Ordered nitrogen complexes overcoming strength–ductility trade-off in an additively manufactured high-entropy alloy

Zhao，Dandan1,2; Yang，Quan1; Wang，Dawei3; Yan，Ming3; Wang，Pei1; Jiang，Mingguang1; Liu，Changyong1; Diao，Dongfeng4; Lao，Changshi1; Chen，Zhangwei1; Liu，Zhiyuan1; Wu，Yuan5; Lu，Zhaoping5

2020

10.1080/17452759.2020.1840783

Virtual and Physical Prototyping   影响因子和分区

1745-2759

1745-2767

Strength and ductility were simultaneously enhanced in the additively manufactured CoCrFeMnNi high-entropy alloy by laser powder bed fusion (LBPF) under reactive N atmosphere. It was found that nitrogen atoms picked up during additive manufacturing line-up to form ordered nitrogen complexes (ONCs) in the octahedral interstitial position of the HEA matrix. Dislocation multiplication is then facilitated by the formation of ONCs during LPBF, leading to a higher dislocation density with smaller dislocation cells. Dislocation strengthening, combined with interstitial strengthening, endows the additively manufactured HEA with the yielding strength of 690 MPa, 15% higher than that of the counterparts fabricated under inert atmosphere. More interestingly, the ONCs stimulate dislocation nucleation and engender more heterogeneous microstructure, giving rise to an outstanding ductility of 15.3%, with an increment of 34%. As a result, the strength–ductility trade-off was successfully reversed by the nitrogen doping during LPBF under reactive atmosphere.

High-entropy alloys laser powder bed fusion ordered nitrogen complexes reactive atmosphere

SCI ; EI

英语

其他

National Natural Science Foundation of China[51971149][51971108] ; China Postdoctoral Science Foundation[2020M672789] ; Natural Science Foundation of Guangdong Province[2019A1515110515][2019A1515110541] ; Shenzhen Science and Technology Innovation Commission of Shenzhen[KQJSCX20180328095612712][GJHZ20190822095418365]

Engineering ; Materials Science

Engineering, Manufacturing ; Materials Science, Multidisciplinary

WOS:000592498700001

TAYLOR & FRANCIS LTD

20204709504093

Chromium alloys ; Cobalt alloys ; Ductility ; Entropy ; Manganese alloys ; Additives ; Economic and social effects ; Iron alloys

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 ; Chemical Agents and Basic Industrial Chemicals:803 ; Materials Science:951 ; Social Sciences:971

2-s2.0-85096105917

Scopus

1.Additive Manufacturing Institute,College of Mechatronics and Control Engineering,Shenzhen University,Shenzhen,China
2.College of Physics and Optoelectronic Engineering,Shenzhen University,Shenzhen,China
3.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,China
4.Institute of Nanosurface Science and Engineering,Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering,Shenzhen University,Shenzhen,China
5.Beijing Advanced Innovation Center for Materials Genome Engineering,State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing,China

Zhao，Dandan,Yang，Quan,Wang，Dawei,等. Ordered nitrogen complexes overcoming strength–ductility trade-off in an additively manufactured high-entropy alloy[J]. Virtual and Physical Prototyping,2020,15:532-542.

Zhao，Dandan.,Yang，Quan.,Wang，Dawei.,Yan，Ming.,Wang，Pei.,...&Lu，Zhaoping.(2020).Ordered nitrogen complexes overcoming strength–ductility trade-off in an additively manufactured high-entropy alloy.Virtual and Physical Prototyping,15,532-542.

Zhao，Dandan,et al."Ordered nitrogen complexes overcoming strength–ductility trade-off in an additively manufactured high-entropy alloy".Virtual and Physical Prototyping 15(2020):532-542.