Effects of Minor Addition of Non-metallic Elements on Bulk Metallic Glass Formation

• Project/Area Number: 17K06882
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Metal making/Resorce production engineering
• Research Institution: Hakodate National College of Technology
• Principal Investigator: MIZUNO Akitoshi 函館工業高等専門学校, 一般系, 准教授 (10348500)
• Project Period (FY): 2017-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000); Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: 二成分系バルク金属ガラス / 無容器凝固 / ガラス形成能 / バルク金属ガラス / 無容器凝固法 / 過冷却液体 / 臨界冷却速度 / 高融点金属融体 / 無容器浮遊法 / 非金属元素添加 / 無容器ガス浮遊法 / 二成分バルク金属ガラス / 微量添加元素 / 金属ガラス / 液体構造

Outline of Final Research Achievements

Effects of oxygen content on the glass forming ability of bulk metallic glass-forming alloys have been investigated by the in situ observation of the cooling process during the containerless solidification using an aerodynamic levitation technique. The oxygen content of approximately 0.3 at.% enhanced the glass forming ability and led to the formation of bulk metallic glass when compared to the alloy containing approximately 0.20 at.% of oxygen. The effect of oxygen on glass forming ability has been qualitatively described in terms of reducing the critical cooling rate of the alloy due to the increase in viscosity.

Academic Significance and Societal Importance of the Research Achievements

従来はバルク金属ガラスを作製することが困難であった二成分系合金を対象として、非金属元素の微量の添加がガラス形成能を高める要因について明らかにした。特に、ガラス形成能を妨げる代表的な元素である酸素の量について、一定程度までは逆にガラス形成能を高めることを無容器凝固法を利用した実験により直接的に示した。本成果によりバルク金属ガラスの形成に高価な金属元素が必要な合金についても、代替の元素として微量の酸素を用いることでバルク金属ガラス形成の可能性を示唆した。

Research Products

• [Journal Article] Effect of Minor Addition of Oxygen on Bulk Metallic Glass Formation of Binary Cu?Zr Alloys via Containerless Processing (2020)
  • Author(s): Mizuno Akitoshi、Harada Takeshi、Watanabe Masahito
  • Journal Title: physica status solidi (b) Volume: 257 Issue: 11 Pages: 2000140-2000140
  • DOI: 10.1002/pssb.202000140
  • Peer Reviewed
• [Journal Article] 無容器浮遊法を用いたガラスおよび高温融液の構造と物性 (2017)
  • Author(s): 水野章敏，増野敦信，岡田純平，石川毅彦
  • Journal Title: セラミックス Volume: 52 Pages: 349-351
• [Presentation] Bulk metallic glass formation of binary Zr-Cu Alloys promoted by containerless processing and oxygen content (2019)
  • Author(s): A. Mizuno , T. Harada , M. Watanabe
  • Organizer: 14th International Conference on the Structure of Non-Crystalline Materials
  • Int'l Joint Research
• [Presentation] 二成分系Zr-Cu合金の無容器凝固によるバルク金属ガラス形成過程の時分割X線回折および微量酸素の影響 (2019)
  • Author(s): 水野章敏
  • Organizer: 日本金属学会