Plastic flow of Fe-binary alloys—I. A description at low temperatures

Chen, Y.T.; Atteridge, D.G.; Gerberich, William W.

doi:10.1016/0001-6160(81)90068-7

Cited by 48 publications

(21 citation statements)

References 26 publications

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“…The cross-over temperature decreases with increasing Si concentration. This behavior of the CRSS agrees with the experimentally reported behavior [51][52][53] presented in the lower figure of Fig. 12(a).…”

Section: Dislocationsupporting

confidence: 91%

Mechanical properties of Fe-rich Si alloy from Hamiltonian

et al. 2017

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The physical origins of the mechanical properties of Fe-rich Si alloys are investigated by combining electronic structure calculations with statistical mechanics means such as the cluster variation method, molecular dynamics simulation, etc, applied to homogeneous and heterogeneous systems. Firstly, we examined the elastic properties based on electronic structure calculations in a homogeneous system and attributed the physical origin of the loss of ductility with increasing Si content to the combined effects of magneto-volume and D0 3 ordering. As a typical example of a heterogeneity forming a microstructure, we focus on grain boundaries, and segregation behavior of Si atoms is studied through high-precision electronic structure calculations. Two kinds of segregation sites are identified: looser and tighter sites. Depending on the site, different segregation mechanisms are revealed. Finally, the dislocation behavior in the Fe-Si alloy is investigated mainly by molecular dynamics simulations combined with electronic structure calculations. The solid-solution hardening and softening are interpreted in terms of two kinds of energy barriers for kink nucleation and migration on a screw dislocation line. Furthermore, the clue to the peculiar work hardening behavior is discussed based on kinetic Monte Carlo simulations by focusing on the preferential selection of slip planes triggered by kink nucleation.npj Computational Materials (2017) 3:10 ; doi:10.1038/s41524-017-0012-4 INTRODUCTION Mechanical properties of alloys originate from the behavior of electrons and atoms on the microscopic scale; however, the strength of atomic bonding does not directly relate to macroscopic mechanical properties such as the yield strength, fracture toughness, and fatigue resistance. This is because the microstructure on the mesoscale, which is composed of various defects such as impurities, grain boundaries, and dislocations, mediates or enhances the response of alloys against external forces, leading to fairly nonlinear and multiscale phenomena. Facing such a nonlinear nature associated with the strength and plastic deformation of alloys, identifying the controlling factors for the mechanical properties is a significantly difficult task, and clarifying the underlying physics at different length and time scales still remains a major challenge in materials science.The authors of the present article took up the challenge of this complicated problem with their particular theoretical and computational tools unique to each characteristic scale range. These tools are electronic structure calculations, the cluster variation method (CVM) of statistical mechanics, and molecular dynamics (MD) simulations, which may cover the atomic to mesoscopic scale ranges. By virtue of high-performance computers, some of the results obtained by the present calculations achieve a higher precision and reveal a clearer picture than those obtained by ordinary experiments.Among the various mechanical properties, the main focus of the present study is the solid-solut...

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Section: Dislocationsupporting

confidence: 91%

Mechanical properties of Fe-rich Si alloy from Hamiltonian

et al. 2017

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“…This fact suggests that the high strength of quenched gum metal is due to solid solution hardening by dissolved interstitial oxygen atoms. The temperature dependence of solution hardened bcc metal alloys commonly consists of a rapid temperature dependent part at low temperature due to the Peierls mechanism and a gentle temperature dependent (often athermal) part at high temperature due to alloy hardening, both by substitutional 15,16) and interstitial elements.…”

Section: )mentioning

confidence: 99%

Thermally Activated Deformation of Gum Metal: A Strong Evidence for the Peierls Mechanism of Deformation

et al. 2015

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Compression deformation and stress relaxation tests have been made over a wide temperature range for Ti-based bcc alloy single crystal of Gum Metal composition to elucidate the deformation mechanism. The shear yield stress decreases rapidly with increasing temperature with decreasing slope above room temperature, tending to level off. Activation analysis showed that the activation volume becomes smaller than 10 b 3 (b: the Burgers vector) at high stress, indicating that the deformation is controlled by the Peierls mechanism at low temperature. Similar results have been obtained also for severely cold-swaged polycrystalline Gum Metal with the similar composition. These results contradict the generally accepted dislocation-free mechanism of Gum Metal.

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“…[10][11][12] The temperature dependence in bcc metals at low tempera- ture is often explained with Peierls mechanism. [10][11][12][13][14][15] The Peierls stress becomes higher with lowering temperature, and that results in the increase in the yield stress at low temperature. It should be noted here that the yield stress is higher in the 1 % Cu steel than in the pure iron at room temperature due to solid solution strengthening, however, there is a significant difference between these steels in temperature dependence; The yield stress of the 1 % Cu steel becomes smaller than that of the pure iron in the temperature range below 223 K by "solid solution softening".…”

Section: Temperature Dependence and Strain Ratementioning

confidence: 99%

“…[12][13][14][16][17][18][19][20][21] The most widely accepted theory is a decrease in the Peierls stress by solute atom. Chen 13) and Okazaki 14) suggested that the Peierls stress is decreased owing to the decrease in double kink nucleation energy by solute atom and this leads to the solid solution softening. Although the detailed mechanism of solid solution softening in Fe-Cu alloys has not been proved in this study, it is confirmed that the softening behavior of the alloys is quite similar to that of the other alloys.…”

Section: Temperature Dependence and Strain Ratementioning

confidence: 99%

Mechanism of Toughening in Ferritic Iron by Solute Copper at Low Temperature

2003

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The ductile-to-brittle transition (DBT) and plastic deformation behaviors were investigated in Fe-(0ϳ2)mass%Cu alloys to understand the effect of solute Cu on the mechanical properties of ferritic iron. The DBT temperature of ferritic iron in Charpy impact test was lowered by the solute Cu although the hardness at room temperature was increased owing to solid solution hardening. Tensile tests revealed that the yield stress of the Fe-1mass%Cu alloy becomes smaller than that of the Fe-0mass%Cu alloy in the temperature range below 223 K through solid solution softening by Cu. The solid solution softening makes slip deformation easy to occur even at such a lower temperature and also at high strain rate. This leads to suppressing twin deformation which induces brittle fracture of ferritic iron at low temperature, and resulting in the shift of DBT temperature to lower side.

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Plastic flow of Fe-binary alloys—I. A description at low temperatures

Cited by 48 publications

References 26 publications

Mechanical properties of Fe-rich Si alloy from Hamiltonian

Mechanical properties of Fe-rich Si alloy from Hamiltonian

Thermally Activated Deformation of Gum Metal: A Strong Evidence for the Peierls Mechanism of Deformation

Mechanism of Toughening in Ferritic Iron by Solute Copper at Low Temperature

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