Variation in the nanoindentation hardness of platinum
Variation in the nanoindentation hardness of platinum
复制标题
铂纳米压痕硬度的变化
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
D. Bahr
中科院分区：
文献类型：
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作者：
M. Maughan;H. Zbib;D. Bahr
使用配备伯科维奇尖端的纳米压痕仪对纯铂进行不同深度的探测。在热处理前、在500 °C下热处理30 min后以及在1000 °C下进一步热处理30 min后，在抛光试样上制作压痕图案。随着压痕深度从50 nm增加到300 nm，测量硬度的变化性降低。当样品退火时，硬度变化也更大。随着位错密度和取样体积的降低，硬度变化增加，表明位错密度在观察到的变化中起着关键作用，超出了仪器的不确定性，并支持基于缺陷的随机行为的解释。看来，随机行为发生时，多个位错存在于采样体积，而不是采样只有一个单一的位错。
Pure platinum was probed with a nanoindenter fitted with a Berkovich tip to various depths. The indent pattern was made on the as-polished specimen prior to heat treating, after heat treating at 500 °C for 30 min, and again after further heat treating at 1000 °C for 30 min. The variability in the measured hardness decreased as the indentation depth increased from 50 to 300 nm. When the sampled was annealed, the hardness variation was also greater. Increasing hardness variation with decreasing dislocation density and sampling volume indicates that dislocation density plays a critical role in the observed variation, beyond solely instrumentation uncertainty, and supports a defect-based explanation for the stochastic behavior. It appears that the stochastic behavior occurs when multiple dislocations are present in the sampled volume rather than sampling only a single dislocation.