In-situ alloyed, oxide-dispersion-strengthened CoCrFeMnNi high entropy alloy fabricated via laser powder bed fusion

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In-situ alloyed, oxide-dispersion-strengthened CoCrFeMnNi high entropy alloy fabricated via laser powder bed fusion. / Chen, Peng; Yang, Chao; Li, Sheng; Attallah, Moataz M.; Yan, Ming.

In: Materials and Design, Vol. 194, 108966, 09.2020.

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@article{3f4eac6c444841ff8169cb216cfd5b9d,
title = "In-situ alloyed, oxide-dispersion-strengthened CoCrFeMnNi high entropy alloy fabricated via laser powder bed fusion",
abstract = "By using a blend of pre-alloyed CoCrFeNi powder and elemental Mn powder, quasi-equiatomic CoCrFeMnNi high entropy alloy (HEA) has been in-situ alloyed via laser powder bed fusion (LPBF). Besides being homogeneously dissolved into the HEA matrix, Mn also forms oxide particles with oxygen originating from both powder feedstock and printing atmosphere, resulting in an in-situ alloyed, oxide-dispersion-strengthened (ODS) HEA. The tensile strength of the ODS HEA is significantly improved to a yield strength of 620 MPa and a tensile strength of 730 MPa. The tensile ductility of the ODS HEA is lower than the ones prepared by using fully pre-alloyed powders, but an outstanding compression ductility maintains for the ODS HEA. The deforming behaviour of the alloy has been revealed, and the contribution of Orowan strengthening has been quantified along with other mechanisms. The study provides an approach to developing advanced HEAs with high strength and moderate ductility by LPBF.",
keywords = "Additive manufacturing, Deformation behaviour, High entropy alloys, Orowan strengthening, Powder bed fusion",
author = "Peng Chen and Chao Yang and Sheng Li and Attallah, {Moataz M.} and Ming Yan",
year = "2020",
month = sep,
doi = "10.1016/j.matdes.2020.108966",
language = "English",
volume = "194",
journal = "Materials and Design",
issn = "0264-1275",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - In-situ alloyed, oxide-dispersion-strengthened CoCrFeMnNi high entropy alloy fabricated via laser powder bed fusion

AU - Chen, Peng

AU - Yang, Chao

AU - Li, Sheng

AU - Attallah, Moataz M.

AU - Yan, Ming

PY - 2020/9

Y1 - 2020/9

N2 - By using a blend of pre-alloyed CoCrFeNi powder and elemental Mn powder, quasi-equiatomic CoCrFeMnNi high entropy alloy (HEA) has been in-situ alloyed via laser powder bed fusion (LPBF). Besides being homogeneously dissolved into the HEA matrix, Mn also forms oxide particles with oxygen originating from both powder feedstock and printing atmosphere, resulting in an in-situ alloyed, oxide-dispersion-strengthened (ODS) HEA. The tensile strength of the ODS HEA is significantly improved to a yield strength of 620 MPa and a tensile strength of 730 MPa. The tensile ductility of the ODS HEA is lower than the ones prepared by using fully pre-alloyed powders, but an outstanding compression ductility maintains for the ODS HEA. The deforming behaviour of the alloy has been revealed, and the contribution of Orowan strengthening has been quantified along with other mechanisms. The study provides an approach to developing advanced HEAs with high strength and moderate ductility by LPBF.

AB - By using a blend of pre-alloyed CoCrFeNi powder and elemental Mn powder, quasi-equiatomic CoCrFeMnNi high entropy alloy (HEA) has been in-situ alloyed via laser powder bed fusion (LPBF). Besides being homogeneously dissolved into the HEA matrix, Mn also forms oxide particles with oxygen originating from both powder feedstock and printing atmosphere, resulting in an in-situ alloyed, oxide-dispersion-strengthened (ODS) HEA. The tensile strength of the ODS HEA is significantly improved to a yield strength of 620 MPa and a tensile strength of 730 MPa. The tensile ductility of the ODS HEA is lower than the ones prepared by using fully pre-alloyed powders, but an outstanding compression ductility maintains for the ODS HEA. The deforming behaviour of the alloy has been revealed, and the contribution of Orowan strengthening has been quantified along with other mechanisms. The study provides an approach to developing advanced HEAs with high strength and moderate ductility by LPBF.

KW - Additive manufacturing

KW - Deformation behaviour

KW - High entropy alloys

KW - Orowan strengthening

KW - Powder bed fusion

UR - http://www.scopus.com/inward/record.url?scp=85088086585&partnerID=8YFLogxK

U2 - 10.1016/j.matdes.2020.108966

DO - 10.1016/j.matdes.2020.108966

M3 - Article

AN - SCOPUS:85088086585

VL - 194

JO - Materials and Design

JF - Materials and Design

SN - 0264-1275

M1 - 108966

ER -