4.7 Article

Promoting columnar-to-equiaxed transition in AlCoCrFeNi high entropy alloy during selective laser melting by adding Cr3C2

Journal

MATERIALS RESEARCH LETTERS
Volume 10, Issue 12, Pages 788-796

Publisher

TAYLOR & FRANCIS INC
DOI: 10.1080/21663831.2022.2106798

Keywords

Selective laser melting; high entropy alloy; columnar-to-equiaxed transition; grain refinement; segregation

Funding

  1. National Key Research and Development Program of China from the Ministry of Science and Technology of the People's Republic of China [2018YFB0703400]

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The addition of 5% Cr3C2 particles into AlCoCrFeNi high entropy alloy enabled full columnar-to-equiaxed grain transition and significant grain refinement during the process of selective laser melting.
The 5 at% Cr3C2 particles were mixed with AlCoCrFeNi high entropy alloy powder particles and then selectively laser melted. The addition caused full columnar-to-equiaxed grain transition (CET) and significant grain refinement. The inter-dendritic regions and grain boundaries (GBs) of the as-fabricated sample were segregated with Cr and C, which led to the formation of an FCC belt/network structure along GBs. The grain interior was dominated by BCC/B2 and sporadically decorated by Cr7C3 particles. The partitioning of Cr and C into liquid ahead of the solidification front, which may have generated significant constitutional supercooling, is believed to be responsible for the full CET. IMPACT STATEMENT The present study introduces a small fraction of Cr3C2 particles into AlCoCrFeNi high entropy alloy and successfully enables full columnar-to-equiaxed grain transition and significant grain refinement during selective laser melting.

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