Infrared thermal processing history of a Ti-based bulk metallic glass matrix composite manufactured via semi-solid forging

Hofmann, Douglas C.; Roberts, Scott; Kozachkov, Henry

doi:10.1016/j.actamat.2015.05.029

Cited by 13 publications

(3 citation statements)

References 32 publications

(51 reference statements)

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“…Moreover, the temperature at the deposit surface show a general higher magnitude (∼ 0 − 300 • C depending on the location) over the whole IR-profile as compared to the simulated one. It should be noted that care has to be taken when quantitatively interpreting IR-measured data [46]. The total radiation received by the IR sensor is in fact a combination between the direct emission of the target object (result of a temperature-, surface condition-, emitting angle-and alloy composition-dependent emissivity) and contributions linked to reflected radiation and atmospheric emission.…”

Section: Model Applicationmentioning

confidence: 99%

Transient three-dimensional geometrical/thermal modelling of thermal spray: Normal-impinging jet and single straight deposits

Fanicchia

Axinte

2018

International Journal of Heat and Mass Transfer

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A new time-dependent approach to the geometrical and thermal modelling of the deposit footprint in thermal spray processes is proposed. Based upon a three-dimensional finite-difference numerical technique, the model is composed of two integrated sections: a geometrical analysis, accounting for deposit geometry analytical prediction, and a thermal analysis that computes the system temperature history. Primary process factors for the simulation, i.e. plume distribution parameters, jet heat transfer properties and temperature-dependent deposition efficiency are determined in a preliminary stage of model application. Through computation of the simulated impact surface temperature at each instant during the simulation, the deposition efficiency-mediated growth of the deposit is accurately predicted at arbitrary values of torch feed speed. The model is flexible as it only relies on an initial calibration stage performed at a specific set of process parameters to be able to predict deposition geometries at arbitrary conditions, thus avoiding the need of complex simulations and/or knowledge of single splats impact properties. Moreover, this modelling approach has the potential to be extended to several thermal spray processes at arbitrary values of process parameters (e.g. torch design, materials, etc.), opening the way for spray automation in difficult-to-spray geometries and/or repair applications. The proposed modelling framework has been validated on Combustion Flame Spray (CFS) deposition of CoNiCrAlY alloy on stainless steel substrates, yielding low errors (< 5% on average) in predicting the deposit footprint at various torch feed speeds.

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Section: Model Applicationmentioning

confidence: 99%

Transient three-dimensional geometrical/thermal modelling of thermal spray: Normal-impinging jet and single straight deposits

Fanicchia

Axinte

2018

International Journal of Heat and Mass Transfer

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“…Alleviating the catastrophic failure in bulk metallic glasses (BMGs) caused by the highly-localized shear banding deformation is still full of challenges 1 . The advent of BMG composites with in-situ precipitated crystalline dendrites has provided an effective and promising way to circumvent the brittleness 2 3 4 5 6 7 . By means of the good coordination between the crystalline dendrites and glass matrix, enhanced ambient plasticity and high strength have been obtained simultaneously, which also render them as promising candidates of advanced engineering structural materials 8 9 10 .…”

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confidence: 99%

Tensile deformation mechanisms of an in-situ Ti-based metallic glass matrix composite at cryogenic temperature

Bai

Qiao

et al. 2016

Sci Rep

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Remarkable tensile ductility was first obtained in an in-situ Ti-based bulk metallic glass (BMG) composite at cryogenic temperature (77 K). The novel cryogenic tensile plasticity is related to the effective accommodation of ductile body-centered cubic dendrites at 77 K, characteristic of the prevailing slip bands and dislocations, as well as lattice disorder, which can effectively hinder the propagation of critical shear bands. The greatly increased yield strength of dendrites contributes to the high yield strength of composite at 77 K. A trend of stronger softening is observed at low temperature, and a criterion is proposed to understand the softening behavior. The current research could also provide a guidance to the promising cryogenic application of these new advanced BMG composites.

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“…Higher amounts of solid fraction are usually preferred as they reduce porosity, promote laminar flow of liquid, and also improve the surface quality of alloys [24]. Previous research studies on semisolid deformation behaviour of metals have shown that a liquid fraction between 10% and 30% is commonly suitable for semi-solid forging [27].…”

Section: Introductionmentioning

confidence: 99%

Effect of semi-solid forging on microstructure and mechanical properties of in-situ cast Al-Cu-TiB 2 composites

Mathew

Mandal

Kumar

et al. 2017

Journal of Alloys and Compounds

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Permanent WRAP URL:http://wrap.warwick.ac.uk/87711 Copyright and reuse:The Warwick Research Archive Portal (WRAP) makes this work by researchers of the University of Warwick available open access under the following conditions. Copyright © and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable the material made available in WRAP has been checked for eligibility before being made available.Copies of full items can be used for personal research or study, educational, or not-for-profit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT Abstract:The present work deals with the effect of semisolid processing on microstructure and mechanical properties of Al-4.5 % Cu -5% TiB 2 in-situ cast composites. The composite was prepared by flux assisted synthesis in which TiB 2 particles were formed in-situ through an exothermic reaction between K 2 TiF 6 and KBF 4 halide salts. Al-4.5wt% Cu alloy and Al-4.5%Cu-5 % TiB 2 composite samples were forged in semisolid state with 0.3 volume fraction of liquid. Semisolid forging was carried out for two forge reductions (30% and 50% forge reductions). Microstructure studies show that the semi-solid forging results in uniform distribution of TiB 2 particles and Al 2 Cu particles in the composite. Further, TiB 2 particles play a dual role as grain refiners as well as reinforcements of composites. EBSD and nano indentation studies shows that semisolid forging results in dynamic recrystallization of grains in the composite with significant grain refinement which leads to a marked increase in hardness and elastic modulus of the alloy as well as the composite.

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Infrared thermal processing history of a Ti-based bulk metallic glass matrix composite manufactured via semi-solid forging

Cited by 13 publications

References 32 publications

Transient three-dimensional geometrical/thermal modelling of thermal spray: Normal-impinging jet and single straight deposits

Transient three-dimensional geometrical/thermal modelling of thermal spray: Normal-impinging jet and single straight deposits

Tensile deformation mechanisms of an in-situ Ti-based metallic glass matrix composite at cryogenic temperature

Effect of semi-solid forging on microstructure and mechanical properties of in-situ cast Al-Cu-TiB 2 composites

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