In this paper

research on the mechanical behavior of micronanoscaled metallic glasses (MGs) is reviewed

with an emphasis on works achieved through

in situ

transmission electron microscope. It was found that the strength of micronanoscaled MGs has a nonlinear dependence on sample size. Corresponding to the transition of size-dependent strength

the deformation mechanism of MGs changes gradually from brittle to ductile with the critical transition size being affected by strain rate

e-beam irradiation and thermal history of the sample. Besides monotonic loading

the mechanical behaviors of MGs in response to cyclic loadings and fatigue tests are also reviewed.