Plastic deformation of diamond at room temperature

Humble, P.; Hannink, R. H. J.

doi:10.1038/273037a0

Cited by 64 publications

(25 citation statements)

References 7 publications

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“…These facts suggest that the channels involve more than two mechanical twinnings (lets us recall that in diamond, there are 4 {111} twin plane directions, 6 <110> and 12 <211> directions). The {100} inner walls agree with the Humble and Hinnink indentation experiments [32]. Nevertheless the concave walls indicate that portions of other faces may be present.…”

Section: Discussionsupporting

confidence: 78%

“…-At 1200°C, the plastic deformation and ductile flow is meditated by the <110>{111} dislocation glide and a very active {111} microtwinning. These results do not support {100} cleavages that were revealed by Humble and Hinnink by indentation experiments [32]. In another interesting paper, DeVries [33] reported the graph with P and T conditions under which microtwinning could occur.…”

Section: Discussioncontrasting

confidence: 42%

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Plastic deformation in natural diamonds: Rose channels associated to mechanical twinning

Schoor

Boulliard

Gaillou

et al. 2016

Diamond and Related Materials

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Hollow channels in diamond are well acknowledged to be the result of dissolution processes.In this article we demonstrate that some hollow channels in natural diamonds are the consequence of intense plastic deformation by mechanical twinning. Two mixed-habit diamonds presenting numerous geometrical hollow tubes were studied. X-ray Laue analyses showed the presence of microtwins. At the intersection of microtwins, displacements and cracks are generated, creating the hollow channels observed. The presence of the cracks seems to have released the internal stress, as there was less to no signs of deformation at and around them. Further dissolutions are sometimes but not always seen within the cavities. Mechanical twinning, so far mostly identified in pink to purple diamonds, might be more widespread than originally thought in natural diamonds. Graphical AbstractMacroscopic voids (≥ 100 µm in diameter, and sometimes ≥ 1 mm long) are observed in some mixed-habit growth natural diamonds. The voids are created at the intersection of two twins and are interpreted as Rose channels. This figure shows cross sections of the Rose channels by scanning electron microscope imaging and their interpretation.

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Section: Discussionsupporting

confidence: 78%

Section: Discussioncontrasting

confidence: 42%

Plastic deformation in natural diamonds: Rose channels associated to mechanical twinning

Schoor

Boulliard

Gaillou

et al. 2016

Diamond and Related Materials

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“…According to first principles calculations of Telling et al2, the energy ratio required to cleave the {100}, {110}, and {111} planes in diamond crystals is approximately 7:2.8:1, indicating that the {111} plane can more readily be fractured than the other planes2. While this has commonly been observed in the processes of diamond cutting and shaping1, microstructure studies of indented diamonds revealed both {111}116 and {001}17 cleavage planes. To date, the exact fracture mechanism has yet been elucidated by controlled deformation experiments.…”

Section: Resultsmentioning

confidence: 99%

Constitutive Law and Flow Mechanism in Diamond Deformation

Raterron

Zhang

et al. 2012

Sci Rep

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Constitutive laws and crystal plasticity in diamond deformation have been the subjects of substantial interest since synthetic diamond was made in 1950's. To date, however, little is known quantitatively regarding its brittle-ductile properties and yield strength at high temperatures. Here we report, for the first time, the strain-stress constitutive relations and experimental demonstration of deformation mechanisms under confined high pressure. The deformation at room temperature is essentially brittle, cataclastic, and mostly accommodated by fracturing on {111} plane with no plastic yielding at uniaxial strains up to 15%. At elevated temperatures of 1000°C and 1200°C diamond crystals exhibit significant ductile flow with corresponding yield strength of 7.9 and 6.3 GPa, indicating that diamond starts to weaken when temperature is over 1000°C. At high temperature the plastic deformation and ductile flow is meditated by the <110>{111} dislocation glide and a very active {111} micro-twinning.

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“…Within the interiors of the grains no defects could be detected suggesting that most of the defects are absorbed by the grain boundaries due to their proximity. However, this type of plastic deformation at high strains rates does not seem to be limited to metals and alloys [48], but has been observed on ceramic [49] and diamond [50] surfaces as well. Except for limited microhardness data, very little is known about the mechanism of grain size reduction and the related changes in the structural, mechanical and thermodynamic properties of wear surfaces.…”

Section: Related Topicsmentioning

confidence: 97%

Nanophase Materials by Mechanical Attrition: Synthesis and Characterization

Fecht

1994

Nanophase Materials

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ABSTRACT. Mechanical attrition characterized by a cyclic shear deformation of powder particles has been found to be a versatile method in producing nanophase materials with a broad range of chemical composition and atomic structure including nanocrystalline as well as amorphous states. In this process, lattice defects are produced by "pumping" energy into initially single-crystalline powder particles of typically 50 j.l1l1 particle diameter. This internal refining process with a reduction of the average grain size by a factor of 10 3 -10 4 results from the creation and self-organization of high-angle grain boundaries within the powder particles during the milling process. By TEM analysis the mechanism of grain size reduction has been revealed to occur in three distinctively different steps involving the formation of grain boundaries. Together with the microstructural evolution of attrited nanophase materials, a change of the thermodynamic, mechanical and chemical properties of these materials has been observed with the properties of nanophase materials becoming controlled by the free volume and cohesive energy of the grain boundaries. As such, it is expected that the study of mechanical attrition processes in the future not only opens new processing routes for a variety of advanced nanophase materials but also improves the understanding of technologically relevant deformation processes, e.g. surface wear, on a nanoscopic level.

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Plastic deformation of diamond at room temperature

Cited by 64 publications

References 7 publications

Plastic deformation in natural diamonds: Rose channels associated to mechanical twinning

Plastic deformation in natural diamonds: Rose channels associated to mechanical twinning

Constitutive Law and Flow Mechanism in Diamond Deformation

Nanophase Materials by Mechanical Attrition: Synthesis and Characterization

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