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Three-Stage Homogenization of Al-Zn-Mg-Cu Alloys Containing Trace Zr

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Under various homogenization conditions, the precipitation behavior of Al3Zr dispersoids and its effects on the microstructures and tensile properties of an Al-7.8Zn-1.62Mg-1.81Cu (AA7085) alloy with zirconium addition within the AA7085 composition standard were investigated in the current study. It was found that a three-stage homogenization [723 K (450 °C)/12 h, 623 K (350 °C)/8 h, and 753 K (480 °C)/12 h] enhanced the uniformity of the Al3Zr dispersoid distribution, revealing that a large number of pre-precipitated MgZn2 dispersoids with diameters less than one micrometer were favorable nucleation sites for the Al3Zr dispersoids. The uniform distribution of Al3Zr dispersoids reduced recrystallization during hot-rolling and solution heat treatment, improving the tensile properties of the as-aged sample by 6.5 pct.

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Acknowledgments

The authors gratefully acknowledge the financial support provided by the National Basic Program of China (2010CB731700 and 2012CB619500).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Central South University, Room 114, Te Ye Building, Changsha, Hunan, 410083, P.R. China

    Yun-lai Deng (Professor), Yun-ya Zhang (Graduate Student), Li Wan (Graduate Student) & Xin-ming Zhang (Professor)

  2. Department of Materials Science and Engineering, University of Virginia, Charlottesville, VA, 22904, USA

    Alf A. Zhu (Senior Scientist)

Authors
  1. Yun-lai Deng
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  2. Yun-ya Zhang
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  3. Li Wan
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  4. Alf A. Zhu
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  5. Xin-ming Zhang
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Correspondence to Yun-lai Deng.

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Manuscript submitted October 1, 2012.

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Deng, Yl., Zhang, Yy., Wan, L. et al. Three-Stage Homogenization of Al-Zn-Mg-Cu Alloys Containing Trace Zr. Metall Mater Trans A 44, 2470–2477 (2013). https://doi.org/10.1007/s11661-013-1639-5

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  • DOI: https://doi.org/10.1007/s11661-013-1639-5

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