Abstract
The so-called mechanical agitation allows a material system the effective restraint and relaxation which cause some mechanically stimulated reactions (MSR), e.g. mechanical alloying, and it draws the system in a certain dissipative structure. From the common phenomena in the various experimental results belonging to MSR, it can be pointed out that the gradient of plastic strain is a reasonable variable (xr) as that of the thermodynamic intensive variables, in order to express the dissipative function related to the rate of excess entropy production. According to the idea a simple function taking in the thermal activation process is proposed as the evolutional equation (dxr⁄dt) for the non-equilibrium state accomplished by the chemical reaction (r). The hierarchy of phase transformation composed by MSR in the system is qualitatively discussed while considering the behavior of the steady state solution.
