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Laser metal deposition of refractory high-entropy alloys for high-throughput synthesis and structure-property characterization

Journal Article · · International Journal of Extreme Manufacturing

Progress in materials development is often paced by the time required to produce and evaluate a large number of alloys with different chemical compositions. This applies especially to refractory high-entropy alloys (RHEAs), which are difficult to synthesize and process by conventional methods. To evaluate a possible way to accelerate the process, high-throughput laser metal deposition was used in this work to prepare a quinary RHEA, TiZrNbHfTa, as well as its quaternary and ternary subsystems by in-situ alloying of elemental powders. Compositionally graded variants of the quinary RHEA were also analyzed. Our results show that the influence of various parameters such as powder shape and purity, alloy composition, and especially the solidification range, on the processability, microstructure, porosity, and mechanical properties can be investigated rapidly. The strength of these alloys was mainly affected by the oxygen and nitrogen contents of the starting powders, while substitutional solid solution strengthening played a minor role.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Ruhr Univ., Bochum (Germany)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; German Research Foundation
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1860602
Journal Information:
International Journal of Extreme Manufacturing, Journal Name: International Journal of Extreme Manufacturing Journal Issue: 1 Vol. 3; ISSN 2631-8644
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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