Mise en evidence de la plasticite de la magnetite mesure de la durete en fonction de la temperature

Charpentier, Ph.; Rabbe, P.; Manenc, J.

doi:10.1016/0025-5408(68)90049-4

Cited by 31 publications

(12 citation statements)

References 6 publications

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“…From the observations of Veyssière et al, 49 Donlon, 79 and Doukhan 80 for Mg-Al spinel and Veyssière et al, 81 Ito, 82 and Charpentier et al 83 for other spinel-type compounds, the dislocations introduced by room-temperature indentation are supposed to be mainly the 1 ⁄2〈110〉{111} type. This observation is basically consistent with the slip system that was deduced from the microhardness anisotropy.…”

Section: (4) Hardness Anisotropymentioning

confidence: 98%

Effects of Neutron Irradiation on the Mechanical Properties of Magnesium Aluminate Spinel Single Crystals and Polycrystals

Yano

1999

Journal of the American Ceramic Society

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The effect of fast neutron irradiation on the mechanical properties of magnesium aluminate spinel single crystals and polycrystals, such as bending strength, fracture toughness, Young's modulus, and hardness, was summarized based on the reported data. Essentially, the changes in these properties are dependent on the nature and concentration of neutron-irradiation-induced defects. Furthermore, the efficiency of damage accumulation is known to be dependent on temperature. Spinel shows superior resistance to the formation of defect aggregates, and the recombination of point defects occurs efficiently under neutron irradiation; therefore, the change in mechanical properties is not critical, up to very high neutron fluences, and the spinel maintains its structural integrity.

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Section: (4) Hardness Anisotropymentioning

confidence: 98%

Effects of Neutron Irradiation on the Mechanical Properties of Magnesium Aluminate Spinel Single Crystals and Polycrystals

Yano

1999

Journal of the American Ceramic Society

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“…Figures and contain experimental deformation data for magnetite [ Hennig‐Michaeli and Siemes , ; Gómez‐García et al ., ; Siemes et al ., ; Till et al ., ] and for some other spinel‐structured ferrites [ Nishikawa , ; Rabier et al ., ]. Experimental hardness data for magnetite have also been measured as function of temperature [ Charpentier et al ., ], although it is not possible to directly compare the hardness results with other mechanical data for magnetite. Although no grain size was reported by Crouch and Robertson [], many of their experiments plot fairly closely on our map for a grain size of 5 μ m. Deformation temperatures for other ferrites have been normalized by their melting temperatures, T m , so that they can be compared with magnetite as a function of homologous temperature ( T / T m ).…”

Section: Construction Of New Mapsmentioning

confidence: 99%

Magnetite deformation mechanism maps for better prediction of strain partitioning

Till

Moskowitz

2013

Geophysical Research Letters

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[1] A meta-analysis of existing experimental deformation data for magnetite and other spinel-structured ferrites reveals that previously published flow laws are inadequate to describe the general deformation behavior of magnetite. Using updated rate equations for oxygen diffusion in magnetite, we present new flow laws that closely predict creep rates similar to those found in deformation experiments and that can be used to predict strain partitioning between cubic Fe oxides and other phases in the Earth's crust. New deformation mechanism maps for magnetite have been constructed as functions of temperature and grain size. Using the revised creep parameters, estimates of strain partitioning between magnetite, ilmenite, and plagioclase indicate that concentrated zones of Fe-Ti oxides in oceanic crust near slow-spreading ridges could accommodate significant amounts of strain at moderate temperatures and may contribute to aseismic creep along spreading-segment faults. Citation: Till, J. L., and B. Moskowitz (2013), Magnetite deformation mechanism maps for better prediction of strain partitioning, Geophys. Res. Lett., 40,[697][698][699][700][701][702]

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“…The 5 O / o fracture strains measured in magnetite under compression exceed the theoretical limit of -3 O/o and must involve some plastic deformation; Charpentier et al (17) have presented evidence for plastic (dislocation) deformation of mggnetite at room temperature. Thick and porous oxides are expected to contain large inherent defects and to fail at the same strains as bulk polycrystalline oxides; this is observed when magnetite films are strained in tension.…”

Section: Fracture Strains In Oxidesmentioning

confidence: 95%

“…An analysis of this process for oxides (15) shows that the creep rate is not always exactly that given by the Herring (16) equation; the correctior? Deformation by a dislocation process has been reported for single crystals of magnetite (17) and other oxides (13). Deformation by a dislocation process has been reported for single crystals of magnetite (17) and other oxides (13).…”

Section: Plasticity In Oxidesmentioning

confidence: 99%

Strain/Oxidation Interactions in Steels and Model Alloys

Holmes

Pascoe

1972

Materials & Corrosion

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Fig. 14. Distortion in cupnous oxide at the CuO-Cu,O interface after oxidation at 940 OC for 2 hrs. Replica X 4100 {Etched lightly in FeCl, + HCl solution and Au-Pd shadowed) Courtesy of Pergamon Press has been used to estimate the effect of various elements at a concentration of about 0.4 wt 010 on the adherence of scales on iron (13, 14). The results fall into four groups; those that form mixed oxide scales with wiistite either spalled or were weakly adherent; those on the more noble metal alloys were nearly comparable with pure iron, but copper and tin had a detrimental effect. Scales containing As, Sb and P were weakly adherent but left a thin adherent scale layer on the metal surface. Cobalt and niobium had no effect. Surface enrichment in the subscale layer was very noticeable in certain cases, particularly with As. This effect has been reported by Vodopivec and his colle-agues (15, 16) and could be very significant considering the ubiquitous nature of this element. I t is probably responsible for the thin ,,white" layers with low carbon content seen in early hammer-welded iron artifacts.

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Mise en evidence de la plasticite de la magnetite mesure de la durete en fonction de la temperature

Cited by 31 publications

References 6 publications

Effects of Neutron Irradiation on the Mechanical Properties of Magnesium Aluminate Spinel Single Crystals and Polycrystals

Effects of Neutron Irradiation on the Mechanical Properties of Magnesium Aluminate Spinel Single Crystals and Polycrystals

Magnetite deformation mechanism maps for better prediction of strain partitioning

Strain/Oxidation Interactions in Steels and Model Alloys

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