KINETICS OF THE ORIENTATIONAL LONG-RANGE ORDERINGOF INTERSTITIAL HYDROGEN ATOMS IN METALS HAVINGHEXAGONAL-CLOSE PACKED STRUCTURE

摘要

Using the Onsager-type kinetics equation, the differential equation for thekinetics 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 firstlyderived. The numerical solutions of this equation enable to analyze the orientationalordering of H atoms. The decreasing of H concentration results in a decelerating of theorientational-LRO parameter change and in an increasing of its relaxation time.Temperature influence on the orientational-ordering process is more appreciable forlower hydrogen concentrations because of the open-chain (two by two) distribution ofH atoms in h.c.p. metals.