Compositional effects on ideal shear strength in Fe-Cr alloys

Casillas-Trujillo, Luis; Xu, Liubin; Xu, Haixuan

doi:10.1016/j.jallcom.2017.05.167

Cited by 7 publications

(9 citation statements)

References 47 publications

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“…3 are from indentation of grains with close to 100 out-of-plane orientation, and the main corresponding slip system is �111�{110} . In our study, the experimental τ max-pop is within 20% of the theoretical shear strength predicted by density functional theory calculations [43].…”

Section: Figuresupporting

confidence: 85%

“…3 can be attributed to two main factors: The first is that the ab initio calculations do not account for the triaxiality of the stress state beneath the indenter. This raises the ideal shear stress compared to the assumption made in [43] of a fully relaxed shear load. Revised ab initio analysis of W and Mo [44] showed that modelling a triaxial stress state will produce a theoretical shear strength that is 6-13% higher than the fully relaxed model.…”

Section: Figurementioning

confidence: 94%

“…The error bars show one standard deviation of the measurements. Density functional theory (DFT) calculations (black diamonds and crosses) [43] are included for comparison. A range of possible corrections have been applied to correlate the experimentally measured shear stress to theoretical calculations (blue), explanations are provided in the corresponding text.…”

Section: Figurementioning

confidence: 99%

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Deformation behaviour of ion-irradiated FeCr: A nanoindentation study

Song

Karamched

et al. 2022

Journal of Materials Research

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Understanding the mechanisms of plasticity in structural steels is essential for the operation of next-generation fusion reactors. This work on the deformation behaviour of FeCr, focusses on distinguishing the nucleation of dislocations to initiate plasticity, from their propagation through the material. Fe3Cr, Fe5Cr, and Fe10Cr were irradiated with 20 MeV Fe3+ ions at room temperature to doses of 0.008 dpa and 0.08 dpa. Nanoindentation was then carried out with Berkovich and spherical indenter tips. Our results show that the nucleation of dislocations is mainly from pre-existing sources, which are not significantly affected by the presence of irradiation defects or Cr%. Yield strength, an indicator of dislocation mobility, increases with irradiation damage and Cr content, while work hardening capacity decreases mainly due to irradiation defects. The synergistic effects of Cr and irradiation damage in FeCr appear to be more important for the propagation of dislocations than for their nucleation. Graphical abstract

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Section: Figuresupporting

confidence: 85%

Section: Figurementioning

confidence: 94%

Section: Figurementioning

confidence: 99%

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Deformation behaviour of ion-irradiated FeCr: A nanoindentation study

Song

Karamched

et al. 2022

Journal of Materials Research

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“…Experimental values shown in Figure 3 are only from indenting grains with close to 100 out-of-plane orientation, and the main corresponding slip system is 111 {110}. In our study, the experimental τ M U I is very close to the theoretical shear strength calculated from density functional theory [44]. One possible source of discrepancy could be variable surface roughness between samples.…”

Section: Pop-in Shear Stress Analysissupporting

confidence: 72%

Deformation Behaviour of Ion-Irradiated FeCr: A Nanoindentation Study

Song,

Yu,

Karamched

et al. 2021

Preprint

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Understanding the mechanisms of plasticity in structural steels is essential for the operation of next-generation fusion reactors. Elemental composition, particularly the amount of Cr present, and irradiation can have separate and synergistic effects on the mechanical properties of ferritic/martensitic steels. The study of ion-irradiated FeCr alloys is useful for gaining a mechanistic understanding of irradiation damage in steels. Previous studies of ion-irradiated FeCr did not clearly distinguish between the nucleation of dislocations to initiate plasticity, and their propagation through the material as plasticity progresses.In this study, Fe3Cr, Fe5Cr, and Fe10Cr were irradiated with 20 MeV Fe 3+ ions at room temperature to nominal doses of 0.01 dpa and 0.1 dpa. Nanoindentation was carried out with Berkovich and spherical indenter tips to study the nucleation of dislocations and their subsequent propagation. The presence of irradiation-induced defects reduced the theoretical shear stress and barrier for dislocation nucleation. The presence of Cr further enhanced this effect due to increased retention of irradiation defects. However, this combined effect is still small compared to dislocation nucleation from pre-existing sources such as Frank-Read sources and grain boundaries. The yield strength, an indicator of dislocation mobility, of FeCr increased with irradiation damage and Cr. The increased retention of irradiation defects due to the presence of Cr also further increased the yield strength. Reduced work hardening capacity was also observed following irradiation. The synergistic effects of Cr and irradiation damage in FeCr appear to be more important for the propagation of dislocations, rather than their nucleation.

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“…By means of a pulse-echo technique, Speich et al experimentally derived the bulk modulus (B), shear modulus (G), Young's modulus (E), and Poisson's ratio of several Fe-Cr alloys. [17] Moreover, the elastic constants (C 11 , C 12 , and C 44 ) and elastic moduli (G, B, E) of some Fe-Cr solid solutions are also calculated through first principles calculations [18,19]. As to the stress-strain relationships of Fe-Cr phases, however, there is no any theoretical or experimental report so far in the literature.…”

Section: Introductionmentioning

confidence: 99%

Heats of formation and stress–strain relationship of Fe–Cr solid solutions from a constructed Fe–Cr potential

Dong¹,

Jiang²,

Gong³

et al. 2022

J. Phys.: Condens. Matter

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A new Fe-Cr interatomic potential is constructed under the framework of the embedded-atom method and has better performances in predicting heats of formation and stress-strain relationship of Fe-Cr solid solutions than the Fe-Cr potentials already published in the literature. Based on the constructed Fe-Cr potential, molecular dynamics simulation reveals that the heats of formation of BCC Fe-Cr solid solutions at 1600 K are positive within the entire composition range, and the calculated values are in good agreement with corresponding experimental measurements in the literature. In addition, it is also found that the tensile strengths of BCC Fe-Cr solid solutions increase with the increase of the Cr composition, and that BCC Fe-Cr solid solutions are less ductile with smaller critical strains than both Fe and Cr. The simulated results are discussed and compared with the corresponding experimental and calculated evidence in the literature to validate the relevance of the newly constructed Fe-Cr potential.

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Compositional effects on ideal shear strength in Fe-Cr alloys

Cited by 7 publications

References 47 publications

Deformation behaviour of ion-irradiated FeCr: A nanoindentation study

Deformation behaviour of ion-irradiated FeCr: A nanoindentation study

Deformation Behaviour of Ion-Irradiated FeCr: A Nanoindentation Study

Heats of formation and stress–strain relationship of Fe–Cr solid solutions from a constructed Fe–Cr potential

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