Microstructure and properties of a high temperature Al–Ce–Mn alloy produced by additive manufacturing

By A. Plotkowski, K. Sisco, S. Bahl, A. Shyam, Ying Yang, Lawrence F. Allard, P. Nandwana, A. Rossy, Ryan R. Dehoff. 2020

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Abstract An Al–10Ce-8Mn (wt%) alloy was designed and fabricated by laser powder bed fusion additive manufacturing (AM). The rapid cooling rates of the AM process produced a refined microstructure with a large fraction of reinforcing intermetallic phases. The tensile properties of the alloy were characterized in the as-fabricated state and following thermal exposure. The properties of the as-fabricated microstructure showed exceptional high-temperature performance and strength retention at elevated temperatures up to 400 °C relative to benchmark wrought Al and AM Al alloy properties. Characterization of the microstructure and thermodynamic modeling of the ternary Al–Ce–Mn system rationalized the solidification and solid-state phase transformations. Analysis of the relevant strengthening mechanisms for both the as-fabricated and thermally exposed conditions was performed.

Subfields: Automotive Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/5bf7670b076c5d758cc5aaeb4b699c47a649ad52