大気中および真空中で熱処理した高純度アルミニウム中の鉛の表面偏析
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Surface segregation of Pb in high purity Al–13 at-ppm Pb foil annealed at 813–923 K in different environments, open air and vacuum (about 0.1 Pa) in addition to argon gas, was studied by RBS and TEM observations. In an open air and argon atmospheres, the surface segregation increased with annealing time but it was decreased with annealing in vacuum. TEM observations revealed that most of the lead element in the foils segregated not to the aluminum foil surface, i.e., aluminum/oxide interface, but to the oxide film, amorphous phase, formed just above the foil surface by annealing in open air or argon gas atmospheres, though the thicker oxide film was formed in the air environment. When the foil annealed in an argon gas at first and then annealed in vacuum, the amorphous oxide phase transformed to fine crystalline of γ–Al2O3, which was introduced by the decrease of lead element. The competition between the thermal diffusion of lead through aluminum matrix and the vaporization of lead at the oxide film surface resulted in the surface segregation of lead. In-situ TEM observations using hot stage was also confirmed clearly the vaporization phenomena of lead from foil surface.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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