Thank you for your interest in the Intermetallics Conference from 29.09.-02.10.2025 in Bad Staffelstein.
Here you can find our preliminary programme structure.
School on “Introduction to Dislocation Structures in Metals and Intermetallics” – 02 October 2025
As an additional offer for students and young colleagues, there will be the opportunity to participate in a short school about the basics of Dislocation Structures in Metals and Intermetallics. The school is especially intended for students and young postdocs, the number of participants is limited and will be filled on a first come – first serve basis. There is no additional charge for participation in the school, but registration beforehand is necessary.
09:00-10:30
SoD 1 – Introduction: Dislocation Description and Motion - Elastic Theory of straight Dislocations - Dislocation Core
Sharvan Kumar (Brown University/USA)
Start with a brief description of dislocations: edge, screw, mixed character; Burgers vector and line sense. Response to shear stress and motion (glide, cross slip and climb); jogs and kinks and their motion. Glide loops and prismatic loops. Dislocation density and plastic shear strain rate; [Stress fields of edge and screw dislocations; energy of dislocations; Force on a dislocation and between dislocations; interaction of parallel dislocations; edge dipole configuration]. The dislocation core, Peierls stress and Peierls energy. The origin of kinks on dislocations; Dislocation multiplication – Frank Read Source.
11:00-12:30
SoD 2 – Basics of Dislocations in FCC and BCC structures
Sharvan Kumar (Brown University/USA)
Crystal structure, slip planes and slip directions; Partial dislocations and stacking faults in the FCC structure; Shockley partials and Frank partials; Stacking fault energy; Intrinsic and extrinsic stacking faults; cross-slip of dissociated dislocations. Dislocation reactions: The Lomer-Cotrell Lock. Dislocations in BCC metals; the non-planar screw dislocation core and consequences on flow behavior; The gamma surface.
14:00-15:30
SoD 3 – Introduction to Ordered Structures and Dislocation configurations in the L12 structure
Sharvan Kumar (Brown University/USA)
Order-disorder transformation; Antiphase domains and antiphase boundaries. Basic types of ordered structures and planar defects; Deviation from stoichiometry and accommodation by point defects; dislocation dissociation schemes in the L12 structure. Core structures of screw dislocations in the L12 structure. Temperature dependence of strength in the L12 structure, and experimental observations in single and polycrystals and time-permitting, a brief discussion of a few models that have evolved to explain the positive temperature dependence of strength.