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Effects of size on the mechanical response of metallic glasses investigated through in situ TEM bending and compression experiments C.Q. Chena, Y.T. Peia and J.T.M. De Hosson  , a,  aDepartment of Applied Physics, Materials Innovation Institute (M2i), University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands Received 9 July 2009; revised 28 August 2009; accepted 31 August 2009. Available online 8 October 2009. Abstract Quantitative bending and compression tests on micropillars made of two different amorphous alloys, with tip diameters ranging from 93 to 645 nm, are performed in situ in a transmission electron microscope (TEM). Under microcompression each pillar shows an intermittent plastic flow accommodated by inhomogeneous shear banding. However, the individual shear banding events are strongly size-dependent, i.e. in larger pillars the deformation is controlled by nucleation of shear bands, but in smaller pillars it becomes propagation-controlled. On the other hand, the yield stress is essentially size-independent. Microbending tests show further advantages by amplifying size effects and minimizing artifacts. An interesting finding is that by microbending, a switch from highly inhomogeneous to fully homogeneous deformation is observed at an experimentally accessible size regime near 200 nm, whereas it is not accessible under microcompression, even at a sub-100 nm scale. These size effects are well interpreted by a micromechanical model, leading to a deformation map in the stress-size space. A physical picture of nanoscale shear localization process is also provided. Keywords: Transmission electron microscopy (TEM); Amorphous metals; Mechanical properties |
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