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Influence of Temperature Gradient on Microstructure and Microhardness of Directionally Solidified Al-Zn-Mg-Cu Alloy
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Department of Materials Science and Engineering, Beihang University, Beijing 100191, China

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National Key R&D Program of China (2016YFB0300900)

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    Abstract:

    The Al-Zn-Mg-Cu alloy with high Zn content was cast at different temperature gradients by directional solidification. The primary dendrite arm spacing λ1, the secondary dendrite arm spacing λ2, and the Vickers hardness of specimens were characterized. Based on the experiment results, the relationship among temperature gradient, dendritic arm spacing, and microhardness was determined by linear regression analysis and curve fitting analysis. The results are in agreement with the dendritic growth theoretical models, and the solidification parameters of Al-Zn-Mg-Cu alloy were obtained. In addition, the influence mechanism of temperature gradient on microhardness was analyzed. The results have a guidance function on the optimization of preparing methods of Al-Zn-Mg-Cu alloy with high zinc content.

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[Wang Yixuan, Jia Lina, Zhang Hu. Influence of Temperature Gradient on Microstructure and Microhardness of Directionally Solidified Al-Zn-Mg-Cu Alloy[J]. Rare Metal Materials and Engineering,2021,50(11):3910~3916.]
DOI:10.12442/j. issn.1002-185X.20200686

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History
  • Received:September 09,2020
  • Revised:September 21,2020
  • Adopted:October 23,2020
  • Online: November 25,2021
  • Published: November 24,2021