Sugiyama Akira

Al-Cu合金の固液共存状態における変形挙動を，放射光を用いて直接観察した．また水-粒子混合体の変形挙動と比較し，変形の組織に及ぼす影響を調べた．

透過X線の輝度と線吸収係数の関係から，凝固過程における溶質分布の時間分解計測を試みた．

半溶融状態の炭素鋼に変形を与えた場合の結晶粒の挙動について直接観察を行った．

鋳鉄の凝固過程の直接観察結果を報告した．亜共晶鋳鉄において，γデンドライトに続き，共晶黒鉛の成長などが観察された．

Time-resolved X-ray imaging of dendritic solidification for pure Fe and carbon steels with sufficient spatial and time resolutions has been developed for the first time by overcoming essential problems in low contrast between solid and liquid phases and in high melting temperatures. Static observation showed that the solid/liquid interface in pure Fe specimen was determined by the absorption contrast at photon energy ranging from 16 to 30 keV. In addition, the phase contrast was also observed in the vicinity of the interface. Dynamic observation showed that cellular growth in pure Fe specimen was observed at a growth velocity up to 400 mu m/s. Feasibility observation was also performed for two different carbon steels (0.0025 mass% C and 0.45 mass% C). Growing dendrites were observed in-situ at a growth velocity up to 500 mu m/s. This study proves that the developed imaging enabled to observe solidification phenomena in-situ for various kinds of steels.