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Related Experiment Videos

Strength of diamond.

D J Weidner, Y Wang, M T Vaughan

    Science (New York, N.Y.)
    |October 21, 1994
    PubMed
    Summary
    This summary is machine-generated.

    Diamond exhibits elastic behavior at room temperature but deforms ductilely above 1000°C under high pressure. Its yield strength significantly decreases with increasing temperature, indicating crystal plasticity as the primary deformation mechanism.

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    Area of Science:

    • Materials Science
    • Geophysics
    • Solid State Physics

    Background:

    • Diamond, known for its hardness, is studied under extreme conditions.
    • Understanding its mechanical properties at high pressures and temperatures is crucial for various scientific fields.

    Purpose of the Study:

    • To measure the yield strength of diamond under high pressure (10 GPa) and elevated temperatures (up to 1550°C).
    • To investigate the deformation mechanisms of diamond under these conditions.

    Main Methods:

    • X-ray diffraction analysis of powdered diamond samples to examine peak shapes.
    • Varying pressure and temperature conditions to observe changes in diffraction patterns.
    • Transmission electron microscopy (TEM) for post-deformation analysis of recovered samples.

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    Main Results:

    • Diamond crystals show elastic behavior at room temperature and 10 GPa.
    • Ductile deformation becomes significant only above 1000°C at 10 GPa.
    • Differential yield strength decreases from 16 GPa at 1100°C to 4 GPa at 1550°C.
    • TEM confirms crystal plasticity as the dominant deformation mechanism.

    Conclusions:

    • Diamond's mechanical behavior transitions from elastic to ductile under high pressure and temperature.
    • Temperature plays a critical role in reducing diamond's yield strength at extreme pressures.
    • Crystal plasticity governs the deformation of diamond under combined high pressure and temperature conditions.