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Designing Maximal Strength in Nanolamellar Eutectic High-Entropy Alloys
Weiming Ji1, Shubo Gao1, Asker Jarlöv1
1School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
Advanced Materials (Deerfield Beach, Fla.)
|June 27, 2025
Summary
Ultra-strong eutectic high-entropy alloys (EHEAs) were designed using molecular dynamics simulations. A critical interphase spacing enables record tensile strength, surpassing current materials for demanding applications.
Area of Science:
- Materials Science
- Metallurgy
- Computational Materials Science
Background:
- Eutectic alloys have a long history in technological advancements.
- Eutectic high-entropy alloys (EHEAs) show promise for enhanced mechanical properties.
- Developing ultra-strong bulk EHEAs is hindered by cooling rate limitations.
Purpose of the Study:
- To uncover design principles for EHEAs with exceptional mechanical performance.
- To investigate the relationship between interphase boundary spacing and tensile strength in EHEAs.
- To overcome limitations in developing ultra-strong bulk EHEAs.
Main Methods:
- Large-scale molecular dynamics simulations were employed.
- Analysis of governing strengthening and softening mechanisms.
- Experimental validation using laser powder bed fusion (LPBF).
Main Results:
- Maximum tensile strength in EHEAs is linked to a critical interphase boundary spacing.
- This critical spacing is significantly larger than in conventional alloys.
- A tensile strength of 1.8 GPa was achieved, approaching theoretical limits and outperforming other as-printed high-entropy alloys.
Conclusions:
- A viable pathway for designing ultra-strong EHEAs has been established.
- The findings address the challenge of developing high-performance as-printed materials.
- This research offers promising avenues for applications in aerospace and other demanding fields.
