The effect of strain-rate on the cyclic deformation properties of α-iron single crystals

Mughrabi, H.; Herz, K; Stark, X.

doi:10.1016/0001-6160(76)90086-9

Cited by 127 publications

(42 citation statements)

References 26 publications

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“…MPo] I00 50 ( Strain rate changes during the cyclic deformation test permit the determination of the components or~ and or* [8,9,[15][16][17] in a similar fashion as in unidirectional deformation [181. The increase of tr during hardening is found to be largely due to an increase of or~, i.e.…”

Section: Mechanical Measurementsmentioning

confidence: 99%

Cyclic deformation and fatigue behaviour of ?-iron mono-and polycrystals

1981

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strongly impeded dislocation multiplication below Aept -5 × 10 -4, appreciable secondary slip at higher Aepl leading to a cell structure (persistent slip bands do not form), shape changes due to asymmetric slip of screw dislocations and a relatively high effective stress level.The reduction of ~p~ and the presence of solute carbon atoms modify this behaviour significantly, making it more similar to that of f.c.c, metals. In all cases it was found that only the athermal component of the peak (saturation) stress but not the latter itself represents a suitable measure of the properties of the dislocation substructure.On the basis of the cyclic deformation behaviour and of observations of trans-and intergranular fatigue crack initiation it was concluded that the fatigue limit of a-iron is an intrinsic property of the b.c.c. structure whose characteristics, however, are affected sensitively by interstitial impurity content and by the strain rate of the fatigue test.

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Section: Mechanical Measurementsmentioning

confidence: 99%

Cyclic deformation and fatigue behaviour of ?-iron mono-and polycrystals

1981

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“…ƒÃpl is the true plastic strain rate and T is the temperature. This equation is attributed to A. Seeger, see [22], but we have found that it has been used by others before Seeger, see p. 29 of [3]. In any event, the formal similarity of Eqs.…”

Section: Creep Rate Upon a Stress Increase Observations And Explanatmentioning

confidence: 83%

The Overstress Dependence of Inelastic Rate of Deformation Inferred From Transient Tests

Krempl

1995

Journal of the Society of Materials Science, Japan

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Transient tests are used to demonstrate unusual or even paradoxical deformation behaviors in metallic alloys and polymers at ambient and elevated temperatures. Included are repeated relaxation tests and creep tests of short duration. It is shown that creep rate need not increase with a stress increase and that, at the same stress level, creep rate can be different on loading and unloading. Also, a stress magnitude increase can be found during relaxation. Once steady inelastic flow is reached, the relaxation rate is nearly independent of the stress and strain at which relaxation starts; it depends mainly on the preceding prior inelastic strain rate. These phenomena can be modeled using an overstress (effective stress) dependence of inelastic rate of deformation and a proper evolution law for a single state variable, the equilibrium stress (back stress) within the context of a "unified" state variable theory. The author and his students have developed the viscoplasticity theory based on overstress (VBO) that can model these unusual behaviors.

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“…Since both materials have high purity, especially Fe-Cr alloy is interstitial-free, we can discuss the microstructural difference in terms of nature of crystal slip intrinsic to FCC/BCC structures. Since Peierls potential of screw dislocations is higher than that of edge dislocation in BCC crystals, the plastic deformation is rate-controlled by screw dislocations [41], and glided area swept by screw dislocation is higher than that by edge dislocation [42]. Thus, the nature of slip intrinsic to screw dislocation such as cross slip, or pensile glide become pronounced and influential on the macroscopic behavior of plastic deformation.…”

Section: Discussionmentioning

confidence: 99%

“…The dislocations on various {110}, and possibly {211}, with the common slip direction form the dislocation boundaries. With increasing plastic strain, subboundaries increase their misorientation by absorbing lattice dislocations from the adjoining grains [4,42]. In BCC, high frictional stress of screw dislocations and resultant frequent cross slip promote dislocation multiplications and the formation of subgrain boundaries [41].…”

Section: Discussionmentioning

confidence: 99%

Microstructural Development of Fe-20mass%Cr Alloys and Pure Copper Processed by Equal-Channel Angular Pressing

Rifai¹,

Haga²,

Miyamoto³

et al. 2013

MSA

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Microstructural development of ultra low C, N, Fe-Cr alloy and pure copper processed by equal-channel angular pressing (ECAP) have been examined focusing on the initial stage of the formation of ultrafine grain structure. Fe-Cr alloys were pressed at 423 K while pure copper at room temperature for 1 to 3 passes via the route Bc to compare at the equivalent homologous temperature. Microstructural evolutions were characterized by electron backscatter diffraction (EBSD) image and transmission electron microscopy (TEM). It was found that deformation structures were mostly deformation-induced subboundaries in both the materials after one pass, but the fraction of high-angle grain boundary became higher in the Fe-Cr alloys than in pure copper in subsequent passes by increasing misorientation of the boundaries. The more enhanced formation of high angle boundaries in Fe-Cr alloys was discussed in terms of the nature of crystal slip of FCC and BCC structures.

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The effect of strain-rate on the cyclic deformation properties of α-iron single crystals

Cited by 127 publications

References 26 publications

Cyclic deformation and fatigue behaviour of ?-iron mono-and polycrystals

Cyclic deformation and fatigue behaviour of ?-iron mono-and polycrystals

The Overstress Dependence of Inelastic Rate of Deformation Inferred From Transient Tests

Microstructural Development of Fe-20mass%Cr Alloys and Pure Copper Processed by Equal-Channel Angular Pressing

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