Scaling of Dislocation Strengthening by Multiple Obstacle Types

Strengthening of dislocations by multiple obstacle types occurs in many engineering alloys. Theories have rationalized two different scaling laws for the total strength, \( \tau_{t}^{\alpha } = \tau_{1}^{\alpha } + \tau_{2}^{\alpha } , \) with α = 1 or 2, where τ1 and τ2 are the strengths of the two individual obstacle types. Simulations have clearly demonstrated α = 2, while “friction” strengthening must correspond to α = 1. Here, line-tension...