Electrodeposition of supersaturated aluminum-based solid solutions for maximizing strength and corrosion resistance

2023 Fiscal Year Final Research Report

• Project/Area Number: 22K14508
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 26050:Material processing and microstructure control-related
• Research Institution: Kyoto University
• Principal Investigator: ZHANG Zelei 京都大学, 工学研究科, 特定助教 (90913400)
• Project Period (FY): 2022-04-01 – 2024-03-31
• Keywords: Electrodeposition / Al alloys / Hardness / Corrosion resistance

Outline of Final Research Achievements

The heterogeneous microstructure in aluminum (Al) alloys, composed of an α-Al solid solution matrix and coarse intermetallics, presents a challenge in balancing mechanical and anti-corrosion properties. Supersaturated Al-based solid solutions are expected to address this issue. In this study, supersaturated Al(Fe) and Al(Si) solid solutions with a single phase have been electrodeposited in chloroaluminate ionic liquids (ILs). The active species responsible for Fe or Si reduction have been identified through spectral analysis and DFT calculations. Al(Fe) deposits show simultaneous improvements in mechanical and anti-corrosion properties, while Al(Si) exhibits a less compact microstructure, leading to failure. Furthermore, thermal decomposition of Al(Fe) and Al(Si) deposits can be suppressed above 200 ℃.

Free Research Field

材料加工および組織制御関連

Academic Significance and Societal Importance of the Research Achievements

Al alloys are subject to the conflict between strength and corrosion resistance. This research gives high-strength but also corrosion-resistant Al-Fe alloys, thanks to a homogeneous microstructure.