Assimilated model of work-hardening in FCC metals and its application to devolution of stored work

Saimoto, S.; Diak, B.J.; Kula, A.; Niewczas, M.

doi:10.1016/j.mtcomm.2022.105115

Cited by 3 publications

(7 citation statements)

References 33 publications

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“…Thus the total density is equal to 2 ρ rep . The new assimilated model of work hardening has shown that 1/A corresponds to (ρ rep + ρ att ) and the ratio of total density ρ total to ρ rep was found to be 2.0 as predicted by the model [12].…”

Section: Theoretical Basis Of Thermodynamic Strain Rate Sensitivitymentioning

confidence: 77%

“…The issue that arises is that if the flow stress is due to only the repulsive intersections, the dislocation density calculations from τ = αµbρ 1/2 neglects the attractive intersection dislocations which is expected to occur in equal amounts. This dilemma was resolved [12] by realizing that forward glide dislocations confronting repulsive forest dislocations also interact with attractive ones that act as weak obstacles, but for dislocations gliding in the opposite direction, the attractive become repulsive in nature. Hence, the flow stress represents both the repulsive and attractive forest densities; that is τ rep = α µ b ρ rep 1/2 simultaneously apply to both positive and negative Burgers vectors.…”

Section: Theoretical Basis Of Thermodynamic Strain Rate Sensitivitymentioning

confidence: 99%

“…The reduced effect for free-GB one indicates that pipe diffusion is transporting the vacancies produced at the site of dislocation intersections to sinks in the grain boundaries. Recent realization that heat-flow generated upon plastic flow is due to dynamic dislocation annihilation from coplanar slip [12] suggests that vacancies created near the dislocation cores at intersection sites are stranded upon dislocation line annihilation, which can then migrate to or are swept up by dislocations. This effect will be enhanced if there were no sinks for vacancies and will become distributed in the matrix to increase super-saturation.…”

Section: Migration Of Deformation-produced Vacancies To Various Sinks...mentioning

confidence: 99%

“…125-195 K: T pipe = 125 K and at 195 K pipe diffusion occurs to re-distribute the vacancies created at the intersection sites. If pipe diffusion mobility can keep pace with the dislocation movement or dislocation line become stationary upon intersection, vacancies are stranded upon coplanar dislocation annihilation [12,37]. This mechanism is the main source of vacancy super-saturation in fcc metals since jog-dragging primarily results in faulted loops rather than vacancies.…”

Section: Synopsis Of Forensic Survey Of Vacancy Creation At Dislocati...mentioning

confidence: 99%

“…A new assimilated model of work-hardening of fcc metals mainly based on continuous tensile test results of super-pure copper was recently proposed by Saimoto et al [12,37]. The parameters to replicate the measured stress-strain response are dynamic in nature and results in a constitutive relation characterized by two power-law fitting curves the intersections of which were designated by τ 3 and γ 3 , τ 3 correlate to (σ 3 /M).…”

Section: Role Of Attractive Junctions In Work-hardeningmentioning

confidence: 99%

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Rate-Controlling Microplastic Processes during Plastic Flow in FCC Metals: Origin of the Variation of Strain Rate Sensitivity in Aluminum from 78 to 300 K

2022

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The thermodynamic response of dislocation intersections with forest dislocations and other deformation products is recorded using the Eyring rate relation wherein the application of shear stress increases the probability of activation at a given strain rate and temperature. The inverse activation volume, 1/ν, can be directly determined by instantaneous strain-rate change and its dependence on flow stress, τ, defines the strain-rate sensitivity, S, through the Haasen plot slope. A linear slope over a large strain interval is observed even for a heterogeneous distribution of obstacles that could be of more than one type of obstacles encountered by the gliding dislocation. It was deduced that ν and τ at each activation site are coordinated by the internal stress resulting in constant activation work (k/S). The stress changes from down-rate changes become larger than that from up-rate changes due to the formation of weaker obstacles, resulting in a composite S, whereas only forest dislocations are detected by the up-change. The additivity of 1/ν was used to separate obstacle species in specially prepared AA1100 and super-pure aluminum from 78 to 300 K. The deduction that repulsive intersection is the rate-controlling process and creates vacancies at each intersection site depending on temperature was validated by observing the pinning and depinning of dislocations via pipe diffusion above 125 K. A new method to separate S for dislocation-dislocation intersections from the intersections with other obstacles and their temperature dependence is presented and validated.

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Section: Theoretical Basis Of Thermodynamic Strain Rate Sensitivitymentioning

confidence: 77%

Section: Theoretical Basis Of Thermodynamic Strain Rate Sensitivitymentioning

confidence: 99%

Section: Migration Of Deformation-produced Vacancies To Various Sinks...mentioning

confidence: 99%

Section: Synopsis Of Forensic Survey Of Vacancy Creation At Dislocati...mentioning

confidence: 99%

Section: Role Of Attractive Junctions In Work-hardeningmentioning

confidence: 99%

See 3 more Smart Citations

Rate-Controlling Microplastic Processes during Plastic Flow in FCC Metals: Origin of the Variation of Strain Rate Sensitivity in Aluminum from 78 to 300 K

2022

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Decoding stress-strain parameters in FCC metals using digital constitutive analyses to devolve dynamic obstacle-strength factor and diffuse necking

Saimoto,

Inal,

Diak

et al. 2024

Materialia

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Hardening Behavior and Model of a 316L Sheet Considering Macro and Micro Size Effects

Zhang,

Meng,

Luo

2023

Metals

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316L stainless steel is often used as the metal bipolar plate, which is a key component of fuel cells. For the thinner metal bipolar plates, the mechanical properties may be different for different specimen sizes. In this paper, the mechanical properties, metallographic structure, and hardening behavior of 316L stainless steel sheets with different grain sizes and specimen thickness were studied. Several mathematical models were selected to describe the hardening behavior of 316L stainless steel sheet. A correlated hardening model of 316L stainless steel was established, considering the specimen and grain size effect. The results show that the specimen thickness has no effect on the microstructure and grain size, but the austenite grain size increases gradually with an increase in holding time. With a decrease in plate thickness and an increase in grain size, the strength decreases. Compared to the 0.1 mm sheet, the yield strength and tensile strength for the 0.9 mm sheet are increased by 48% and 24%, respectively. The yield strength and tensile strength are decreased by nearly half after 20 min heat treatment due to the grain size growth. The thicker the sample and higher the grain size is, the higher the hardening rate is. The predicted stress–strain by established correlated hardening model has a good agreement with the experiment curves.

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Assimilated model of work-hardening in FCC metals and its application to devolution of stored work

Cited by 3 publications

References 33 publications

Rate-Controlling Microplastic Processes during Plastic Flow in FCC Metals: Origin of the Variation of Strain Rate Sensitivity in Aluminum from 78 to 300 K

Rate-Controlling Microplastic Processes during Plastic Flow in FCC Metals: Origin of the Variation of Strain Rate Sensitivity in Aluminum from 78 to 300 K

Decoding stress-strain parameters in FCC metals using digital constitutive analyses to devolve dynamic obstacle-strength factor and diffuse necking

Hardening Behavior and Model of a 316L Sheet Considering Macro and Micro Size Effects

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