Slip patterns made by sphere indentations on single crystal MnZn ferrite

Groenou, A. Broese van; Kadijk, S.E.

doi:10.1016/0001-6160(89)90294-0

Cited by 21 publications

(8 citation statements)

References 18 publications

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“…13d-f) reflect the slip system organisation through the slip traces at the sample surface. As expected (Van Groenou and Kadijk, 1989;Holmes et al, 1993;Farber et al, 1994;Nibur and Bahr, 2003), indenting along the [001] direction (Fig. 13d) make slip traces emerge on surface along the 〈101〉 directions with a four-fold symmetry.…”

Section: -1-2 Annealed Polycrystalline Nickel Samplesupporting

confidence: 75%

Sensitivity of the residual topography to single crystal plasticity parameters in Berkovich nanoindentation on FCC nickel

Renner

Gaillard

Richard

et al. 2016

International Journal of Plasticity

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Fundamental deformation mechanisms of FCC materials under indentation have been probed at the grain scale. Experimental tests have been conducted on large-grained annealed and cold-worked polycrystalline nickel samples with a Berkovich indenter. Indentation axes have been chosen to be close to the three main crystallographic directions [001], [101] and [111]. Pileups and slip traces have been revealed around the residual imprints by analysing topographic measurements obtained by atomic force microscopy. It is shown that the indenter orientation in each indentation plane drives pileups and slip traces which in turn contain precious information about the crystallographic orientation and the hardening state of the studied grain. Imprint topographies after pileup formation therefore carry information that one can exploit to assess some intrinsic material properties at the grain scale. A 3D finite element modelling of the nanoindentation test at the grain scale has been developed, making use of crystal plasticity constitutive laws. Six different virtual materials having the same macroscopic behaviour have been built. The simulation results show a good agreement with experimental tests and also a great pileup sensitivity to interaction matrix components. These results pave the way to the interaction matrix identification using an inverse finite element method. 1-Introduction Whether based on continuum mechanics or dislocation dynamics, crystal plasticity models involve generally a great number of material parameters, making the description of the phenomena very complete (

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Section: -1-2 Annealed Polycrystalline Nickel Samplesupporting

confidence: 75%

Sensitivity of the residual topography to single crystal plasticity parameters in Berkovich nanoindentation on FCC nickel

Renner

Gaillard

Richard

et al. 2016

International Journal of Plasticity

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“…Some initial attempts focusing on this topic can be found in the work of Vangroenou and Kadijk. [2] More recently, Wang et al [3] presented a study of the dependence of nanoindentation pile-up patterns and microtextures on the crystallographic orientation using high purity copper single crystals. Their results showed that the pile-up patterns on the surfaces of (001)-, (011)-, and (111)-oriented single crystals have four-, two-, and six-fold symmetry, respectively.…”

Section: Nanoindentation Is a Technique Which Hasmentioning

confidence: 99%

Depth Dependence of Nanoindentation Pile-Up Patterns in Copper Single Crystals

Kucharski

Jarząbek

2014

Metall Mater Trans A

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A study of the dependence of nanoindentation pile-up patterns on the indentation load and crystallographic orientation is presented. Three different orientations-(001), (011), and (111)-of single crystal copper were investigated. Experiments were conducted on a CSM ultrananoindentation tester using a Berkovich tip. The topographic images were obtained using an atomic force microscope. The evolution of pile-up patterns with different applied loads was observed. The results show that for applied loads equal to 0.45 mN and smaller the pile-up patterns do not depend on the crystallographic orientation of the indented surface; instead, they depend on the tip's geometry. On the other hand, in the case of indentation loads bigger than 2 mN, pile-up patterns on the surfaces of (001)-, (011)-, and (111)-oriented single crystals have fourfold, twofold, and sixfold (or threefold) symmetry, respectively. An intermediate state was also reported. Furthermore, a detailed analysis of residual impressions with maximal applied loads equal to 2 mN and bigger reveals that both pile-up and sink-in patterns are present.

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“…Therefore magnetite deforming by slip on {111} does not require activation of any additional slip planes for homogeneous ductile deformation. While a number of experimental studies on spinel-structured minerals do find evidence for dominant slip on {111} (Charpentier et al 1968;Veyssiere et al 1978;Siemes et al 1991), several other studies have also found evidence for significant amounts of slip accommodated on {110} and {100} planes (Mishra and Thomas 1976;Duclos et al 1978;Broese Van Groenou and Kadijk 1989). Stoichiometric magnetite contains both Fe 2+ and Fe 3+ , and is stable at oxygen fugacities between the magnetite-hematite buffer and the magnetite-wustite buffer.…”

Section: Introductionmentioning

confidence: 99%

High-temperature creep of magnetite and ilmenite single crystals

Till

Rybacki

2020

Phys Chem Minerals

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We performed deformation experiments on dry natural single crystals of magnetite and ilmenite to determine the rheological behavior of these oxide minerals as a function of temperature, orientation, and oxygen fugacity. Samples were deformed at temperatures of 825–1150 $$\,^{\circ }$$ ∘ C to axial strains of up to 15–24% under approximately constant stress conditions up to 120 MPa in a dead-load-type creep rig at ambient pressure in a controlled gas atmosphere. Oxygen fugacity ranged from 10$$^{-9.4}$$ - 9.4 to 10$$^{-4}$$ - 4 atm. Ilmenite creep was insensitive to oxygen fugacity, while magnetite displayed a strong, non-monotonic oxygen fugacity dependence, with creep rates varying as $$f_{O_{2}}^{-0.7}$$ f O 2 - 0.7 and $$f_{O_{2}}^{0.4}$$ f O 2 0.4 at more reducing and more oxidizing conditions, respectively. Dislocation creep rates of magnetite single crystals were weakly dependent on crystallographic orientation with stress exponents that varied between 2.8 and 4.3 (mean 3.5 ± 0.4). Magnetite compressed parallel to <100>, <110>, and <111> axes exhibited apparent activation energies of 315±5, 345±30, and 290±5 kJ/mol, respectively. We estimated $${f_O}_2$$ f O 2 -independent magnetite activation energies of 715 ± 150, 725 ± 145, and 690 ± 150 kJ/mol for <100>, <110>, and <111> orientations, respectively, in the region of negative $${f_O}_2$$ f O 2 -dependence. Ilmenite single crystals were compressed parallel, normal, and inclined to the c-axis. Stress exponents of 3.4, 4.3, and 3.9 indicate dislocation creep with activation energies of 420 ± 35, 345 ± 30, and 360 ± 40 kJ/mol, respectively, for these orientations. Mechanical anisotropy in ilmenite is notably higher than in magnetite, as expected from its lower crystal symmetry. Constitutive equations were formulated for ilmenite and magnetite creep.

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Slip patterns made by sphere indentations on single crystal MnZn ferrite

Cited by 21 publications

References 18 publications

Sensitivity of the residual topography to single crystal plasticity parameters in Berkovich nanoindentation on FCC nickel

Sensitivity of the residual topography to single crystal plasticity parameters in Berkovich nanoindentation on FCC nickel

Depth Dependence of Nanoindentation Pile-Up Patterns in Copper Single Crystals

High-temperature creep of magnetite and ilmenite single crystals

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