2004 Volume 53 Issue 12 Pages 548-553
Fundamentals of hydrogen behaviors in materials are reviewed with respect to degradation of mechanical properties. The present article is the first part that deals with the states of hydrogen in solid solution. The temperature dependence of the solubility, permeability and technical problems particularly of electrochemical permeation measurement have been explained. The interstitial site of hydrogen and the symmetry of lattice strain have been examined.