A6063合金押出材の黒斑発生に及ぼす析出物の影響
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概要
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It has been known that the black spot formation in 6063 alloy extrusion is affected by the cooling process after hot extrusion. However, the influence of precipitation on the black spot formation has not been made clear, because reported experimental results are insufficient to confirm the mechanisms of the black spot formation in surface treatment. In the present research, the black spot formation was studied from the metallographical point of view taking account of the experimental facts on the surface treatment.The main results were as follows:1) The black spot formation was attributed to the precipitation of β' Mg2 Si phase irrespective of the size of the precipitates.2) The precipitation of β' phase was accelerated by the thermal process of rapid cooling and reheating.3) The black spots were not induced only by slow cooling due to the retardation of the precipitation of β' phase.4) It was made clear experimentally that the black spot formation in the industrial process would be caused by the thermal process, that is, by rapid cooling and reheating on the carbon plates of the run-out and cooling tables.
- 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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