As shown in Fig.1, precipitates microstructure confirms that near solvus temperature precipitation can limit grain boundary precipitation.

由调整温度, 五谷降雨雪由生核能量限制并且唯一晶界降雨雪存在。

At the same time the required hypothesis of cohence and non-cohence between second-phase participle and grain boundary is also excluded when the model are worked out from the perspective of geometry.

同时，本文模型还避开了从几何角度推导模型必需的二相粒子与晶界之间的共格或非共格的假设。