Welding of the metallic glass in the super cooling liquid state

• Project/Area Number: 16K06025
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Production engineering/Processing studies
• Research Institution: Kanagawa University
• Principal Investigator: Takeshi Terajima 神奈川大学, 工学部, 准教授 (10402992)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2016: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
• Keywords: 金属ガラス / 過冷却液体状態 / 接合 / ヒートガン / 過冷却状態 / 機械材料

Outline of Final Research Achievements

Spot welding of the Au60Cu15.5Ag7.5Si17 metallic glass (the glass transition temperature, Tg=87 deg.C and the crystallization temperature, Tx=127 deg.C) in the supercooling state was examined using the heat gun. The specimen was softened and showed viscous flow according to the glass transition from the glass state to the supercooling liquid state. The metallic glass was successfully weld under the assist of the supersonic transducer, which assisted the viscos flow at the welding spot.

Academic Significance and Societal Importance of the Research Achievements

金属ガラス特有の過冷却液体状態（液相線温度の6割程度で軟化）に着目し、この付近にガス温度を調節したArガスジェットを熱源に用いてAu60Cu15.5Ag7.5Si17金属ガラスの過冷却液体接合を試みた。その結果、結晶化させることなく接合することに成功した。これより次のことを明らかにした。1：ガス温度をガラス遷移温度Tg以上、結晶化温度Tx以下に保つことで直ちに結晶化させることなく過冷却液体状態に遷移させることができた、2：過冷却液体接合後は急冷する必要がなく結晶化を防ぐことができた、3：高速Arガスジェットのガス圧に加えて超音波振動子を併用することで接合を達成することができた。

Research Products

• [Journal Article] Trial study of mirror-surface cutting of Zr-based bulk metallic glass with single-crystal single-point diamond cutting (2018)
  • Author(s): 中尾陽一, 坂田脩, 林晃生, 寺島岳史
  • Journal Title: Journal of the Japan Society for Abrasive Technology Volume: 62 Issue: 4 Pages: 211-218
  • DOI: 10.11420/jsat.62.211
  • NAID: 130007492671
  • ISSN: 0914-2703, 1880-7534
  • Year and Date: 2018-04-01
  • Peer Reviewed
• [Journal Article] Zr基金属ガラスに対する単結晶ダイヤモンド切削による鏡面加工の試み (2018)
  • Author(s): 中尾陽一、坂田脩、林晃生、寺島岳史
  • Journal Title: 砥石加工学会誌 Volume: 62 Pages: 211-218
  • NAID: 130007492671
  • Peer Reviewed
• [Journal Article] Influence of Cutting Condition on Surface Roughness in Single Point Diamond Turning of Zr-based Bulk Metallic Glass (2017)
  • Author(s): Shu Sakata, Akio Hayashi, Takeshi Terajima and Yuichi Nakao
  • Journal Title: Proceedings of IMECE2016 Volume: 2
  • Peer Reviewed
• [Presentation] ガラス遷移温度が沸騰水温度以下の Au 基金属ガラ スの開発 (2019)
  • Author(s): 高木初起, 寺島岳史
  • Organizer: 日本機械学会関東支部第25期総会・講演会
• [Presentation] 金属ガラスウールの開発と評価 (2018)
  • Author(s): 永田俊也，寺島岳史
  • Organizer: 日本機械学会関東支部第24期総会・講演会
• [Presentation] 金属ガラスウールの開発と評価 (2018)
  • Author(s): 永田舜也、寺島岳史
  • Organizer: 関東支部第24期総会・講演会
• [Presentation] Influence of Cutting Condition on Surface Roughness in Single Point Diamond Turning of Zr-Based Bulk Metallic Glass (2017)
  • Author(s): Shu Sakata, Akio Hayashi, Takeshi Terajima and Yuichi Nakao
  • Organizer: IMECE2016
  • Place of Presentation: フェニックス
  • Year and Date: 2017-11-11
  • Int'l Joint Research