新手法で3Dプリンター用の素材開発を大きく加速～Al-Fe合金系で軽量・高強度・耐熱を実現、輸送機器に実装へ～

2025-12-16 名古屋大学

＜関連情報＞

• https://www.nagoya-u.ac.jp/researchinfo/result/2025/12/3d-al-fe.html
• https://www.nagoya-u.ac.jp/researchinfo/result/upload_images/20251216_engg.pdf
• https://www.nature.com/articles/s41467-025-67281-8

レーザー積層造形用高性能・持続可能なアルミニウム合金シリーズの設計 Design of high-performance sustainable aluminum alloy series for laser additive manufacturing

Naoki Takata,Koki Minamihama,Takanobu Miyawaki,Yue Cheng,Yifan Xu,Wenyuan Wang,Dasom Kim,Asuka Suzuki,Makoto Kobashi & Masaki Kato
Nature Communications  Published:15 December 2025
DOI:https://doi.org/10.1038/s41467-025-67281-8

Abstract

Lightweight Al alloys with enhanced mechanical properties are essential for structural applications across various industries. To promote sustainable material flow, this study introduces an Al-Fe-based multi-elemental alloy series optimized for laser-based additive manufacturing (AM) using powder bed fusion (PBF-LB), leveraging recycling-friendly Al alloys with Fe as a major impurity. The alloy design is based on the concept of elemental partitioning into either the liquid phase (forming metastable Al₆Fe phase for strengthening) or the solid phase (α-Al matrix) during solidification. Investigations of PBF-LB processed Al-Fe-X ternary alloys (X: Cu, Mn, and Ti) reveal the distinct roles of these alloying elements: Cu and Mn stabilize the Al₆Fe phase, while Ti enhances solid-solution strengthening, in the microstructure and associated mechanical properties. Additionally, Ti promotes grain refinement by inducing the heterogeneous nucleation of nanosized Al₃Ti-phase particles, leading to improved material ductility. The combined addition of alloy elements further stabilizes and strengthens the Al₆Fe phase (Cu and Mn). Moreover, Mn and Ti partition independently, enabling precise control of the α-Al/Al₆Fe two-phase microstructure, enhancing high-temperature mechanical performance. This study provides new insights for controlling refined metastable phases formed via PBF-LB, facilitating the development of high-performance, sustainable Al alloys for AM technologies.