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Hierarchical crack buffering triples ductility in eutectic herringbone high-entropy alloys
Peijian Shi1, Runguang Li2, Yi Li1
1State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of Advanced Ferrometallurgy, School of Materials Science and Engineering, Shanghai University, Shanghai, China.
Science (New York, N.Y.)
|August 20, 2021
Summary
This study introduces a novel eutectic high-entropy alloy (EHEA) with a herringbone structure that self-buffers microcracks. This material achieves exceptional crack tolerance and high elongation, overcoming limitations in conventional alloys.
Area of Science:
- Materials Science
- Metallurgy
- Mechanical Engineering
Background:
- Microcracking limits the lifetime of synthetic materials.
- Biological composites like bone exhibit hierarchical structures for crack tolerance but not high elongation.
Purpose of the Study:
- To develop a material that combines crack tolerance with high uniform tensile elongation.
- To investigate a bionic-inspired hierarchical crack buffering mechanism in alloys.
Main Methods:
- Directional solidification of a eutectic high-entropy alloy (EHEA).
- Microstructural analysis of the resulting herringbone structure.
- Tensile testing to evaluate mechanical properties, including elongation and strength.
Main Results:
- The EHEA exhibits a hierarchically organized herringbone microstructure.
- This structure facilitates bionic-inspired hierarchical crack buffering.
- The material achieved ultrahigh uniform tensile elongation (~50%) with retained strength.
Conclusions:
- The developed EHEA successfully reconciles crack tolerance and high elongation.
- Hierarchical crack buffering in the herringbone structure prevents catastrophic crack propagation.
- This self-buffering material offers a significant advancement over conventional nonbuffering EHEAs.
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