In situ straining in the transmission electron microscope of an L12-ordered γ′-intermetallic strengthened by disordered γ-particles Original Research Article

Single crystal samples of quaternary alloy Ni69Co9Al18Ti4 were in situ strained in a transmission electron microscope. The alloy consists of an L12-long-range ordered γ′matrix strengthened by particles of the disordered γ-phase. During in situ straining the interaction of the dislocations with the γ-particles was investigated under stress. Microscopic features such as the dissociation width of the superpartial dislocations, bending of the dislocations between the γ-particles and the pinning of the dislocations at the departure side of the γ-particles are in excellent agreement with computer simulations performed recently.