Modeling the mechanical behavior of semisolid alloy supported by solidification microstructure through four-dimensional in-situ observation

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K15071
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 26060:Metals production and resources production-related
• Research Institution: Kyoto University
• Principal Investigator: Narumi Taka 京都大学, 工学研究科, 助教 (20827448)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 凝固 / 鋳造 / 固液共存体 / マクロ偏析 / 鋳造割れ / 放射光 / 時間分解トモグラフィ/4D-CT / 三次元X線回折/3DXRD

Outline of Final Research Achievements

Semisolid deformation of metallic alloys during casting processes often cause macrosegregation, cracking and hot tear. The mechanics of semisolid alloys, which are mixtures of the solid and the liquid phase, cannot be covered by solid or liquid mechanics. In addition, although it is well known that the mechanical behavior of semisolid alloys is closely related to the internal microstructure, no deformation model is built. In this project, X-ray imaging techniques are used for in-situ observation and quantification of deformation behavior of semisolid alloys with controlled internal microstructure. The deformation mechanism of semisolid alloys was demonstrated using quantitative data for deformation microstructure in semisolid alloys during non-uniform deformation.

Free Research Field

金属・資源生産工学

Academic Significance and Societal Importance of the Research Achievements

大型放射光施設のSPring-8の放射光の特長を活かしたX線イメージング技術を用いて、金属材料の生産性や特性の限界に影響を及ぼす鋳造欠陥の形成過程の三次元・時間分解その場観察を実現した。観察データを用いた変形している固液共存組織の定量評価により、固液共存体の変形挙動が明らかになった。定量データは今後モデル構築に活用されるだけではなく、組織形成シミュレーションや物性値の妥当性評価にも用いることができ、その知見は金属材料の生産プロセスの発展に貢献する。