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Related Concept Videos

Metallic Solids02:37

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...

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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
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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.

Keywords:
alloy designeutectic high‐entropy alloylaser powder bed fusionmaximal strengthmolecular dynamics

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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.