The effect of small concentrations of carbon impurity on dislocation mobility in iron monocrystals

Turner, A.P.L.; Vreeland, T.

doi:10.1016/0036-9748(70)90232-2

Cited by 10 publications

(5 citation statements)

References 2 publications

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“…Further selective etch experiments in the next decades replicated these results in a vast number of materials, under different temperature ranges and under irradiation conditions [50]. Materials tested in this way include the metals W [51], Fe [44,52], Fe-C [53], Fe-Si [16,54,55], Al [56], Cu [57,58,59,60], irradiated Cu [61], Al-Cu alloys [17,21,57,62], Ni [63], Pb [64], Mg [65], Zn [66,67,68,59,69,70,71,72], Nb [73,74,75], α-Ti [76], In [77], K [52], Mo [65,78,79], Ag [80], and a number of ceramics and semiconductors, including pure Ge [81] and Si [82,83], LiF [48,84,85,86], BeO [87], KCl [88], Na...…”

Section: Experimental Evidencementioning

confidence: 94%

“…Further selective etch experiments in the next decades replicated these results in a vast number of materials, under different temperature ranges and under irradiation conditions [50]. Materials tested in this way include the metals W [51], Fe [44,52], Fe-C [53], Fe-Si [16,54,55], Al [56], Cu [57–60], irradiated Cu [61], Al–Cu alloys [17,21,57,62], Ni [63], Pb [64], Mg [65], Zn [59,66–72], Nb [73–75], α -Ti [76], In [77], K [52], Mo [65,78,79], Ag [80], and a number of ceramics and semiconductors, including pure Ge [81] and Si [82,83], LiF [48,84–86], BeO [87], KCl [88], NaCl [89], KBr [90,91], InSb [82,92], GaAs [93], GaSb [82], InP [94], GeSi [95,96]. In Si, particular focus was placed on studying the mobility of dislocations under various temperatures and doping conditions, often with seemingly contradictory results [82,…”

Section: Experimental Evidencementioning

confidence: 99%

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The mechanics and physics of high-speed dislocations: a critical review

Gurrutxaga-Lerma

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Dini

2020

International Materials Reviews

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High speed dislocations have long been identified as the dominant feature governing the plastic response of crystalline materials subjected to high strain rates. They allegedly control deformation and failure response of industrial processes in a large range of applications, including machining, laser shock peening, punching, drilling, crashworthiness, foreign object damage,etc. Despite decades of study, achieving a consensus on the role and influence high speed dislocations have on the materials response observed at the macro-scale by the means of rigorous mechanistic grounding remains elusive. This article reviews both experimental and theoretical efforts made to address this issue in a systematic way. The lack of experimental evidence and direct observation of high speed dislocations means that most work on the matter is rooted on theory and simulations. This article offers a critical review of the competing theoretical accounts of high speed mechanisms, their underlying hypothesis, insights, and shortcomings. It explores the role that the speed of sound plays in the modelling of high speed dislocations, the way dislocations are modelled in the elastic continuum and how this approach can be used to study plasticity at high strain rates. The role atomistic models of dislocations have played in clarifying high speed motion mechanisms, and how they have led to the development of dislocation velocity-stress relations describing dislocation mobility is then also discussed. The article also reviews modelling efforts aimed at describing high speed dislocation mobility, and how different proposed physical mechanisms believed influence the motion. The article closes with an overview of the current state of the art and suggestions for key developments needed to improve our fundamental understanding in future research.

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Section: Experimental Evidencementioning

confidence: 94%

“…Further selective etch experiments in the next decades replicated these results in a vast number of materials, under different temperature ranges and under irradiation conditions [50]. Materials tested in this way include the metals W [51], Fe [44,52], Fe-C [53], Fe-Si [16,54,55], Al [56], Cu [57–60], irradiated Cu [61], Al–Cu alloys [17,21,57,62], Ni [63], Pb [64], Mg [65], Zn [59,66–72], Nb [73–75], α -Ti [76], In [77], K [52], Mo [65,78,79], Ag [80], and a number of ceramics and semiconductors, including pure Ge [81] and Si [82,83], LiF [48,84–86], BeO [87], KCl [88], NaCl [89], KBr [90,91], InSb [82,92], GaAs [93], GaSb [82], InP [94], GeSi [95,96]. In Si, particular focus was placed on studying the mobility of dislocations under various temperatures and doping conditions, often with seemingly contradictory results [82,…”

Section: Experimental Evidencementioning

confidence: 99%

The mechanics and physics of high-speed dislocations: a critical review

Gurrutxaga-Lerma

Verschueren

Dini

2020

International Materials Reviews

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“…The Fe and Fe-Cr alloys have different C concentrations (0.0119, 0.0018 and 0.0021 mass% for Fe, Fe-3%Cr and Fe-9%Cr, respectively). Although impurity carbon atoms can pin both edge and screw dislocations, they are not likely to have a significant effect on dislocation motion once the dislocations are unpinned [25,26]. Since the dislocation sources, close to the crack tip, will be subjected to very high stresses, while the initial operation of the sources and the emission of their first dislocation might be slightly inhibited, the continued operation of the source will not.…”

Section: Methodsmentioning

confidence: 99%

“…Dislocation mobility data for the materials tested here are sparse. Data exist only for Fe, and then only for edge dislocations [25]; the DBT is most likely to be controlled by the motion of screw dislocations, which have much lower mobilities than edge dislocations in BCC metals [28].…”

Section: Activation Energies For Dislocation Glidementioning

confidence: 99%

Ductile–brittle transition of polycrystalline iron and iron–chromium alloys

Tanaka

Wilkinson

Roberts

2008

Journal of Nuclear Materials

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a b s t r a c tFracture toughness of polycrystalline Fe, Fe-3%Cr and Fe-9%Cr was measured by four-point bending of pre-cracked specimens at temperatures between 77 K and 150 K and strain rates between 4.46 Â 10 À4 and 2.23 Â 10 À2 s À1 . For all materials, fracture behaviour changed with increasing temperature from brittle to ductile at a distinct brittle-ductile transition temperature (T c ), which increased with increasing strain rate. At low strain rates, an Arrhenius relation was found between T c and strain rate in each material. At high strain rates, T c was at slightly higher values than those expected from extrapolation of the Arrhenius relation from lower strain rates. This shift of T c was associated with twinning near the crack tip. For each material, use of an Arrhenius relation for tests at strain rates at which specimens showed twinning gave the same activation energy as for the low strain rate tests. The values of activation energy for the brittle-ductile transition of polycrystalline Fe, Fe-3%Cr and Fe-9%Cr were found to be 0.21, 0.15 and 0.10 eV, respectively, indicating that the activation energy for dislocation glide decreases with increasing chromium concentration in iron.

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“…[16][17][18] Although a considerable amount of research has been conducted on dislocation mobility and stress-strain response of hydrogenated carbon steels, [26][27][28] there are no detailed experimental reports dividing the three factors.…”

Section: Suppression Mechanism Of Strain-age-hardening In Carbon Steementioning

confidence: 99%