Grain size effect on near-threshold fatigue crack propagation in CrMnFeCoNi high-entropy alloy fabricated by spark plasma sintering

Fujita, Kazuhiko; Tsuboi, Hayato; Kikuchi, Shinichi

doi:10.1016/j.engfracmech.2023.109317

Cited by 8 publications

(1 citation statement)

References 30 publications

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“…Lu [21] reported on cohesive zone modeling for crack propagation in polycrystalline NiTi alloys. Fujita et al [22] studied the grain size effect on near-threshold fatigue crack propagation in CrMnFeCoNi high-entropy alloy fabricated by spark plasma sintering. Chlup et al [23] studied fatigue behavior and crack initiation in CoCrFeNiMn high-entropy alloy processed by powder metallurgy.…”

Section: Introductionmentioning

confidence: 99%

Crack growth and fracture mechanics of CuCrFeNiCo high-entropy alloy during tension testing

Tran,

Chu,

Trinh

et al. 2024

Phys. Scr.

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In this work, the crack growth and fracture mechanics of CuCrFeNiCo high-entropy alloy (HEA) during tension process are studied through molecular dynamics simulation method. The single-crystalline, nanocrystalline, and twinned-nanocrystalline CuCrFeNiCo HEA samples with an initial crack are prepared. The influences of boundary conditions, crack length and crystallographic orientation are considered in detail. The results indicate that the phase transition from face-centered cubic (FCC) structure into hexagonal close-packed (HCP) structure and the appearance of Shockley dislocations are the majority in all samples. The dislocations appear most densely in the twinned-nanocrstalline sample and most sparsely in the single-crystalline sample. The growth of the initial crack combined with the formation and expansion of new cracks along the grain boundaries (GBs) is the determining factor in the fracture mechanics of the CuCrFeNiCo HEA samples. The deformation capacity of the samples with free boundary conditions along the y-axis is better and the plastic deformation process is longer than the samples with periodic boundary conditions along the y-axis. The tensile strength values of the CuCrFeNiCo HEA samples change significantly in the range from 2.61 GPa to 7.75 GPa when changing the simulation conditions. The von Mises stress in the grains is markedly lower than that in the GBs.

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Section: Introductionmentioning

confidence: 99%

Crack growth and fracture mechanics of CuCrFeNiCo high-entropy alloy during tension testing

Tran,

Chu,

Trinh

et al. 2024

Phys. Scr.

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The influence of shot peening on mechanical properties, wear, and corrosion resistance of 42CrMo steel

Sun,

2024

Int J Adv Manuf Technol

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Effects of Defects and Shot Peening on Fatigue Properties of Additively Manufactured CoCrFeNiTiMo-Based High-Entropy Alloys

Hayashi,

Kurita,

Watanabe

et al. 2024

J. of Materi Eng and Perform

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Recently, the automotive industry has increasingly focused on additive manufacturing as a new technology for reducing the weights of automobiles. In this study, fatigue tests were conducted on additively manufactured high-entropy alloys with different defect characteristics to clarify the relationships between their defect characteristics and fatigue strengths and to elucidate their fatigue fracture mechanisms. In addition, the effect of shot peening as an effective fatigue strength improvement method for an additively manufactured component was investigated. As a result, when defects formed by additive manufacturing were smaller than crystal grains, the numbers and sizes of defects affect fatigue crack growth behavior and barely affect fatigue life. Shot peening reduces the crack growth rate and is effective in extending the fatigue life. However, improvement in the fatigue limit is not achieved because the crack initiation site is a facet. From the above results, for defects smaller than the grain size, shot peening is a more effective method for improving fatigue life than reducing the numbers and sizes of defects.

show abstract

Grain size effect on near-threshold fatigue crack propagation in CrMnFeCoNi high-entropy alloy fabricated by spark plasma sintering

Cited by 8 publications

References 30 publications

Crack growth and fracture mechanics of CuCrFeNiCo high-entropy alloy during tension testing

Crack growth and fracture mechanics of CuCrFeNiCo high-entropy alloy during tension testing

The influence of shot peening on mechanical properties, wear, and corrosion resistance of 42CrMo steel

Effects of Defects and Shot Peening on Fatigue Properties of Additively Manufactured CoCrFeNiTiMo-Based High-Entropy Alloys

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