2020 Fiscal Year Final Research Report
Effects of Minor Addition of Non-metallic Elements on Bulk Metallic Glass Formation
| Project/Area Number |
17K06882
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Metal making/Resorce production engineering
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| Research Institution | Hakodate National College of Technology |
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Principal Investigator |
MIZUNO Akitoshi 函館工業高等専門学校, 一般系, 准教授 (10348500)
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| Project Period (FY) |
2017-04-01 – 2021-03-31
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| Keywords | 二成分系バルク金属ガラス / 無容器凝固 / ガラス形成能 |
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| 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.
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| Free Research Field |
金属融体
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| 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。
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