Types of Diffusion Creep
Diffusion of vacancies through a crystal can happen in a number of ways. When vacancies move through the crystal (in the material sciences often called a "grain"), this is called Nabarro-Herring creep. Another way in which vacancies can move is along the grain boundaries, a mechanism called Coble creep.
When a crystal deforms by diffusion creep to accommodate space problems from simultaneous grain boundary sliding (the movement of whole grains along grain boundaries) this is called granular or superplastic flow. Diffusion creep can also be simultaneous with pressure solution. Pressure solution is, like Coble creep, a mechanism in which material moves along grain boundaries. While in Coble creep the particles move by "dry" diffusion, in pressure solution they move in solution.
Read more about this topic: Diffusion Creep
Famous quotes containing the words types and/or creep:
“He types his laboured column—weary drudge!
Senile fudge and solemn:
Spare, editor, to condemn
These dry leaves of his autumn.”
—Robertson Davies (b. 1913)
“Ambitious men spend their youth in rendering themselves worthy of patronage; it is their great mistake. While the foolish creatures are laying in stores of knowledge and energy, so that they shall not sink under the weight of responsible posts that recede from them, schemers come and go who are wealthy in words and destitute of ideas, astonish the ignorant, and creep into the confidence of those who have a little knowledge.”
—Honoré De Balzac (1799–1850)