2025年12月15日、 Assistant Prof. Dr. Shao-Pu Tsai (蔡劭璞) によるご講演が第181回構材ゼミとして開催されます。
日時：2025年12月15日（月曜日）11：00-12：00
場所：NIMS千現地区 先進構造材料研究棟5階カンファレンスルーム
講演題目：Additively manufactured sustainable 8xxx series aluminum alloys
講演者：Assistant Prof. Dr. Shao-Pu Tsai (蔡劭璞) , Department of Materials Science and Engineering, National Taiwan
University, Taiwan
開催者：井誠一郎（微細組織解析グループ）
Abstract:
The deleterious influence of iron on recycled cast aluminum alloys has historically constrained their applicability within the metallurgical community. This investigation leverages powder metallurgy routes, specifically the transformation of recycled aluminum alloys into powders followed by net-shape fabrication via laser-powder bed fusion (L-PBF), to overcome limitations associated with conventional casting. Fe-containing aluminum alloys were systematically processed by L-PBF, with their microstructural evolution elucidated through in-situ heating transmission electron microscopy (TEM). High-temperature tensile testing was conducted to ascertain the alloys’ mechanical responses under thermal stress. The analyses demonstrate the presence of precipitate embryos within the cellular microstructure of as-built specimens, which manifest significant coarsening and dissolution concomitant with cellular structure breakdown above 325 °C. This thermal regime corresponds with a pronounced deterioration in mechanical properties, indicating a critical threshold for high-temperature performance in additively manufactured, Fe-bearing aluminum alloys.