ANELASTICITY.

Abstract

Modern theories of hydrogen embrittlement such as the decohesion theory and the dislocation transport theory take into consideration, respectively, the influence of lattice-dissolved hydrogen on the interatomic bond strength and the association and movement of hydrogen with dislocations. These features are related to the elastic and anelastic properties of binary or, more often, multicomponent alloy systems. The low solubility of hydrogen in bcc iron and the high mobility of lattice-dissolved hydrogen render any experimental investigation of these effects difficult; therefore, much of the information in the older literature is unreliable. More promising are recent results obtained using sensitive methods based mainly on internal friction and magnetic disaccommodation techniques.