# Milestones in the History of Dislocations

| Here are a few of the major milestones in the discovery of dislocations:
|  | Theory of Elasticity | Timpe (1905) Volterra (1907)
|  | Theoretical shear limit | Frenkel (1926)
|  | "Verhakungen" | Dehlinger (1929)
|  | Postulate of (edge) dislocations | Orowan (1934) Polanyi (1934) Taylor (1934)
|  | Postulate of screw dislocations | Burgers (1939)
|  | Multiplication mechanisms of dislocations | Frank-Read (1950)
|  | Direct observation of dislocations (TEM) | Hirsch et al. (1956)
|  | Dislocation free Si crystal growth | Dash (1960)
| These discoveries solved the 3000 year old puzzles of metallurgy! But no Noble prizes were awarded and mankind hardly noticed that something big has happened.

With frame

5.1.1 Dislocations

© H. Föll (Defects - Script)