As the pass number of pressing increases, the portion of high-angle grain boundaries increased.
随着道次的增加，大角度晶界的比例也跟着增加。
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。
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.
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。
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