Nanoindentation of natural diamond
Nanoindentation of natural diamond
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DOI：
10.1080/01418610208235696
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发表时间：
2002-07
期刊：
影响因子：
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通讯作者：
Takeshi Sawa;Kohichi Tanaka
中科院分区：
文献类型：
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作者：
Takeshi Sawa;Kohichi Tanaka
摘要 该研究表明，重量小于0.2克拉的天然钻石的平面应变杨氏模量E* = E/(1 - v 2)可以通过纳米压痕技术测定，其中E为杨氏模量，v为泊松比。使用 Berkovich 压头对三个样品在 50、100 和 300 mN 的载荷下进行压痕试验；两种是 ⟨100⟩ 导向，一种是 ⟨110⟩ 导向。压痕曲线在 50 mN 下几乎显示出弹性行为。我们通过分析弹性压痕曲线来评估 E* 值，其中消除了由于机架和安装座变形而导致的机器柔顺性的贡献，这是根据在 100 和 300 mN 的载荷下压痕卸载期间获得的数据确定的。对于 ⟨100⟩ 和 ⟨110⟩ 取向钻石，获得的 E* 值分别为 1090 和 1217 GPa。这些值与通过超声波技术测量的文献值分别为 1064 和 1169 GPa 相当吻合。建议使用 ⟨100⟩ 取向金刚石的值 E* = 1090 GPa 作为金刚石压头的值，因为压头通常由天然金刚石制成，其轴沿 ⟨100⟩ 方向。
Abstract This study demonstrates that the plane-strain Young's moduli E* = E/(1 - v 2) of natural diamonds with a weight of less than 0.2 carat can be determined by the technique of nanoindentation, where E is Young's modulus and v is Poisson's ratio. The indentation test with a Berkovich indenter was conducted at loads of 50, 100 and 300 mN for three samples; two were ⟨100⟩ oriented and one was ⟨110⟩ oriented. The indentation curves showed almost an elastic behaviour at 50 mN. We evaluated the E* values by analysing the elastic indentation curves with the removal of the contribution of machine compliances due to the machine frame and the deformation of the mount, which was determined from the data obtained during the unloading of the indentation at loads of 100 and 300 mN. The E* values obtained were 1090 and 1217 GPa for ⟨100⟩- and ⟨110⟩-oriented diamonds respectively. These agree reasonably well with the literature values, 1064 and 1169 GPa respectively, measured by an ultrasonic technique. The value for ⟨100⟩-oriented diamond, E* = 1090 GPa, is recommended to use as the value for the diamond indenter, since the indenter is ordinarily manufactured from a natural diamond with its axis along the ⟨100⟩ direction.