Al-Si-Be系平衡状態図の研究

Solubility of beryllium in aluminum was determined by means of electric resistance measurement and microscopic examination. It was found that the solubility of beryllium in aluminum decreased repidly as temperature decreased; the solubility was 0.25wt.%at 630°C, 0.15wt.%at 600°C and less than 0.07wt.%at 560°C. The equilibrium diagram of the aluminum-silicon-beryllium was also investigated by thermal analyses, microscopic examination, and X-ray microanalyses. It was concluded that this system had a peritecto-eutectic reaction instead of a eutectic reaction which had previously been reported. The peritecto-eutectic reaction was expressed as Liquid+Be = Al+Si at 571°C. The composition at this reaction was 13wt.%Si, 0.5wt.%Be and the rest of Al. The primary surface for aluminum in the present system had a minimum position.