基于金属变形理论，论述了金属常温下临界变形后，晶粒快速长大的机理。
Basing on metal deforming theory, the principle of grains growing up quickly after critical deforming of metal under normal temperature are stated.
临界变形区晶粒长大的最初驱动力是晶界两侧的畸变能差。
The primary driving force of coarse grain formation in the critical deformation region is the energy difference of distortion between both sides of grain boundaries.
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