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

Chen，Peng1,2; Yang，Chao3; Li，Sheng2; Attallah，Moataz M.2; Yan，Ming1

2020-09-01

10.1016/j.matdes.2020.108966

Materials and Design   影响因子和分区

0264-1275

1873-4197

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.

Additive manufacturing Deformation behaviour High entropy alloys Orowan strengthening Powder bed fusion

SCI ; EI

英语

第一

Shenzhen Science and Technology Innovation Commission[ZDSYS201703031748354][JCYJ20170817110358927] ; Science and Technology Planning Project of Guangdong Province of China[2017B090911003] ; Natural Science Foundation of Guangdong Province[2016A030313756]

Materials Science

Materials Science, Multidisciplinary

WOS:000569882500007

ELSEVIER SCI LTD

20203008965774

Cobalt alloys ; Tensile strength ; Chromium alloys ; High-entropy alloys ; Ductility ; Dispersions ; Manganese alloys ; Entropy ; Deformation ; Iron alloys ; Dissolved oxygen

Metallurgy and Metallography:531 ; Chromium and Alloys:543.1 ; Manganese and Alloys:543.2 ; Iron Alloys:545.2 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Thermodynamics:641.1 ; Printing Equipment:745.1.1 ; Materials Science:951

MATERIALS SCIENCE

2-s2.0-85088086585

Scopus

1.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.School of Metallurgy and Materials,University of Birmingham,Birmingham,B15 2TT,United Kingdom
3.School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou,510641,China

Chen，Peng,Yang，Chao,Li，Sheng,et al. In-situ alloyed, oxide-dispersion-strengthened CoCrFeMnNi high entropy alloy fabricated via laser powder bed fusion[J]. Materials and Design,2020,194.

Chen，Peng,Yang，Chao,Li，Sheng,Attallah，Moataz M.,&Yan，Ming.(2020).In-situ alloyed, oxide-dispersion-strengthened CoCrFeMnNi high entropy alloy fabricated via laser powder bed fusion.Materials and Design,194.

Chen，Peng,et al."In-situ alloyed, oxide-dispersion-strengthened CoCrFeMnNi high entropy alloy fabricated via laser powder bed fusion".Materials and Design 194(2020).