Verification of the Mechanism of Grain Refinement by Ultrasonic Treatment of Aluminum-4 Wt Pct Silicon Molten Alloy

Kazuki Matsuda, Tsuyoshi Takehara, Minghan Yang, Hikaru Uno, Takashi Kubo, Gaku Miyano, Makoto Yoshida

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    Ultrasonic treatment (UST) of molten metals produces a fine grain microstructure. Several mechanisms of grain refining by UST have been suggested; however, experimental verification has not yet established the actual mechanism. In this study, UST was applied to Al-4 wt pct Si molten alloy (1) above the liquidus temperature, (2) during undercooling before recalescence, (3) during recalescence, and (4) after recalescence. After UST treatment, the average grain sizes of the solidified samples were measured, and the effects of UST were evaluated. In the case of (1), the temperatures of the crucible, ultrasonic horn, and the atmosphere of the molten alloy were also confirmed above the liquidus temperature, and a finer grain structure was obtained. This result reveals that UST promotes the nonequilibrium nucleation mechanism. UST during (2) and (3) also caused finer grain microstructures, whereas (4) did not. UST during undercooling hastened nucleation. However, the previously reported mechanism of the breaking dendrite was not activated by UST after recalescence.

    Original languageEnglish
    Pages (from-to)1-8
    Number of pages8
    JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
    DOIs
    Publication statusAccepted/In press - 2016 Mar 2

    Fingerprint

    ultrasonic processing
    Grain refinement
    Silicon
    Aluminum
    Molten materials
    Ultrasonics
    aluminum
    silicon
    liquidus
    Undercooling
    supercooling
    nucleation
    Nucleation
    microstructure
    Microstructure
    refining
    crucibles
    dendrites
    Crystal microstructure
    Crucibles

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Metals and Alloys
    • Mechanics of Materials

    Cite this

    Verification of the Mechanism of Grain Refinement by Ultrasonic Treatment of Aluminum-4 Wt Pct Silicon Molten Alloy. / Matsuda, Kazuki; Takehara, Tsuyoshi; Yang, Minghan; Uno, Hikaru; Kubo, Takashi; Miyano, Gaku; Yoshida, Makoto.

    In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 02.03.2016, p. 1-8.

    Research output: Contribution to journalArticle

    @article{a20b7aa69df14d9096043ca4a89c7d12,
    title = "Verification of the Mechanism of Grain Refinement by Ultrasonic Treatment of Aluminum-4 Wt Pct Silicon Molten Alloy",
    abstract = "Ultrasonic treatment (UST) of molten metals produces a fine grain microstructure. Several mechanisms of grain refining by UST have been suggested; however, experimental verification has not yet established the actual mechanism. In this study, UST was applied to Al-4 wt pct Si molten alloy (1) above the liquidus temperature, (2) during undercooling before recalescence, (3) during recalescence, and (4) after recalescence. After UST treatment, the average grain sizes of the solidified samples were measured, and the effects of UST were evaluated. In the case of (1), the temperatures of the crucible, ultrasonic horn, and the atmosphere of the molten alloy were also confirmed above the liquidus temperature, and a finer grain structure was obtained. This result reveals that UST promotes the nonequilibrium nucleation mechanism. UST during (2) and (3) also caused finer grain microstructures, whereas (4) did not. UST during undercooling hastened nucleation. However, the previously reported mechanism of the breaking dendrite was not activated by UST after recalescence.",
    author = "Kazuki Matsuda and Tsuyoshi Takehara and Minghan Yang and Hikaru Uno and Takashi Kubo and Gaku Miyano and Makoto Yoshida",
    year = "2016",
    month = "3",
    day = "2",
    doi = "10.1007/s11661-016-3377-y",
    language = "English",
    pages = "1--8",
    journal = "Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science",
    issn = "1073-5623",
    publisher = "Springer Boston",

    }

    TY - JOUR

    T1 - Verification of the Mechanism of Grain Refinement by Ultrasonic Treatment of Aluminum-4 Wt Pct Silicon Molten Alloy

    AU - Matsuda, Kazuki

    AU - Takehara, Tsuyoshi

    AU - Yang, Minghan

    AU - Uno, Hikaru

    AU - Kubo, Takashi

    AU - Miyano, Gaku

    AU - Yoshida, Makoto

    PY - 2016/3/2

    Y1 - 2016/3/2

    N2 - Ultrasonic treatment (UST) of molten metals produces a fine grain microstructure. Several mechanisms of grain refining by UST have been suggested; however, experimental verification has not yet established the actual mechanism. In this study, UST was applied to Al-4 wt pct Si molten alloy (1) above the liquidus temperature, (2) during undercooling before recalescence, (3) during recalescence, and (4) after recalescence. After UST treatment, the average grain sizes of the solidified samples were measured, and the effects of UST were evaluated. In the case of (1), the temperatures of the crucible, ultrasonic horn, and the atmosphere of the molten alloy were also confirmed above the liquidus temperature, and a finer grain structure was obtained. This result reveals that UST promotes the nonequilibrium nucleation mechanism. UST during (2) and (3) also caused finer grain microstructures, whereas (4) did not. UST during undercooling hastened nucleation. However, the previously reported mechanism of the breaking dendrite was not activated by UST after recalescence.

    AB - Ultrasonic treatment (UST) of molten metals produces a fine grain microstructure. Several mechanisms of grain refining by UST have been suggested; however, experimental verification has not yet established the actual mechanism. In this study, UST was applied to Al-4 wt pct Si molten alloy (1) above the liquidus temperature, (2) during undercooling before recalescence, (3) during recalescence, and (4) after recalescence. After UST treatment, the average grain sizes of the solidified samples were measured, and the effects of UST were evaluated. In the case of (1), the temperatures of the crucible, ultrasonic horn, and the atmosphere of the molten alloy were also confirmed above the liquidus temperature, and a finer grain structure was obtained. This result reveals that UST promotes the nonequilibrium nucleation mechanism. UST during (2) and (3) also caused finer grain microstructures, whereas (4) did not. UST during undercooling hastened nucleation. However, the previously reported mechanism of the breaking dendrite was not activated by UST after recalescence.

    UR - http://www.scopus.com/inward/record.url?scp=84959482339&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=84959482339&partnerID=8YFLogxK

    U2 - 10.1007/s11661-016-3377-y

    DO - 10.1007/s11661-016-3377-y

    M3 - Article

    SP - 1

    EP - 8

    JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

    JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

    SN - 1073-5623

    ER -