一般的，位相差小于10°的相邻晶粒，其晶界称为小角度晶界；位相差大于10°的相邻晶粒，其晶界称为大角度晶界；此外，相邻晶粒位相差小于2°时，该小角度晶界被称为亚晶界，这种相邻的晶粒结构被称为亚结构或亚晶粒。同时，小角度晶界可分为倾斜晶界、扭转晶界、重合晶界等。翻译成英文为Low Angle Grain Boundaries (LAGB)。与其对应的为高角度晶界，翻译为High Angle Grain Boundaries (HAGB)
小角度晶界的产生速率与小角度晶界转变为较大角度晶界的速率趋向一动态平衡。
There exists a sort of dynamic equilibrium between the formation rate of low-angle grain boundaries and the rate of changing into higher-angle grain boundaries.
小角度晶界向较大角度晶界不断转变的结果使大角度晶界数量不断增加，最终导致晶粒显著细化。
The transformation from low Angle grain boundaries to high Angle grain boundaries makes the number of high-angle grain boundaries increase continuously and finally the grains are refined markedly.
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