Relaxation of order (both long range and short range) in bcc binary alloys is worked out theoretically based on the vacancy mechanism of atomic migration using the pair approximation of the Path Probability method. Concepts of relaxation times and relaxation modes in states far from the equilibrium are examined. A peculiar isothermal relaxation process in three distinct steps is explained in terms of coexistence of many relaxation modes and their intercouplings. Transitions into and out of frozen-in state due to cooling and heating of the system with finite rates of temperature change are discussed in analogy to phenomena which accompany the glass transition.