Using entropy to manipulate the atoms' location. It's so simple and yet so genius, also difficult in practice, but what a great idea. This is such incredible information. Thank you so much. This is genuinely one of the most amazing things I've ever heard, I wish I could be in a lab doing what you guys do. Alas, not everybody has the potential to do that. However you're findings are remarkable and I wish you all the best.
Of course! Liam used the Lammps (www.lammps.org) package. For some time now he has been using pyiron (www.pyiron.org) to manage his calculations; If you have conda installed, you can get a python interface to running Lammps quickly and easily with `conda install -c conda-forge pyiron_atomistics lammps` (installation is pretty similar for Windows machines (pyiron.readthedocs.io/en/latest/source/installation.html#lammps-molecular-dynamics-with-interatomic-potentials))
Thanks for reaching out. Concerning your question: Not for glasses or plastics, but for all crystalline materials yes! In crystals (e.g. a chunk of regular steel), plastic deformation typically happens via the creation and motion of a type of defect called a dislocation. The idea behind the Hall-Petch relationship is that when these dislocations are travelling through the material facilitating deformation, they sometimes run into a grain boundary. These boundaries aren't easy for the dislocations to get past, so this winds up impeding the dislocation motion and making it harder to deform the material. Eventually enough of them pile up at the edge of one of these boundaries to force the deformation process to continue. So the idea is that with smaller grains, there's room for fewer dislocations to pile up and they have a harder time reaching this critical mass to actually keep deformation going. Since there's no such animal as a dislocation in amorphous materials (e.g. glasses and plastics), and the model doesn't apply there.
Using entropy to manipulate the atoms' location. It's so simple and yet so genius, also difficult in practice, but what a great idea. This is such incredible information. Thank you so much. This is genuinely one of the most amazing things I've ever heard, I wish I could be in a lab doing what you guys do. Alas, not everybody has the potential to do that. However you're findings are remarkable and I wish you all the best.
good talk thanks
Hello, That was a very clear explanation. Could you share which simulation software has been used? (If it is only allowed to share.)
Of course! Liam used the Lammps (www.lammps.org) package. For some time now he has been using pyiron (www.pyiron.org) to manage his calculations; If you have conda installed, you can get a python interface to running Lammps quickly and easily with `conda install -c conda-forge pyiron_atomistics lammps` (installation is pretty similar for Windows machines (pyiron.readthedocs.io/en/latest/source/installation.html#lammps-molecular-dynamics-with-interatomic-potentials))
@@mpisusmat Thank you for your reply.
Is Hall petch relation is applicable for every material. ??
Thanks for reaching out. Concerning your question: Not for glasses or plastics, but for all crystalline materials yes! In crystals (e.g. a chunk of regular steel), plastic deformation typically happens via the creation and motion of a type of defect called a dislocation. The idea behind the Hall-Petch relationship is that when these dislocations are travelling through the material facilitating deformation, they sometimes run into a grain boundary. These boundaries aren't easy for the dislocations to get past, so this winds up impeding the dislocation motion and making it harder to deform the material. Eventually enough of them pile up at the edge of one of these boundaries to force the deformation process to continue. So the idea is that with smaller grains, there's room for fewer dislocations to pile up and they have a harder time reaching this critical mass to actually keep deformation going. Since there's no such animal as a dislocation in amorphous materials (e.g. glasses and plastics), and the model doesn't apply there.