Evidence for residual elastic strain in deformed natural quartz

Kunz, Martin; Chen, Kai; Tamura, Nobumichi; Wenk, Hans‐Rudolf

doi:10.2138/am.2009.3216

Cited by 28 publications

(21 citation statements)

References 15 publications

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“…A set of fixed righthanded sample coordinates, of which the z-axis was defined normal to the sample surface and the x-axis within the sample surface and perpendicular to X-ray beam direction, was established for crystal orientation representation. The experimental configuration and the LPs collected were similar to those described elsewhere for quartz (Kunz et al 2009b). …”

Section: Methodsmentioning

confidence: 99%

Deformation twinning and residual stress in calcite studied with synchrotron polychromatic X-ray microdiffraction

et al. 2011

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Microstructures of deformed calcite in marble from the Bergell Alps are studied by using a microfocused polychromatic synchrotron X-ray beam. The high spatial resolution, together with orientation and strain resolutions, reveals twin plane orientation, multiple twin lamellae, and strain distributions associated with the twins. Single and multiple mechanical twins on e ¼ 0118 È É systems are confirmed. Residual stresses are derived from the strain tensor that is derived from Laue diffraction patterns. Average lattice strains from several hundred to over one thousand microstrains are detected in a deformed marble from the Bergell Alps. Such strains suggest 60-120 MPa residual stresses. A detailed study of strain components shows that shear stresses on twin planes are completely released.

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Section: Methodsmentioning

confidence: 99%

Deformation twinning and residual stress in calcite studied with synchrotron polychromatic X-ray microdiffraction

et al. 2011

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“…These strains appear sufficient to remove twins when cycling through the phase transition to achieve the initial low energy configuration. Experiments by Burnley and Zhang (2008) indicate a considerable variation of elastic strains in deformed quartz rocks, depending on orientation, and significant residual strains (1,000-2,000 microstrains) have recently been observed in metamorphic quartz (Kunz et al 2009). Thus stress equilibrium remains a viable option.…”

Section: Interpretation and Significancementioning

confidence: 99%

Dauphiné twinning and texture memory in polycrystalline quartz. Part 3: texture memory during phase transformation

et al. 2009

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Samples of quartz-bearing rocks were heated above the a (trigonal)-b (hexagonal) phase transformation of quartz (625-950°C) to explore changes in preferred orientation patterns. Textures were measured both in situ and ex situ with neutron, synchrotron X-ray and electron backscatter diffraction. The trigonal-hexagonal phase transformation does not change the orientation of c-and a-axes, but positive and negative rhombs become equal in the hexagonal b-phase. In naturally deformed quartzites measured by neutron diffraction a perfect texture memory was observed, i.e. crystals returned to the same trigonal orientation they started from, with no evidence of twin boundaries. Samples measured by electron back-scattered diffraction on surfaces show considerable twinning and memory loss after the phase transformation. In experimentally deformed quartz rocks, where twinning was induced mechanically before heating, the orientation memory is lost. A mechanical model can explain the memory loss but so far it does not account for the persistence of the memory in quartzites. Stresses imposed by neighboring grains remain a likely cause of texture memory in this mineral with a very high elastic anisotropy. If stresses are imposed experimentally the internal stresses are released during the phase transformation and the material returns to its original state prior to deformation. Similarly, on surfaces there are no tractions and thus texture memory is partially lost.

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“…The intention of this study is to examine what mechanism might be the most dominant one in Fe-Cr-Al alloy, at the upper limit ("hot-leg") temperature of 800 0 C. In the study, we evaluate the micro-strain and distribution of plastic deformation near the steel-oxide interface in a Fe-Cr-Al alloy by using synchrotron X-ray Laue microdiffraction (μXRD). This proved to be an efficient method for correlation of mechanical properties with local structure at micron scale [52][53][54][55][56][57]. The diffraction scanning step size was 1 μm, and a Laue pattern was recorded at each step with 1 s exposure time using an area DECTRIS Pilatus 1M detector which was placed about 140 mm away from the X-ray focal point at 90 o with respect to the incoming beam.…”

Section: Introductionmentioning

confidence: 99%

A study of deformation and strain induced in bulk by the oxide layers formation on a Fe-Cr-Al alloy in high-temperature liquid Pb-Bi eutectic

et al. 2018

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At elevated temperatures, heavy liquid metals and their alloys are known to create a highly corrosive environment that causes irreversible degradation of most iron-based materials. It has been found that an appropriate concentration of oxygen in the liquid alloy can significantly reduce this issue by creating a passivating oxide scale that controls diffusion, especially if Al is present in Fe-based materials (by Al-oxide formation). However, the increase of the temperature and of oxygen content in liquid phase leads to the increase of oxygen diffusion into bulk, and to promotion of the internal Al oxidation. This can cause a strain in bulk near the oxide layer, due either to mismatch between the thermal expansion coefficients of the oxides and bulk material, or to misfit of the crystal lattices (bulk vs. oxides). This work investigates the strain induced into proximal bulk of a Fe-Cr-Al alloy by oxide layers formation in liquid lead-bismuth eutectic utilizing synchrotron X-ray Laue microdiffraction. It is found that internal oxidation is the most likely cause for the strain in the metal rather than thermal expansion mismatch as a two-layer problem.Dear Sir, I re-submit our paper entitled: "A study of deformation and strain induced in bulk by the oxide layers formation on a Fe-Cr-Al alloy in high-temperature liquid Pb-Bi eutectic" on behalf of all co-authors to Acta Materialia, after addressing all the revisions stated by the reviewer. In the study, we analyze a strain in the near-interface bulk of ferritic FeCrAl alloy after its exposure to heavy liquid metals. Two possible origins of strain were considered: internal oxidation of aluminum in bulk, and thermal expansion mismatch between the oxide and the bulk. A positive correlation of dislocation density with peak width distribution indicates that strain comes from plastic deformation, while the evidence of grain refinement and sub-grain formation indicates a noticeable internal oxidation. Based on the comparison with theoretical predictions, we conclude that internal oxidation is more dominant mechanism of strain induction.Sincerely, Miroslav P. Popovic, UC Berkeley Cover LetterWe thank the reviewer for his/her time and effort.Below we address all reviewer's comments (labeled "C") in detail, marked in green (labeled "A").C 0: -Dear authors, congratulations for this interesting work.A 0: We thank the reviewer for his/her assessment of our paper. C1-1: You are studying the deformation and strain induced in the bulk of a Fe-Cr-Al alloy (Alkrothal 720) by oxide scales that form in liquid LBE. Alkrothal is a bcc alloy, a fact that you should clearly mention when you describe the material in the Experimental section (not just mention that it is a ferritic alloy), giving some basic information on the lattice parameters. A1-2: We thank the reviewer for this suggestion. We made changes in the manuscript and modified our statement (in the first paragraph of section 2. Experimental), so it reads now as following: C1-2. What you neglect to mention, however, is th...

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Evidence for residual elastic strain in deformed natural quartz

Cited by 28 publications

References 15 publications

Deformation twinning and residual stress in calcite studied with synchrotron polychromatic X-ray microdiffraction

Deformation twinning and residual stress in calcite studied with synchrotron polychromatic X-ray microdiffraction

Dauphiné twinning and texture memory in polycrystalline quartz. Part 3: texture memory during phase transformation

A study of deformation and strain induced in bulk by the oxide layers formation on a Fe-Cr-Al alloy in high-temperature liquid Pb-Bi eutectic

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