CHESETTI, Advika; BANERJEE, Sucharita; DASARI, Sriswaroop; NARTU, Mohan Sai Kiran; VARAHABHATLA, S.M.; SHARMA, Abhishek; RAMAKRISHNAN, Abhishek; SATKO, Daniel; GORSSE, Stephane; SALEM, Ayman; BANERJEE, Rajarshi

doi:10.1016/j.scriptamat.2022.115160

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CHESETTI, Advika
Department of Materials Science and Engineering
Center for Agile and Adaptive Manufacturing [CAAAM]

BANERJEE, Sucharita
Center for Agile and Adaptive Manufacturing [CAAAM]
University of Texas at Austin [Austin]

DASARI, Sriswaroop
Department of Materials Science and Engineering

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Scripta Materialia. 2023-03-01, vol. 225, p. 115160 (8 p.)

Elsevier

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While complex concentrated alloys (CCAs), involving a large fraction of refractory elements, are promising candidates for structural applications, their relatively high densities, processing challenges, and low plasticity, has retarded their development. Here, we report a 3D printable lowdensity precipitation strengthened CCA of composition, Al10Nb15Ta5Ti30Zr40. The chemical homogeneity in the alloy deposited using laser bed powder fusion process is substantially better as compared to the as-cast ingot. This homogeneity is attributed to the enhanced solubility at the high temperatures experienced during laser melting, small melt pool dimensions, and the high cooling rates. The as-built CCA exhibited an excellent balance of room temperature mechanical properties, a compressive yield stress ~1400 MPa, peak stress ~1700 MPa, and plastic strain exceeding 45%. These properties can be attributed to its unique as-processed microstructure consisting of refined grains incorporating a high density of sub-grain boundaries, containing a nanoscale two-phase mixture of an ordered B2 and disordered BCC solid solution phases.< Leer menos

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Refractory high entropy alloys laser additive manufacturing laser powder bed fusion microstructure mechanical properties

Refractory high entropy alloys

laser additive manufacturing

laser powder bed fusion

microstructure

mechanical properties

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3D printable low density B2+BCC refractory element based complex concentrated alloy with excellent balance of mechanical properties

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