Study on the Relationship between Atomic Structure and Deformation Behavior of Amorphous Alloy View Homepage


Ontology type: schema:MonetaryGrant     


Grant Info

YEARS

2013-2016

FUNDING AMOUNT

900000.0 CNY

ABSTRACT

Unlike crystalline metals and alloys, metallic glasses lack microscopic structure features and their physical and mechanical properties are usually determined by the local atomic structure. More recently, considerable progress has been made in the experimental characterization and theoretical modeling of the short-range atomic structure of metallic glasses. However, the structural evolution from short-range order (SRO) to long-range disorder (LRD) as well as the atomic structure of metallic glasses beyond short- and medium-range order is still poorly unknown, leading to that the correlation between atomic structure and mechanical properties of metallic glasses remains to be one of the most challenged questions in metallic glass research. In the proposed research, multi-scale experimental approaches will be employed to investigate the micromechanisms of plastic deformation of metallic glasses. A scanning coherent angstrom electron diffraction technique will be developed to characterize the long-range disordered atomic structure of metallic glasses. In order to understand the structural origin of shear transformation zones (STZs, i.e. deformation unit), the size and morphology of STZs in various metallic glassed will be characterized by measuring the inhomogeneity of viscoelasticity by dynamic force microscopy. The nucleation and propagation kinetics of microscopic shear bands will be investigated by using nano-indentation in situ straining transmission electron microscopy. On the basis of these multiscale experiments, hierarchical relations between atomic structure with STZs and STZs with shear bands will be estibalished to elucidate the intrinsic correlation between atomic structure and mechanical properties of metallic glasses, which will be vitally important for designing and optimizing metallic glasses with improved mechanical properties. More... »

URL

http://output.nsfc.gov.cn/conclusionProject/e4334e7a555b7ef82dba7878315991ea

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