Abstract
Abstract The diffusion kinetics of hydrogen in Ti-6Al-4V alloy was investigated by the gaseous hydrogen charging at the initial hydrogen pressures of 0.012, 0.04 and 0.07 MPa and the temperatures of 800, 850 and 900 °C. The results show the variation of the average hydrogen concentration in the alloy with hydrogen charging time exhibits an exponential characteristic relationship at different initial hydrogen pressures or hydrogen charging temperatures. The hydrogen charging process is controlled by the diffusion of hydrogen atoms in Ti-6Al-4V alloy. Based on the solution of diffusion equation, the apparent activation energy of hydrogen diffusion in Ti-6Al-4V alloy is estimated to be 32.80 kJ/mol. This energy is the activation energy of hydrogen diffusion in β phase of Ti-6Al-4V alloy.
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