Abstract
Behavior of magnesium and tin on the particle surface has been examined by in-situ XPS, when Al-Si-Mg-Sn alloy powder is heated in a high vacuum chamber. Tin resolved in the powder particle was found to concentrate as a liquid below the Al2O3 surface film of the particle at the temperature above 505 K. This phenomenon has no relation with the magnesium content of the powder. Magnesium helps tin located below the oxide film in appearing at the particle surface, because magnesium is used for reducing the Al2O3 film in the temperature range from 670 K to 700 K. When Al-Si-Mg-Sn alloy powder was sintered in nitrogen gas atmosphere, the nitrogen content of the sintered material was less than 1/10 of that of Al-Si-Mg sintered material without tin. Thus, it can be concluded that liquid tin covered the surface of aluminum particles and prevented the formation of AlN during sintering.
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