Flow serration and shear-band propagation in porous Mo particles reinforced Mg-based bulk metallic glass composites

Chen, H.M.; Lee, C.J.; Huang, J.C.; Li, T.H.; Jang, Jae-il

doi:10.1016/j.intermet.2010.03.024

Cited by 10 publications

(3 citation statements)

References 24 publications

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“…Among those Mg-based BMGCs, the current authors have demonstrated a highly tough Mg-based BMGC rods strengthened by porous Mo particles [15,18,25]. These porous Mo particles are uniformly distributed in the amorphous matrix of BMG and arranges as the micron-scaled confinement zones.…”

Section: Introductionmentioning

confidence: 76%

Effects of characteristics of Mo dispersions on the plasticity of Mg-based bulk metallic glass composites

Jang

Huang

et al. 2011

Intermetallics

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Section: Introductionmentioning

confidence: 76%

Effects of characteristics of Mo dispersions on the plasticity of Mg-based bulk metallic glass composites

Jang

Huang

et al. 2011

Intermetallics

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“…As is well known, serration flow is a universal phenomenon in ductile BMGs [ 30 , 31 ], but are rarely found in Mg-based BMGs and BMGMCs [ 32 ]. For example, although the addition of Mo induces great plastic strain in BMGMCs, no obvious serration behavior could be found in the stress-strain curves [ 33 ]. Therefore, the observed serration flow phenomenon indicates that the mechanical behavior of the BMGMC has been changed from having a typical brittle quality to a plastic quality.…”

Section: Resultsmentioning

confidence: 99%

Fabrication and Mechanical Behavior of Ex Situ Mg-Based Bulk Metallic Glass Matrix Composite Reinforced with Electroless Cu-Coated SiC Particles

Wang

Zhao

et al. 2017

Materials

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Magnesium-based bulk metallic glass matrix composites (BMGMCs) have better plasticity than the corresponding bulk metallic glasses (BMGs); however, their strength and density are often compromised due to the fact that the effective reinforcement phase is mostly plastic heavy metal. For lightweight SiC-particle reinforced BMGMCs, interface wettability and the sharpness of the particles often reduce the strengthening effect. In this work, SiC particles were coated with a thin Cu coating by electroless plating, and added to Mg54Cu26.5Ag8.5Gd11 melt in an amount of 5 wt % to prepare a BMGMC. The microstructure of the interface, mechanical behavior and fracture morphology of the BMGMC were studied by scanning electron microscopy and quasi-static compression testing. The results showed that the Cu coating improved the wettability between SiC and the matrix alloy without obvious interfacial reactions, leading to the dispersion of SiC particles in the matrix. The addition of Cu-coated SiC particles improved the plastic deformation ability of Mg54Cu26.5Ag8.5Gd11 BMG, proving that electroless plating was an effective method for controlling the interface microstructure and mechanical behavior of BMGMCs.

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“…However, when a shear band is initiated and starts to propagate, there is a corresponding displacement burst, which is linked to a stress decrease. 22 Repeated stress increases and decreases result in serrations as the plastic flow proceeds. Such successive serrations are recognized as arising from an emission of new shear bands and a propagation of the existing ones.…”

Section: Experimental Workmentioning

confidence: 99%

Deformation behaviour of amorphous Fe-Ni-W/Ni bilayer-confined bulk metallic glasses

et al. 2016

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In this study, an amorphous Fe-Ni-W/Ni bilayer was successfully electroplated on a Zr-based bulk metallic glass (BMG), and the deformation behaviour of the bilayer-coating-confined BMG was investigated. The findings show that the macroscopic plasticity of the BMGs was enhanced from 1.3 % to 10.7 %. More importantly, bilayer-confined BMGs have a large plateau of the serrated flow with an insignificant decrement before failure. When characterizing the serrated flows of both uncoated and bilayer-confined BMGs by introducing absolute values of stress raises/drops, smaller amplitudes of stress drops as well as a larger stress-drop frequency during the plastic-deformation stage were found in the bilayer-confined BMGs. The origin of the increased stable plastic flow was discussed, and it is mainly attributed to the enhanced confinement caused by the introduction of the amorphous layer. The findings are significant for enhancing the macroscopic plasticity of the BMGs and for understanding the deformation mechanism of the serrated plastic flow in geometrically confined BMGs. Keywords: plastic flow, bulk metallic glass, amorphous Fe-Ni-W coating, geometric confinement V {tudiji je bilo uspe{no elektroplatirano amorfno, dvoplastno steklo Fe-Ni-W/Ni, na masivno kovinsko steklo (BMG) na osnovi Zr. Hkrati je bilo preiskovano obna{anje dvoplastnega BMG pri deformaciji. Ugotovitve ka`ejo, da se je makroskopska plasti~nost BMG pove~ala z 1,3 % na 10,7 %. [e bolj pomembno je, da ima dvoplasten BMG visok plato nazobljenega dela krivulje z nepomembnim zmanj{anjem pred poru{itvijo. Pri karakterizaciji nazob~anega poteka pri obeh; nepokritem in pri dvoplastnem BMG, z vpeljavo absolutne vrednosti narastka in padca napetosti, so bile dobljene manj{e amplitude padca napetosti kot tudi ve~ja pogostost padca napetosti med plasti~no deformacijo dvoplastno omejenega BMG. Razlo`en je izvor pove~anja stabilnega plasti~nega toka, ki se ga pripisuje okrepitvi, ki jo povzro~i amorfna plast. Ugotovitve so pomembne za pove~anje makroskopske plasti~nosti BMG in za razumevanje deformacijskega mehanizma nazob~anega plasti~nega toka v geometrijsko omejenem BMG. Klju~ne besede: plasti~ni tok, masivno kovinsko steklo, amorfna Fe-Ni-W plast, geometrijska omejenost

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Flow serration and shear-band propagation in porous Mo particles reinforced Mg-based bulk metallic glass composites

Cited by 10 publications

References 24 publications

Effects of characteristics of Mo dispersions on the plasticity of Mg-based bulk metallic glass composites

Effects of characteristics of Mo dispersions on the plasticity of Mg-based bulk metallic glass composites

Fabrication and Mechanical Behavior of Ex Situ Mg-Based Bulk Metallic Glass Matrix Composite Reinforced with Electroless Cu-Coated SiC Particles

Deformation behaviour of amorphous Fe-Ni-W/Ni bilayer-confined bulk metallic glasses

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