STRENTHENING MECHANISM OF MODULATED STRUCTURE INITIATED BY SPINODAL DECOMPOSITION
Spinodal分解始发形成调幅组织的强化机制

Through reviewing of a limited number of literatures regarding strengthening mechanism of modulated structure initiated by spinodal decomposition, it is found that the yield strength of aged alloy is mainly dependent on stress field built by the composition different between two precipitate phases which can be characterized by difference between lattice parameter Δa and is independent on modulate wave length and volume fraction of precipitate phase. However, in the ageing courses, the changes in yield stress and Δa did not show a linear relationship. The present author considers that this may be attributed to the local destruction of periodicity of modulated structure, causing change in stress field during ageing and suggests a yield stress equation: σc=MBΔa/a, in which M denotes a sum factor including Taylor (or Schmidt) factor and elastic constants, B, a factor represent the response of local stress field changed the function of Δa/a, Δa, the difference between lattice parameters of two precipitate phases and a, the average lattice parameter. This equation and the B value need to be confirmed and estimated.