高純度アルミニウムのナノインデンテーション試験における自然酸化膜の影響

概要

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Nano-scale mechanical properties, such as hardness, yield load and Youngs modulus of metals, are investigated by using nanoindentation test. However, the results of the test are considerably affected by sample surface condition, nose configuration of tip, and so on. In this study, 99.99% and 99.9999% purity aluminums are exposed in air, and the thicknesses of an oxide layer are measured using an X-ray photoelectron spectroscopy (XPS). To investigate the effect of oxide layer on the yield load and hardness on nano-scale, nanoindentation test is performed on the aluminums with the different oxide layer thickness. The oxide layer thickness increases with the period exposed in air, and the layer thickness of low purity aluminum is higher than that of high purity aluminum. In nanoindentation test, it is revealed that the yield load and hardness are considerably affected by the oxide layer.
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