Study on the Precipitation Sequence in Al-Zn-Mg with Low Zn/Mg Aged at 200°C

Authors

  • Vu Ngoc Hai University of Toyama, Graduate School of Science and Engineering, Toyama, Japan
  • Takaaki Yagi University of Toyama, Graduate School of Science and Engineering, Toyama, Japan
  • Taiki Tsuchiya University of Toyama, Faculty of Sustainable Design, Toyama, Japan
  • Kenji Matsuda University of Toyama, Faculty of Sustainable Design, Toyama, Japan
  • Wanlalak Sanphiboon University of Toyama, Graduate School of Science and Engineering, Toyama, Japan https://orcid.org/0009-0008-3351-3191
  • Abrar Ahmed University of Toyama, Graduate School of Science and Engineering, Toyama, Japan
  • Tomoo Yoshida Aisin Keikinzoku Co., LTD, 12-3, Toyama, Japan https://orcid.org/0009-0004-5459-3144
  • Susumu Ikeno Professor Emeritus, University of Toyama, Toyama, Japan
  • Karin Shibata Aisin Keikinzoku Co., LTD, 12-3, Toyama, Japan
  • Seungwon Lee University of Toyama, Faculty of Sustainable Design, Toyama, Japan
  • Norio Nunomura University of Toyama, Faculty of Sustainable Design, Toyama, Japan https://orcid.org/0000-0003-0469-9675
  • Hiroaki Matsui Aisin Keikinzoku Co., LTD, 12-3, Toyama, Japan
  • Satoshi Murakami University of Toyama, Faculty of Sustainable Design, Toyama, Japan

DOI:

https://doi.org/10.24425/amm.2025.155488

Abstract

Al-Zn-Mg alloys are known for their high strength-to-weight ratio. This study focuses on the changes in mechanical and microstructural properties in an alloy with a low Zn/Mg ratio. Micro Vickers hardness results showed that the alloy reached peak hardness during optimal aging, then gradually softened, which is typical of over-aging. TEM analysis focusing on the <110>Al revealed precipitates such as η, η', T, and T' phases that evolved as aging progressed. Initially, the precipitates couldn’t be observed, and by peak aging, the coexisting of η, η', T, and T' phases became dominant, playing a major role in the hardness. As the aging continued, the precipitates grew, while the number density decreased. This study offers insight into how precipitate phases affect the strength and properties of Al-Zn-Mg alloys when exposed to high temperatures.

Published

2025-09-30

How to Cite

Hai, Vu Ngoc, et al. “Study on the Precipitation Sequence in Al-Zn-Mg With Low Zn Mg Aged at 200°C”. Archives of Metallurgy and Materials, vol. 70, no. 3, Sept. 2025, doi:10.24425/amm.2025.155488.

Issue

Vol. 70 No. 3 (2025)

Section

Articles