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Updated: Feb 15, 2026
08:55
Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
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Thermally-triggered Dual In-situ Self-healing Metallic Materials
JeongTae Kim1,2, Hee Jin Kim1, Sung Hwan Hong1
1Department of Nanotechnology and Advanced Materials Engineering, Sejong University, 209, Neungdong-ro, Gwangjin-gu, Seoul, 05006, Republic of Korea.
Scientific Reports
|February 3, 2018
Summary
This study explores self-healing metallic materials. Adding tin (Sn) and bismuth (Bi) to aluminum (Al)-copper (Cu)-silicon (Si) alloys enables crack filling during processing, creating advanced materials.
Area of Science:
- Materials Science
- Metallurgy
- Solidification Science
Background:
- Investigating microstructural evolution and crack filling in (Al81Cu13Si6)100-x(Sn57Bi43)x composites.
- Utilizing tin (Sn) and bismuth (Bi) for liquid phase separation with aluminum (Al), copper (Cu), and silicon (Si).
Purpose of the Study:
- To investigate the microstructural evolution and crack-filling phenomena in Al-Cu-Si-Sn-Bi composites.
- To explore the potential of liquid phase separation for creating self-crack filling metallic materials.
Main Methods:
- Fabrication of (Al81Cu13Si6)100-x(Sn57Bi43)x composites with varying Sn-Bi content (x = 0, 1, 3 at.%).
- Analysis of microstructural evolution and solidification behavior.
- Observation of crack filling phenomena during heat treatment and warm rolling at 423 K.
Main Results:
- Liquid phase separation occurred, forming distinct Al-Cu-Si-rich (L1) and Sn-Bi-rich (L2) phases with a trimodal eutectic structure.
- Mobile Sn and Bi elements diffused towards strained regions and filled cracks during warm rolling.
- The developed alloy system exhibited dual self-healing characteristics.
Conclusions:
- The alloy design based on liquid phase separation is a novel strategy for creating self-crack filling metallic materials.
- The precipitated Sn-Bi-rich particles and low melting agent contribute to the material's self-healing capabilities.
- This research opens new avenues for developing advanced metallic materials with intrinsic repair mechanisms.
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