Abstract
Hydrogen diffusion behavior of high-entropy alloy AlCoCrFeNi2.1 was investigated and it was found that the alloy exhibits a low hydrogen diffusion coefficient. Dislocations proliferated greatly in body-centered cubic (BCC) and face-centered cubic (FCC) phases after hydrogenation. Plentiful rhombic net-like morphology appeared on the surface of FCC phase, while abundant nano-scale precipitated phases were found in BCC phases. Subsequent experimental results show that the growth of nano-scale precipitate phases can further delay the hydrogen diffusion and reduce the surface hardness of the alloy. The relationship between the hydrogen-induced evolution caused by hydrogen penetration is strongly correlated with the microstructure and nano-scale precipitate phases in both FCC and BCC phases. Nanophases are found to be responsible for the hydrogen-induced evolution and associated changes in properties of this material.
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