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Microstructure evolution of laser surface remelted Zn-2.7 wt.%Cu hyperperitectic alloy

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Abstract

Laser surface remelting experiments on Zn-2.7 wt.%Cu hyperperitectic alloy were performed by using a 5kW CW CO2 laser at beam scanning velocities ranging between 6 and 1,207 mm/s. With the increase of the growth rate, the microstructures of Zn-2.7 wt.% Cu alloy changed from planar interface to lamellar structures, cellular structures, and finally to high velocity absolute stability (HVAS) planar interface at a growth rate of 349 mm/s. The critical growth rate for the transformation from lamellar structure to cells was about 96 mm/s. Quantitative measurement was preformed to reveal the relationship between the average lamellar spacing and the corresponding growth rate, and the results are in excellent agreement with the prediction of the TMK eutectic model.

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Acknowledgements

This work is financially supported by the National Natural Science Foundation of China Grant No. 50201012, 50471065. The authors would like to thank Miss Qian Chen and Miss Xiaoqin Yu of Lan Zhou University of Technology for her enthusiastic help.

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Authors and Affiliations

  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, P.R. China

    Yunpeng Su, Xin Lin, Meng Wang & Weidong Huang

  2. Department of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot, 010051, P.R. China

    Sen Yang

  3. Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong

    Yunpeng Su

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  1. Yunpeng Su
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  2. Xin Lin
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  3. Sen Yang
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  4. Meng Wang
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Correspondence to Yunpeng Su.

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Su, Y., Lin, X., Yang, S. et al. Microstructure evolution of laser surface remelted Zn-2.7 wt.%Cu hyperperitectic alloy. J Mater Sci 42, 4763–4771 (2007). https://doi.org/10.1007/s10853-006-0618-2

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  • DOI: https://doi.org/10.1007/s10853-006-0618-2

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