4.7 Article

Additive manufacturing of Al0.3CoCrFeNi high-entropy alloy by powder feeding laser melting deposition

Journal

JOURNAL OF ALLOYS AND COMPOUNDS
Volume 862, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.158286

Keywords

High-entropy alloys; Laser melting deposition; Heating treatment; Mechanical properties

Funding

  1. National Natural Science Foundation of China [51505166]
  2. Guangxi Key Research and Development Program [Guike AB19050002]
  3. Science and Technology Plan Project of Shenzhen [JCYJ20180508151903646]
  4. Hunan Science Fund for Distinguished Young Scholars [2020JJ2046]
  5. Huxiang Young Talents [2018RS3007]

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Al0.3CoCrFeNi high-entropy alloy was additively manufactured by laser melting deposition, and its microstructure and tensile properties were studied. Thermal stress induced dislocation loops and cracks, leading to poor ductility in the samples, while annealing facilitated further precipitation of phases introducing hardening effects.
Al0.3CoCrFeNi high-entropy alloy (HEA) was additively manufactured by laser melting deposition (LMD) with emphasis on its microstructure and tensile properties. The LMD as-built HEA features a < 110 > fiber texture aligned toward the build direction. The dislocation loops are observed with a high density of dislocations neighboring to them in the LMDed samples. The partials dislocation glides induced by thermal stress leading to disordered-ordered transformation during LMD. Besides, the precipitated B2 particles are induced by thermal stress during cooling or thermal exposure during remelting. The cracks easily initiate and propagate along with the phase boundaries between the matrix FCC and precipitated B2 phases. Such cracks damage the tensile properties resulting in poor ductility in the tensile tests. Subsequent annealing facilitate the further precipitation of the B2 and sigma phase, which introduces hardening and leading to the increase of the Vickers hardness and wear resistance of the annealed samples. Nevertheless, the annealing induces dislocation recovery, which reduces the required critical shearing stress for plastic deformation. As a consequence, the yield stress decreases from 476.9 +/- 6.4-373.5 +/- 6.8 MPa after annealing. (C) 2020 Elsevier B.V. All rights reserved.

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