An introduction to Particle Strengthening from the point of view of crystal structure together with the Orowan equation. At the end, an empirical approach will be shown to compare it to the Orowan equation.
Orowan Equation
Full Code
MET0204220
Module Type
E-learning
Description
Precipitation strengthening was firstly expressed by Orowan to predict the strength. We will see that the presence of precipitates on the slip plane causes the dislocation to bow out between the particles and either shear through the particle or bypass it completely. Such predictions are very difficult to compare with experimental data primarily because particle size and volume fractions need to be carefully measured. In this module Dislocation/Precipitate or particle interactions will be presented in the first section. After that, the Orowan equation will be introduced and mathematically showed. Then, the relationship between the Orowan equation, particle size and volume fraction will be presented. Finally, the Ashby - Orowan equation will be expressed.
What you will learn
- Explain the concepts of Dislocation/Precipitate or Particle Interactions;
- Use the Orowan Equation to calculate Particle Strengthening;
- Define Particle Size and Volume Fraction;
- Make an improved prediction of the Strength Increase.
Module content
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