一方向凝固したＡｌ‐Ｍｇ‐Ｓｉ合金の気孔形態に及ぼすミクロ組織の影響
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Aluminum and Al–Mg–Si alloys ingots with pores were fabricated by unidirectional solidification through thermal decomposition of Ca (OH)2 powders. The porosity of aluminum and Al–Mg–Si alloys is 10–17% and 0.1–2%, respectively. While pores with 250–400 μm in diameter were observed in a grain or across several grains in the aluminum ingot, smaller pores with 50–300 μm were observed in an eutectic region between primary α dendrites in the Al–Mg–Si ingots. In the alloys with Mg (0.25–0.5 mass%) and Si (0.2–0.4 mass%), the directional pores are aligned between columnar dendrites grown in the unidirectional solidification. With higher Mg and Si contents, the equiaxed dendrite zone with spherical pores were observed in a region with a low temperature gradient. The results of thermal analyses showed that constitutional supercooling tends to occur with increase in Mg and Si contents and with a low temperature gradient at the solid-liquid interface, and thus spherical pores are evolved. Thus, it is concluded that the pore growth direction has a strong relation with the direction of dendrites.
- 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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