21. The interaction between the stress fields of dislocations can impede dislocation motion by repulsive or attractive interactions. 22. In substitutional solid solutions, these stress fields are spherically symmetric, meaning they have no shear stress component. 23. Dislocation defects also create a stress field . 24. A "'stress field "'is a region in a body for which the stress is defined at every point. 25. The carbon atoms in the interstitial sites of the lattice creates a stress field that impedes dislocation movement. 26. As these interstitial atoms distort the lattice slightly, there will be an associated residual stress field surrounding the interstitial. 27. Good examples of this phenomenon are the regions near a coherent precipitate or the stress field around a dislocation. 28. The stress fields created by adding solute atoms form the basis of the material strengthening process that occurs in alloys. 29. The bonds are clearly stretched around the location of the dislocation and this stretching causes the stress field to form. 30. The formation of this field is linked to the rifting of the Andahua valley, as well as local stress fields .
