Approaching the Limits of Strength: Measuring the Uniaxial Compressive Strength of Diamond at Small Scales

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• 作者：Jeffrey M. Wheeler ; Rejin Raghavan ; Juri Wehrs ; Yucheng Zhang ; Rolf Erni ; Johann Michler
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：January 13, 2016
• 年：2016
• 卷：16
• 期：1
• 页码：812-816
• 全文大小：381K
• ISSN：1530-6992

文摘

Diamond ?100?- and ?111?-oriented nanopillars were fabricated by focused ion beam (FIB) milling from synthetic single crystals and compressed using a larger diameter diamond punch. Uniaxial compressive failure was observed via fracture with a plateau in maximum stress of ～0.25 TPa, the highest uniaxial strength yet measured. This corresponded to maximum shear stresses that converged toward 75 GPa or ～ G/7 at small sizes, which are very close to the ultimate theoretical yield stress estimate of G/2π.