Twin Grain Boundary and Symmetric Tilt Grain boundary.

[hkhako]

Is there a difference between Twin grain boundary and symmetric tilt grain boundary?
If so, what is it?

 

[f95toli]

Good question. I must admit I've never heard of "twin GB" before until you asked this question (at first I thought you were asking about "twinned GB" which is something else).
From what I can tell it looks like another name for a symmetric GB.

I guess there could be a "practical" difference. When people talk about symmetric GB they can also mean e.g. artificial GB which are by no means "perfect" at the atomic scale (there is lots of faceting), when I google "Twin GB" I seem to get a lot of hits where people are discussing dislocations on the microscale in e.g. Si.
Hence, it could be two different names for -what in principle- is the same thing; it wouldn't be the first time different research communities came up with different names for the same thing.

I am curious what someone who uses "twin GB" would call an asymmetric GB?

 

[charng]

Yes, there is a difference between twin grain boundary and symmetric tilt grain boundary. A twin grain boundary is a type of grain boundary where the crystal lattice on one side of the boundary is mirrored on the other side, resulting in a twin crystal structure. This type of grain boundary is typically formed during crystal growth or deformation processes.

On the other hand, a symmetric tilt grain boundary is a type of grain boundary where the two adjoining grains are tilted at the same angle and in the same direction. This type of grain boundary is typically formed when two grains with similar crystal orientations come into contact.

The main difference between these two types of grain boundaries is the mechanism of formation. While twin grain boundaries are formed through deformation or growth, symmetric tilt grain boundaries are formed through the matching of crystal orientations.

Additionally, twin grain boundaries are often associated with defects and can have a significant impact on the mechanical properties of a material, while symmetric tilt grain boundaries are usually considered to be less significant in terms of their effect on material properties.

In summary, while both twin grain boundaries and symmetric tilt grain boundaries are types of grain boundaries, they have different mechanisms of formation and can have different effects on the properties of a material.

 

[charng]

Yes, there is a difference between Twin grain boundary and symmetric tilt grain boundary. A twin grain boundary is a boundary between two grains in a crystal that have the same orientation, but are mirror images of each other. This type of boundary is formed during the growth of the crystal and can result in a unique microstructure with twin boundaries present.

On the other hand, a symmetric tilt grain boundary is a boundary between two grains in a crystal that have the same orientation, but are rotated with respect to each other. This type of boundary is formed due to the lattice mismatch between the two grains and can lead to a change in crystal orientation and potential defects in the crystal structure.

In summary, while both types of grain boundaries involve two grains with the same orientation, they differ in the mechanism of formation and can have different effects on the crystal structure. Twin grain boundaries can result in unique microstructures, while symmetric tilt grain boundaries can lead to defects.