https://doi.org/10.1007/s12598-014-0417-x

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