半凝固鋳造した7075アルミニウム合金のミクロ組織

概要

論文の詳細を見る
In general, most semi-solid slurries are obtained by either the electromagnetic stirring or mechanical stirring of molten alloys during alloy solidification. The advantages of the semi-solid process are low casting temperature, good fluidity of the slurry, and fine solidified structures. However, both processes are costly and require very large equipment. We used a simple inclined cooling plate to produce semi-solid slurry, and many seeds were generated and flowed onto the cooling plate. In this investigation, we cast 7075 aluminum semi-solid slurry and observed the microstructures of products. The microstructures exhibited granular, fine and homogeneous primary aluminum crystals, except in the top area. The top area contained small liquid pools before casting. Dendrite crystals appeared when an inclined cooling plate was not used. The best fraction of solid in the slurries was less than 20% in this process.
Japan Foundry Engineering Societyの論文