Microstructure and high-temperature performance of heat-resistant Al-Fe-Mn alloy prepared by laser powder bed fusion
(1. School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan 420023, China;
2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China)
2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China)
Abstract: With the laser remelting of cast alloys combined with non-equilibrium liquidus projection thermodynamic calculations, a high-strength and heat-resistant Al-3Fe-2Mn alloy was designed. Incorporating Mn atoms into the metastable nanoscale Al6Fe phase, occupying some lattice sites, enhances its thermal stability. Additionally, during rapid solidification of laser powder bed fusion (L-PBF), the solubility of Fe and Mn elements in the aluminum alloy increases significantly, forming a supersaturated solid solution with improved strength. This alloy demonstrates excellent processability, achieving a relative density of over 99%, and tensile strengths of 295 MPa at 200 °C and 230 MPa at 300 °C. The Al-3Fe-2Mn alloy holds great potential for wide applications due to its high strength at high temperature.
Key words: Al-Fe-Mn alloy; laser powder bed fusion; high-temperature strength; microstructure; heat-resistant property