課題番号：

JPMXP1222NI0201

実施機関：

名古屋工業大学

要約

Summary:
Semisolid forging process was performed on A380 aluminium alloy. Cross‐sectional scanning electron microscopy (SEM) and additional electron back scatter diffraction (EBSD) analyses were carried out on the surface of the alloy to observe any modification on the grain size.

Experiments:
Semisolid forged A380 aluminium specimen was prepared for metallurgical analysis. The specimen was grinded using silicon carbide grinding paper of multiple grit (200, 400, 800, 1200, 2400, and 4000) before cleaned and air dried. Subsequently, the specimen was polished using polishing cloth with alumina suspension until mirror-finish. Metallurgical analysis include SEM (ARIM equipment # NI-002) and additional SEM-EBSD was also performed on the specimen accordingly, after the surface cleaning by ion irradiation (ARIM equipment # NI-104).

Results and Discussion:
The semisolid forging process offers the capability to refine the microstructure of A380 aluminium alloy. The refinement include the secondary dendrite arm spacing (SDAS), eutectic phases, and grain size. The characteristic of the grain size at the middle and at the edge of the specimen was analyzed. The result dictates that the grain size are considerably finer at the center of the specimen compared to the edge of the specimen near the cavity wall. It can be deduced that the area adjacent to the cavity wall is the last-to-solidify region during the solidification process of A380 aluminium using semisolid forging process. Therefore, the result provides a visual information of the melt solidification flow during semisolid forging process.

マテリアル情報：Al合金