The effect of Co and Cr substitutions for Ni on mechanical properties and plastic deformation mechanism of FeMnCoCrNi high entropy alloys

Zhang，H. F.1; Yan，H. L.2; Yu，H.1,3,4; Ji，Z. W.5; Hu，Q. M.3; Jia，N.1

2020-07-01

10.1016/j.jmst.2020.03.010

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY   影响因子和分区

1005-0302

The elastic constants, ideal tensile strength (ITS), stacking fault energy (SFE), lattice constant and magnetic moment of FeMnCoCrNi high entropy alloys with varying Co and Cr contents at 0 and 300 K were systematically investigated by first-principle calculations. For the alloys with Co substitution for Ni, at both temperatures the elastic stability of the face-centered cubic (fcc) phase, bulk elastic modulus (B), Young's modulus (E), shear modulus (G) and ITS increase monotonically with increasing Co content. However, the Cauchy pressure (C), Pugh ratio (B/G), Poisson ratio (v), Zener anisotropy ratio (A) and elastic anisotropy ratio (A) decrease monotonically. The SFE also decreases with the increase of Co, resulting in the change of plastic deformation mechanism from dislocation slip to mechanical twinning, and then to hcp-martensitic transformation. This elucidates the underlying mechanism of the effect of Co addition on the strength and micromechanical behavior of FeMnCoCrNi alloys. Compared with Co, the Cr substitution for Ni leads to the more complex change of elastic constants and ITS. The increase of Cr shows the similar effect on SFE and deformation mechanism as that of Co. The variation of valence electron concentration and magnetism affect the SFE. The increase of either Co or Cr leads to the reduced magnetic moments of Fe and Mn. This could be responsible for the monotonic decrease of both lattice constant and SFE as the Co content increases. However, for the Cr addition case, multiple factors may affect the evolution of lattice constant and SFE. These findings shed light on the deformation mechanism of the alloys with different compositions.

Elastic constants First-principle calculations High entropy alloys Ideal tensile strength Stacking fault energy

SCI ; EI

英语

其他

National Natural Science Foundation of China[51922026][51571057] ; Fundamental Research Funds for the Central Universities[N2002005][N2007011] ; Liaoning Natural Science Foundation[20180510010]

Materials Science ; Metallurgy & Metallurgical Engineering

Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:000534323200019

JOURNAL MATER SCI TECHNOL

20201308348695

Cobalt alloys ; Elastic moduli ; Anisotropy ; High-entropy alloys ; Martensitic transformations ; Entropy ; Lattice constants ; Plastic deformation ; Magnetic moments ; Cobalt ; Tensile strength

Metallurgy and Metallography:531 ; Metallography:531.2 ; Chromium and Alloys:543.1 ; Iron Alloys:545.2 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Thermodynamics:641.1 ; Magnetism: Basic Concepts and Phenomena:701.2 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Crystal Lattice:933.1.1 ; Materials Science:951

MATERIALS SCIENCE

2-s2.0-85082136092

Scopus

1.Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education),School of Material Science and Engineering,Northeastern University,Shenyang,110819,China
2.State Key Lab Rolling & Automat,Northeastern University,Shenyang,110819,China
3.Institute of Metal Research,Chinese Academy of Science,Shenyang,110016,China
4.Shen Yang University of Technology,Shenyang,110870,China
5.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Zhang，H. F.,Yan，H. L.,Yu，H.,et al. The effect of Co and Cr substitutions for Ni on mechanical properties and plastic deformation mechanism of FeMnCoCrNi high entropy alloys[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2020,48:146-155.

Zhang，H. F.,Yan，H. L.,Yu，H.,Ji，Z. W.,Hu，Q. M.,&Jia，N..(2020).The effect of Co and Cr substitutions for Ni on mechanical properties and plastic deformation mechanism of FeMnCoCrNi high entropy alloys.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,48,146-155.

Zhang，H. F.,et al."The effect of Co and Cr substitutions for Ni on mechanical properties and plastic deformation mechanism of FeMnCoCrNi high entropy alloys".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 48(2020):146-155.