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    Interplay Between Eutectic and Dendritic Growths Dominated by Si Content for Nb-Si-Ti Alloys Via Rapid Solidification

    Source: Journal of Manufacturing Science and Engineering:;2021:;volume( 144 ):;issue: 006::page 61007-1
    Author:
    Guo, Yueling
    ,
    Jia, Lina
    ,
    He, Junyang
    ,
    Zhang, Siyuan
    ,
    Li, Zhiming
    ,
    Zhang, Hu
    DOI: 10.1115/1.4052760
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Rapid solidification techniques such as electron beam additive manufacturing are considered as promising pathways for manufacturing Nb-Si-based alloys for ultra-high-temperature applications. Here, we investigate the microstructure diversity of a series of Nb-Si-Ti alloys via electron beam surface melting (EBSM) to reveal their rapid solidification behaviors. Results show that the microstructural transition from coupled to divorced Nbss/Nb3Si eutectics can be triggered by increasing Si content. The formation of fully lamellar eutectics, evidenced by scanning transmission electron microscopy and atom probe tomography (APT), is achieved in the EBSM-processed Nb18Si20Ti alloy (at%), in contrast to the hypereutectic microstructures in arc-melted counterparts. The dendritic microstructures containing divorced eutectics are generated with a higher content of Si during rapid solidification. The transition from faceted to non-faceted growth of intermetallic Nb3Si occurs with the formation of primary Nb3Si dendrites. The interplay between eutectic and dendritic growths of silicides is discussed to provide insights for future alloy design and manufacture.
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      Interplay Between Eutectic and Dendritic Growths Dominated by Si Content for Nb-Si-Ti Alloys Via Rapid Solidification

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    contributor authorGuo, Yueling
    contributor authorJia, Lina
    contributor authorHe, Junyang
    contributor authorZhang, Siyuan
    contributor authorLi, Zhiming
    contributor authorZhang, Hu
    date accessioned2022-05-08T08:20:49Z
    date available2022-05-08T08:20:49Z
    date copyright12/3/2021 12:00:00 AM
    date issued2021
    identifier issn1087-1357
    identifier othermanu_144_6_061007.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4283824
    description abstractRapid solidification techniques such as electron beam additive manufacturing are considered as promising pathways for manufacturing Nb-Si-based alloys for ultra-high-temperature applications. Here, we investigate the microstructure diversity of a series of Nb-Si-Ti alloys via electron beam surface melting (EBSM) to reveal their rapid solidification behaviors. Results show that the microstructural transition from coupled to divorced Nbss/Nb3Si eutectics can be triggered by increasing Si content. The formation of fully lamellar eutectics, evidenced by scanning transmission electron microscopy and atom probe tomography (APT), is achieved in the EBSM-processed Nb18Si20Ti alloy (at%), in contrast to the hypereutectic microstructures in arc-melted counterparts. The dendritic microstructures containing divorced eutectics are generated with a higher content of Si during rapid solidification. The transition from faceted to non-faceted growth of intermetallic Nb3Si occurs with the formation of primary Nb3Si dendrites. The interplay between eutectic and dendritic growths of silicides is discussed to provide insights for future alloy design and manufacture.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleInterplay Between Eutectic and Dendritic Growths Dominated by Si Content for Nb-Si-Ti Alloys Via Rapid Solidification
    typeJournal Paper
    journal volume144
    journal issue6
    journal titleJournal of Manufacturing Science and Engineering
    identifier doi10.1115/1.4052760
    journal fristpage61007-1
    journal lastpage61007-7
    page7
    treeJournal of Manufacturing Science and Engineering:;2021:;volume( 144 ):;issue: 006
    contenttypeFulltext
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