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High-Strength Al-Zn-Cu-Based Alloy Synthesized by High-Pressure Die-Casting Method

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Abstract

High-strength alloys of Al-xZn-3Cu (x = 20, 30, 40 wt pct) are developed for die-casting process. The maximum tensile strength of the developed alloy is 435 MPa, with a stain to fracture of ~ 4 pct. Microstructural investigation shows that the grain size of α-Al gradually decreases and the area of the Zn-rich region increases as the amount of Zn increases. Local symmetry investigation reveals that the major phase of α-Al contains very fine nanoprecipitations of Zn phase (<10 nm), with a very small amount of strain along {1\( \bar{1} \)0}. In addition, the Zn-rich region of the grain boundary has a very complex microstructure. This study discusses the effect of the microstructure of the developed Al alloys on the mechanical properties.

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Acknowledgments

The authors appreciate Young-Woo Jeong, Dr. Young-Woon Byeon, and Dr. Jae-Pyoung Ahn from Advanced Analysis Center, Korea Institute of Science and Technology, for their support of the 3D tomography analysis. This work was supported by the Regional Specialized Industry Development Program (Project No: R0006348), the Civil-Military Technology Cooperation Program (Project No: 18-CM-MA-16), and also partially supported by the R&D program of Korea Institute of Industrial Technology.

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Authors and Affiliations

  1. R&D Center, Oh-Sung Co. Ltd., Siheung, 15112, Republic of Korea

    Sang-Soo Shin

  2. Korea-Russia Innovation Center, Korea Institute of Industrial Technology, Incheon, 22004, Republic of Korea

    Sung-Jae Won, Hyeongsub So & Kyou-Hyun Kim

  3. Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea

    Sung-Jae Won & Hyeongsub So

  4. Department of Advanced Material Application, Daegu Campus of Korea Polytecnic, Taegu, 41765, Republic of Korea

    Sang-Kee Lee

  5. Manufacturing Technology Office, Korea Institute for Rare Metals, Korea Institute of Industrial Technology, Incheon, 21999, Republic of Korea

    Kyou-Hyun Kim

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  1. Sang-Soo Shin
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Correspondence to Kyou-Hyun Kim.

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Manuscript submitted October 23, 2019.

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Shin, SS., Won, SJ., So, H. et al. High-Strength Al-Zn-Cu-Based Alloy Synthesized by High-Pressure Die-Casting Method. Metall Mater Trans A 51, 6630–6639 (2020). https://doi.org/10.1007/s11661-020-06011-9

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