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Plasticity

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Plasticity is the property where an object loses its elasticity and undergoes irreversible deformation, even after the deformation forces are eliminated. If a material deforms irreversibly without increasing stress or load, then this is called ideal plasticity. For example, when a force is applied to an aluminum rod, it changes its shape, but it does not return to its original shape once the force is removed. Plastic deformation or ductility is thus a permanent deformation or change in the...

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Related Experiment Video

Updated: Sep 10, 2025

Applying Dynamic Strain on Thin Oxide Films Immobilized on a Pseudoelastic Nickel-Titanium Alloy

Applying Dynamic Strain on Thin Oxide Films Immobilized on a Pseudoelastic Nickel-Titanium Alloy

Published on: July 28, 2020

Dislocation-enabled plasticity in rutile TiO_2-x at room temperature.

Bo Yang¹, Nicholas Richter¹, Huan Li¹

¹School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA. boyang837@gmail.com.

|August 26, 2025

Summary

Introducing oxygen vacancies into titanium dioxide (TiO2) enhances its ductility. This study shows oxygen vacancies increase dislocation density, improving fracture toughness in ceramic materials for potential room-temperature applications.

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Last Updated: Sep 10, 2025

Applying Dynamic Strain on Thin Oxide Films Immobilized on a Pseudoelastic Nickel-Titanium Alloy

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Published on: July 28, 2020

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Published on: June 9, 2023

Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures

Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures

Published on: February 8, 2018

Area of Science:

Materials Science
Ceramic Engineering
Solid State Physics

Background:

Ceramics are typically brittle, limiting their applications.
Flash sintering can introduce defects to improve ceramic deformability.
Titanium dioxide (TiO2) exhibits limited room-temperature dislocation mobility.

Purpose of the Study:

To explore toughening ceramic materials by introducing oxygen vacancies into rutile TiO2.
To investigate the deformation behavior of oxygen-deficient TiO2-x using nanoindentation.
To understand the role of point defects and dislocations in ceramic deformation.

Main Methods:

Nanoindentation was used to assess the mechanical properties of TiO2-x.
Transmission electron microscopy (TEM) was employed for post-deformation analysis.
Oxygen vacancies were controllably introduced into the TiO2 lattice.

Main Results:

Oxygen-deficient TiO2-x showed significantly increased dislocation density.
The introduction of oxygen vacancies enhanced dislocation plasticity.
Improved fracture toughness was observed in reduced TiO2 specimens.

Conclusions:

Oxygen vacancies are a viable route to enhance the ductility of ceramic materials like TiO2.
Abundant dislocation plasticity in reduced TiO2 contributes to improved fracture toughness.
This research offers insights for designing more ductile ceramics at room temperature.