Kinetics of the Orientational Long-Range Ordering of Interstitial Hydrogen Atoms in Metals Having Hexagonal-Close Packed Structure

摘要

Using the Onsager-type kinetics equation, the differential equation for the kinetics of orientational long-range order (LRO) parameter for the interstitial H-atoms' distribution within the hexagonal close-packed (h.c.p.) lattice of a metal (Me) is firstly derived. The numerical solutions of this equation enable to analyze the orientational ordering of H atoms. The decreasing of H concentration results in a decelerating of the orientational-LRO parameter change and in an increasing of its relaxation time. Temperature influence on the orientational-ordering process is more appreciable for lower hydrogen concentrations because of the open-chain (two by two) distribution of H atoms in h.c.p. metals.