塑性变形对Cu-Ni-Fe合金失稳分解组织不连续粗化的影响

EFFECT OF PLASTIC DEFORMATION ON DISCONTINUOUS COARSENING OF SPINODALLY DECOMPOSED MICROSTRUCTURE IN Cu-Ni-Fe ALLOY

固溶处理后的塑性变形能促进Ｃｕ－Ｎｉ－Ｆｅ合金时效过程中失稳分解组织的不连续粗化塑性变形程度对不连续粗化组织的最终形态有明显的影响：变形程度较小时（７５％）；组织呈近片展状；变形程度增大后（９８％）；组织呈近等轴状失稳分解组织不连续粗化转变的动力学可以用ＪＭＡ方程很好地描述，７５％变形时的Ａｖｒａｍｉ指数约为１．

Plastic deformation prior to aging has profoundly enhanced the discontinuous coarseningreaction of the spinodally decomposed microstructure in Cu-Ni-Fe alloy. The extent of plastic deforma-tion has obvious effect on the morphology of discontinuous coarsening: when the deformation is relativelysmall (75% reduction in thickness), the morphology of discontinuous coarsening almost changs into lamellarmicrostructure; when the deformation is large (98% reduction in thickness), the morphology of discontin-uous coarsening transforms into equiaxed structure. The kinetics of the discontinuous coarsening canbe described by the Johson-Mehl-Avrami equation very well, and the Avrami exponent of the sampledeformed by 75% reduction is about 1.