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Related Experiment Video

Updated: May 3, 2026

$Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction$

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Finding the Materials Harder than Diamond: Macroscale and Microscale Studies.

Maxim Yu Arsentev¹, Evgeny I Sysoev², Stepan A Vorobiev¹

¹Infochemistry Scientific Center, ITMO University, 9 Lomonosova Street, Saint-Petersburg 191002, Russia.

ACS Applied Materials & Interfaces

|May 21, 2025

Summary

This summary is machine-generated.

Triply periodic minimal surface (TPMS) metamaterials inspired by crystal structures offer enhanced isotropy and mechanical properties. Twinning grain boundaries in face-centered cubic (FCC) metamaterials significantly boosts performance, outperforming diamond structures.

Keywords:

additive manufacturing cellular materials density functional theory mechanical properties molecular dynamics simulation

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Last Updated: May 3, 2026

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Determining the Mechanical Strength of Ultra-Fine-Grained Metals

Determining the Mechanical Strength of Ultra-Fine-Grained Metals

Published on: November 22, 2021

Area of Science:

Materials Science
Mechanical Engineering
Crystallography

Background:

Triply periodic minimal surfaces (TPMS) are promising templates for architected metamaterials.
Crystal microstructure features can inform the design of advanced metamaterials for enhanced properties.
Previous work demonstrated damage-tolerant, lightweight designs by transferring crystal microstructure features to architected materials.

Purpose of the Study:

To develop a simple, polycrystal-like approach for fabricating TPMS architectures.
To investigate the influence of grain boundaries and packing on metamaterial properties.
To design and evaluate novel metamaterials inspired by crystal structures for superior mechanical performance.

Main Methods:

A polycrystal-like methodology was employed to create TPMS architectures.
Comparative analysis of cellular metamaterials with varying grain boundary types and packing arrangements (FCC vs. random).
Molecular dynamics (MD) simulations were used to study ballistic impact resistance of twinned diamond metamaterials.

Main Results:

Metamaterials with twin grain boundaries exhibited significantly increased isotropy (up to 3.61 times) compared to incoherent boundaries.
Face-centered cubic (FCC) grain packing demonstrated superior Young's and shear moduli and isotropy over random packing.
Twinning a diamond metamaterial resulted in properties exceeding those of a singular diamond lattice, comparable to fullerite, and showing enhanced toughness under ballistic impact.

Conclusions:

A crystal-inspired approach enables the design of high-performance metamaterials with tunable mechanical properties.
Twin grain boundaries and FCC packing are crucial for achieving enhanced isotropy and mechanical moduli in TPMS metamaterials.
The developed methodology facilitates the creation of advanced metamaterials for both macro- and microscale applications, outperforming existing structures like diamond.