654877bd_erials_Science_and_Engineering__Significance
[Date] 1934 [Candidate Moment] Egon Orowan, Michael Polyani, and G.I. Taylor, in three independent papers, propose that the plastic deformation of ductile materials could be explained in terms of the theory of dislocations. [Significance] 
Provides critical insight toward developing the modern science of solid mechanics.
Greatest Moments in Materials Science and Engineering
Significance