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Related Experiment Video

Updated: Jun 21, 2025

Determining the Mechanical Strength of Ultra-Fine-Grained Metals

Determining the Mechanical Strength of Ultra-Fine-Grained Metals

Published on: November 22, 2021

Lattice Distortion Promotes Incipient Plasticity in Multiprincipal Element Alloys.

Luling Wang¹, Yang Cao^1,2, Yonghao Zhao^1,2

¹Nano and Heterogeneous Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China.

|July 12, 2024

Summary

Multielement alloys show earlier pop-in events than pure metals due to severe lattice distortion. This distortion causes large atomic displacements, requiring less strain to trigger incipient plasticity in nanoindentation.

Keywords:

incipient plasticity lattice distortion molecular dynamics nanoindentation

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Published on: September 23, 2018

Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Multielement alloys often display earlier pop-in events during nanoindentation compared to pure metals.
Understanding the nanoscale physics of incipient plasticity is crucial for materials design.

Purpose of the Study:

To investigate the underlying physics of premature incipient plasticity in metallic materials at the nanoscale.
To elucidate the relationship between lattice distortion and the onset of plastic deformation.

Main Methods:

Large-scale atomic simulations of nanoindentation were performed on various metallic materials.
Quantitative analysis of atomic positions within the nearest neighbor shell was conducted.

Main Results:

A power-law relationship was observed between lattice distortion (δ) and normalized critical pressure (pc/Es).
Severe lattice distortion was identified as the cause of premature incipient plasticity.
Large relative atomic displacements due to distortion necessitate smaller indentation strains to trigger plasticity.

Conclusions:

Lattice distortion is an intrinsic and deterministic factor influencing the first pop-in event in perfect crystals.
The findings provide fundamental insights into the mechanisms governing nanoscale plasticity in alloys.