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Title: Strength, plasticity, and fracture of bulk metallic glasses
Authors: HAN ZHENG
Keywords: metallic glass, strength, plasticity, fracture, shear band, compression
Issue Date: 1-Aug-2009
Citation: HAN ZHENG (2009-08-01). Strength, plasticity, and fracture of bulk metallic glasses. ScholarBank@NUS Repository.
Abstract: This research work employs uniaxial compression tests and materials characterization methods to study mainly the shear band behaviors of monolithic bulk metallic glasses (BMGs) at room temperature. The experimental results are discussed in four chapters: in Chapter 2, a complete reliability assessment of BMGs is presented, and a method of estimating the failure-free stress is introduced; in Chapter 3, the true stress during plastic deformation of a BMG is studied, shedding light on the controlling factor of the strength of BMGs; in Chapter 4, the mechanisms of the plastic deformation in BMGs via simultaneous operation of multiple shear bands versus a single dominant one are interpreted based on a shear-band instability index; in Chapter 5, the mechanisms of the plastic serrated flow and catastrophic fracture of BMGs are revealed based on quantitative evaluations of the temperature rises in the operating shear band.
Appears in Collections:Ph.D Theses (Open)

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