NARTU, Mohan Sai Kiran Kumar Yadav; ALAM, Talukder; DASARI, Sriswaroop; MANTRI, Srinivas Aditya; GORSSE, Stéphane; SILLER, Hector; DAHOTRE, Narendra; BANERJEE, Rajarshi

doi:10.1016/j.mtla.2019.100522

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NARTU, Mohan Sai Kiran Kumar Yadav
Advanced Materials and Manufacturing Processes Institute
Center for Agile and Adaptive Manufacturing [CAAAM]

ALAM, Talukder
Advanced Materials and Manufacturing Processes Institute
Center for Agile and Adaptive Manufacturing [CAAAM]

DASARI, Sriswaroop
Advanced Materials and Manufacturing Processes Institute
Center for Agile and Adaptive Manufacturing [CAAAM]

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Materialia. 2020, vol. 9, p. 100522 (9 p.)

Elsevier

Résumé en anglais

A precipitation strengthenable high entropy alloy (HEA), Al0.3CoCrFeNi, was processed via laser-based additive manufacturing (AM), using the laser engineered net shaping (LENS) process. The as LENS processed HEA exhibited twice the tensile yield strength, as compared to the conventionally arc-melted and solution treated HEA of the same composition, with a tensile ductility greater than 20%. Subsequent heat-treatments of the AM HEA alloy led to further enhancement of the yield strength while maintaining good tensile ductility. The microstructure of these AM alloys was investigated by coupling transmission electron microscopy (TEM) and atom probe tomography (APT). The near doubling of the yield strength in case of the as AM processed HEA samples, which were devoid of second phase intermetallic precipitates, has been rationalized based on the formation of nanometer-scale Al–Ni rich solute clusters due to the re-heating of the deposited layers during AM. The enhanced yield strength due to these solute clusters has been estimated using a simple cluster-dislocation interaction model involving the coherency strain fields of these nano-clusters. The even higher yield strength in case of the heat-treated AM HEA samples has been quantitatively rationalized employing precipitation strengthening models, based on nanometer scale L12 (gamma prime) precipitates.< Réduire

Mots clés en anglais

Additive Manufacturing

Strenghtening Models

High Entropy Alloys

Atom Probe Tomography

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Enhanced tensile yield strength in laser additively manufactured Al0.3CoCrFeNi high entropy alloy

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