Enhanced mechanical properties and homogeneous T5 age-hardening behavior of Al-Si-Cu-Mg casting alloysopen access
- Authors
- Son, Hyeon-Woo; Lee, Ji-Young; Cho, Young-Hee; Jang, Jae-il; Kim, Soo-Bae; Lee, Jung-Moo
- Issue Date
- Oct-2023
- Publisher
- Elsevier Ltd
- Keywords
- Al -Si -Cu -Mg alloy; T5 treatment; Melting temperature; Precipitate; Melt treatment
- Citation
- Journal of Alloys and Compounds, v.960, pp.1 - 9
- Indexed
- SCIE
SCOPUS
- Journal Title
- Journal of Alloys and Compounds
- Volume
- 960
- Start Page
- 1
- End Page
- 9
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/192297
- DOI
- 10.1016/j.jallcom.2023.170982
- ISSN
- 0925-8388
- Abstract
- In this study, the effects of melt-holding temperatures on the mechanical properties and T5 age-hardening behavior of Al-Si-Cu-Mg alloys were investigated. An enhanced yield strength, tensile strength, and elongation were observed simultaneously as the melt-holding temperature was increased from 720 °C to 820 °C. The enhanced mechanical property of the T5-treated Al-Si-Cu-Mg alloy with high melt-holding temperature was attributed to several microstructural changes, including a refinement of the microstructure and an acceleration of the precipitation kinetics caused by enhanced second-phase dissolution. The high melt-holding temperature was particularly effective in changing the precipitation kinetics. This was demonstrated by the formation of a single peak upon homogenization of the solute distribution, replacing the double hardness peaks found in the Al-Si-Cu-Mg alloy with a low melt-holding temperature. The homogeneous solute distribution not only increased the number of Si- and β-type precipitates in the alloy with a high melt-holding temperature but also refined their size. In addition, the high melt-holding temperature accelerated the segregation behavior of Cu on the Si precipitates, which is critical for the refinement of precipitates.
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