Journal
MATERIALS LETTERS
Volume 317, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2022.132092
Keywords
Eutectic high-entropy alloys; Laser melting deposition; Additive manufacturing; Microstructure; Herringbone structure
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In this study, laser melting deposition (LMD) was used to successfully form AlCoCrFeNi2.1 eutectic high-entropy alloys (EHEAs) to solve formability issues. By retaining the eutectic structure and forming a characteristic herringbone structure, the mechanical properties of the as-deposited alloy are significantly improved.
In this study, laser melting deposition (LMD) was used to form AlCoCrFeNi2.1 eutectic high-entropy alloys (EHEAs) to solve the formability problems. EHEAs were prepared with laser power of 600 W, scanning rate of 4 mm/s, powder feeding rate of 8 g/min. The microstructure and mechanical properties of the as-deposited alloy and the as-cast alloy were evaluated. The eutectic structure containing L1(2) and B2 phases is retained and grows along the deposition direction to form a characteristic herringbone structure. This characteristic structure makes the mechanical properties of the as-deposited alloy (sigma(b) = 1097 +/- 9 MPa, delta = 22 +/- 2% in vertical; sigma(b) = 996 +/- 6 MPa, delta = 14 +/- 2% in horizontal) are significantly improved compared to the as-cast alloy (sigma(b) = 980 +/- 6 MPa, delta = 14 +/- 2%).
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