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首页> 外文会议>International Conference on Processing amp; Manufacturing of Advanced Materials Pt.5; Jul 7-11, 2003; Leganes, Madrid, Spain >PLASTIC DEFORMATION AND STRESS-INDUCED PHASE TRANSFORMATION IN POLYCRYSTALLINE DIAMOND: COMMON PHENOMENA?
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PLASTIC DEFORMATION AND STRESS-INDUCED PHASE TRANSFORMATION IN POLYCRYSTALLINE DIAMOND: COMMON PHENOMENA?

机译：多晶金刚石中的塑性变形和应力诱导的相变：常见现象？

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摘要

Plasticity in diamond lattices has been studied extensively even if the phenomenon is considered difficult to achieve in actual diamond. Slip and cleavage occur on the {111}-planes and at low temperatures and pressures the latter prevails. Twinning and phase transformation are other mechanisms by which a material may yield to external stresses. Mechanical twinning (on {111}) has been reported for diamond lattices. The only phase transformation known to occur under normal circumstances is from the metastable diamond to the stable graphite. The author explores the possibility that also the cubic diamond to hexagonal lonsdaleite occurs, analogous to the martensitic FCC-HCP transformation in metals. A simple analysis shows that permanent deformations are only probable at elevated hydrostatic pressures in presence of a deviatoric stress. These conditions are attained during high-speed metal cutting with polycrystalline diamond (PCD) tools. SEM analysis of worn tools will demonstrate that certain accelerated wear processes in PCD can be attributed to the plastic deformation of the crystals at the tip. This implicates that the plasticity of diamond is a fairly common phenomenon with industrial relevance. Evidence for stress-induced phase transformation is presented also, but the exact nature of the phases that are formed remains in doubt.
机译：即使认为这种现象在实际的金刚石中很难实现，也已经广泛研究了金刚石晶格中的可塑性。滑移和劈裂发生在{111}平面上，并且在低温和低压下占主导地位。孪生和相变是材料可能屈服于外部应力的其他机制。对于金刚石晶格，已经报道了机械孪晶（在{111}上）。已知在正常情况下唯一发生的相变是从亚稳态金刚石到稳定的石墨。作者探讨了发生立方晶金刚石到六角形长方岩的可能性，类似于金属中的马氏体FCC-HCP转变。一个简单的分析表明，只有在存在偏应力的情况下，在升高的静水压力下，永久变形才可能发生。这些条件是在使用多晶金刚石（PCD）工具进行高速金属切削时达到的。磨损工具的SEM分析将证明PCD中某些加速的磨损过程可归因于尖端晶体的塑性变形。这暗示着金刚石的可塑性是与工业相关的相当普遍的现象。还提供了应力诱导的相变的证据，但是所形成的相的确切性质仍然令人怀疑。

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