2, Center for Integrated Nanotechnologies (CINT), Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico, United States
Plasticity and fracture of materials at the nanoscales can deviate significantly from the same phenomena in bulk properties, which may have important implications if the materials are to be used in real-world engineering systems. Nanoscale metal-metal multilayered materials, where interfaces can be created and modulated in a highly controlled manner and with relative ease, provide a model material system platform to understand plasticity and fracture based on their interactions with other microstructural features at the nanoscales. Recently, there is a growing trend to understand fracture of multilayered materials to see the interactions between the crack and multilayered interface through novel experimentation techniques. In this review, we will introduce the rationale behind this trend and the current microfracture testing methods to test and analyze multilayer fracture behavior. Four examples of in situ fracture techniques are highlighted in this work – the in situ observation upon tensile testing of film on a substrate, the in situ microfracture clamped beam bending technique across the multilayers for accumulative roll bonded as well as physical vapor deposited multilayers and the in situ delamination of metal-metal multilayers along the multilayered interface.