Experimental characterization of plastic flow initiation in a bulk metallic glass via intermittent compression test

Han, Zhenhua; Li, X.P.; Lin, He; Chen, W.; Jiang, F.; Sun, Jun

doi:10.1016/j.intermet.2011.02.013

Cited by 2 publications

(2 citation statements)

References 29 publications

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“…We can conclude that the areas outside shear bands are responsible for the decrease in the magnetization. The shear bands are very thin [3,7], so the free volume increasing in the shear bands has only little eect on T c shift. Higher portion of the sample volume outside shear band accumulates the elastic or the pseudoelastic energy and inuences the measured magnetization.…”

Section: Resultsmentioning

confidence: 99%

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Influence of Plastic Deformation on Magnetic Transition in Soft Magnetic Amorphous Alloys

2012

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Section: Resultsmentioning

confidence: 99%

“…The inuence of plastic deformation on the ductility of amorphous alloys was intensively studied mainly for the alloys with excellent glass forming ability bulk metallic glasses (BMGs) [5,7]. It was shown that the multiplication of shear bands is the eective way to ductilize BMGs [6].…”

Section: Introductionmentioning

confidence: 99%

Influence of Plastic Deformation on Magnetic Transition in Soft Magnetic Amorphous Alloys

2012

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Thermodynamics, Kinetics and Mechanical Behavior of Model Metallic Glasses

Akhtar

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The thermophysical properties and deformation behavior of a systematic series of model metallic glasses was investigated. For Zr-based metallic glasses with all metallic constituents, the activation energy of glass transition was determined to be in the range of 74-173 kJ/mol while the activation energy of crystallization was in the range of 155-170 kJ/mol. The reduced glass transition temperature was roughly the same for all the alloys (~ 0.6) while the supercooled liquid region was in the range of 100-150 K, indicating varying degree of thermal stability. In contrast, the metal-metalloid systems (such as Ni-Pd-P-B) showed relatively higher activation energy of crystallization from short range ordering in the form of triagonal prism clusters with strongly bonded metal-metalloid atomic pairs. Deformation mechanisms of all the alloys were investigated by uniaxial compression tests, strain rate sensitivity (SRS) measurements, and detailed characterization of the fracture surface morphology. For the metal-metal systems, plasticity was found to be directly correlated with shear transformation zone (STZ) size, with systems of larger STZ size showing better plasticity. In metal-metalloid amorphous alloys, plasticity was limited by the distribution of STZ units, with lower activation energy leading to more STZ units and better plasticity. The alloys with relatively higher plasticity showed multiple shear bands while the brittle alloys showed a single dominant shear band and vein-pattern on the fracture surface indicating sudden catastrophic failure. The effect of chemistry change on thermodynamics, kinetics, and deformation behavior was investigated for the model binary NixP100-x and CoxP100-x metallic glasses. Alloys with higher phosphorous content showed greater activation energy of crystallization, indicating better thermal stability. In addition, metallic glasses with higher % P showed greater hardness, modulus, and serrated flow behavior during indentation that is characteristic of inhomogeneous deformation.

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Experimental characterization of plastic flow initiation in a bulk metallic glass via intermittent compression test

Cited by 2 publications

References 29 publications

Influence of Plastic Deformation on Magnetic Transition in Soft Magnetic Amorphous Alloys

Influence of Plastic Deformation on Magnetic Transition in Soft Magnetic Amorphous Alloys

Thermodynamics, Kinetics and Mechanical Behavior of Model Metallic Glasses

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