Studies on the mechanism of the structural change of Lo-Ex
スポンサーリンク
概要
- 論文の詳細を見る
In the previous report, (1) the authors pointed out that the structure of Lo-Ex was affected by the presence of Ca and P. Lo-Ex, containing not more than 0.005% of Ca, showed hyper-eutectic type, while, containing not less than 0.005% of Ca, showed hypo-eutectic type. However, Lo-Ex of hypo-eutectic type was converted into hyper-eutectic type by the addition of P.The studies on the mechanism of the structural change of Lo-Ex is reported in this paper.The results obtained are summarized as follows.(1) In ternary system of Al-Si-Ca, binary eutectic point of Al-Si shifted toward high Si side by the presence of Ca, and eutectic line of Al-Si extremely approached to the axis of Al-Si by further quenching.(2) The effects of P, a well known element to obtain fine Si eutectics, were inhibited by the presence of Ca. It was considered that the formation of Ca3P2 was preferred to that of AlP.(3) The results of researches by means of microautoradiograph and electron microscope showed that Ca was contained in α-Al solid solution, but its content in Si crystals was very smaller. In the presence of Ca and P together, Ca3 P2 was preferentially formed and uniformly distributed. AlP was secondarily formed and made up a heteromorphic nucleus of primary Si crystal. P, having been added to Lo-Ex of hypo-eutectic type, formed Ca3 P2 and inhibited the effects of Ca, by which binary eutectic point of Al-Si shifted. As the results, Lo-Ex was converted from hypo-eutectic into hyper-eutectic type.
- 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
- Mechanical and wear properties of SiC whisker/ADC12 aluminum alloy composites fabricated by die casting.
- Joining of aluminum and ceramics.
- タイトル無し
- Undercooling and solidification behavior of fluid clumps of second-poured melt of hypereutectic Al-Si alloy in Duplex Casting process.
- Change in apparent viscosity of stirred slurry during production of semi-solid hypereutectic Al-Si alloy by slurry-melt mixing process.