Segregation enabled outstanding combination of mechanical and corrosion properties in a FeCrNi medium entropy alloy manufactured by selective laser melting

被引：10

作者：

Heng Duan ^{[1
]}

Bin Liu ^{[1
]}

Ao Fu ^{[1
]}

Junyang He ^{[1
,2
]}

Tao Yang ^{[3
]}

CTLiu ^{[3
,4
]}

Yong Liu ^{[1
]}

机构：

[1] State Key Lab of Powder Metallurgy, Central South University

[2] Max-Planck-Institut für Eisenforschung

[3] Department of Materials Science and Engineering, City University of Hong Kong

[4] Department of Mechanical Engineering, City University of Hong Kong

来源：

Journal of Materials Science & Technology | 2022年 / 99卷 / 04期

关键词：

D O I：

暂无

中图分类号：

TG139 [其他特种性质合金]; TG665 [光能加工设备及其加工];

学科分类号：

080502 ; 080201 ;

摘要：

Selective laser melting（SLM） has the advantage in preparing supersaturated solid solutions due to its unique thermal field and high solidification rate. In this study, a face-centered cubic single-phase FeCrNi medium entropy alloy（MEA） with an ultrahigh Cr content（～35 at.%） was additively manufactured by SLM. The as-built MEA shows a hierarchical microstructure of coarse columnar grains and submicron dislocation cell structures, where the cell boundaries are probed segregated with Cr and C and decorated with nano carbides. The appearance of these dislocation barriers results in an excellent combination of strength(σ0.2=745 MPa, σUTS=1007 MPa) and ductility（ε_f=31%）. The current MEA also shows a superb corrosion resistance with a corrosion current density of 0.06 μA cm-2 in 3.5 wt.% NaCl solution, which is far lower than that of 316 L. The high content of solutioned Cr in the MEA ensures sufficient Cr supply to form an integrated Cr2O3 passive film, and the large number of cell boundaries acting as the diffusion channels lead to the fast formation of a stable passive film over the alloy surface.

引用

页码：207 / 214

页数：8

共 41 条

[1]

Microstructure and mechanical properties of oxide dispersion strengthened FeCoNi concentrated solid solution alloys[J] . Yuanhang Guo,Mingyang Li,Pei Li,Cunguang Chen,Qian Zhan,Yongqin Chang,Yanwen Zhang.Journal of Alloys and Compounds . 2020 (C)

[2]

Effects of annealing on the structure and mechanical properties of FeCoCrNi high-entropy alloy fabricated via selective laser melting[J] . Danyang Lin,Lianyong Xu,Hongyang Jing,Yongdian Han,Lei Zhao,Fumiyoshi Minami.Additive Manufacturing . 2020 (C)

[3]

The corrosion behavior of ultra-fine grained CoNiFeCrMn high-entropy alloys[J] . Zhenhua Han,Weining Ren,Jun Yang,Ali Tian,Yuzhou Du,Gang Liu,Ran Wei,Guojun Zhang,Yuanqing Chen.Journal of Alloys and Compounds . 2020 (C)

[4]

Mechanical properties and deformation behavior of dual-phase Al 0.6 CoCrFeNi high-entropy alloys with heterogeneous structure at room and cryogenic temperatures[J] . Q. Li,T.W. Zhang,J.W. Qiao,S.G. Ma,D. Zhao,P. Lu,Z.H. Wang.Journal of Alloys and Compounds . 2020 (C)

[5]

The significance of spatial length scales and solute segregation in strengthening rapid solidification microstructures of 316L stainless steel[J] . Tatu Pinomaa,Matti Lindroos,Martin Walbrühl,Nikolas Provatas,Anssi Laukkanen.Acta Materialia . 2020 (C)

[6]

Surface microstructure modification of hypereutectic Nb-Si based alloys to improve oxidation resistance without damaging fracture toughness[J] . Yueling Guo,Zhiming Li,Junyang He,Haijun Su,Lina Jia,Jun Zhang,Lin Liu,Hu Zhang.Materials Characterization . 2020 (C)

[7]

Phase evolution, microstructure, and mechanical behaviors of the CrFeNiAl x Ti y medium-entropy alloys[J] . Mengdi Zhang,Yimo Ma,Wanqing Dong,Xingshuo Liu,Ye Lu,Yifei Zhang,Rui Li,Yongyong Wang,Pengfei Yu,Yunpeng Gao,Gong Li.Materials Science ＆ Engineering A . 2020 (C)

[8]

Deformation induced grain boundary segregation in nanolaminated Al–Cu alloy[J] . W. Xu,X.C. Liu,X.Y. Li,K. Lu.Acta Materialia . 2020 (C)

[9]

A novel supersaturated medium entropy alloy with superior tensile properties and corrosion resistance[J] . Ao Fu,Bin Liu,Wenjun Lu,Bo Liu,Jia Li,Qihong Fang,Zhiming Li,Yong Liu.Scripta Materialia . 2020 (C)

[10]

Segregation-driven grain boundary spinodal decomposition as a pathway for phase nucleation in a high-entropy alloy[J] . Linlin Li,Zhiming Li,Alisson Kwiatkowski da Silva,Zirong Peng,Huan Zhao,Baptiste Gault,Dierk Raabe.Acta Materialia . 2019 (C)

← 1 2 3 4 5 →