In situ transmission electron microscopy study of alpha-brass nanoligament formation, microstructure evolution and fracture

In situ transmission electron microscopy (TEM) tensile tests were performed to study alpha-brass nanoligament deformation, phase transformation and fracture. Nanoligament, suitable for in situ TEM studies, formed under a high strain rate by multiple dislocations at the propagating crack tip. Nanoligaments deform by dislocation slip under a high strain rate and a short relaxation time. Under a low strain rate and a long relaxation time, interdiffusion induced alpha- to beta- and gamma-phase transformation. Microcracks nucleated near the gamma-phase/alpha matrix interface. Phase transformation and its effect on alloy nanocrystal fracture were studied.

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