When the strain is below 0.29, the average grain size decreases obviously with the increase of strain.
当应变小于0.29时，平均晶粒尺寸明显地随应变增大而减小；
Nevertheless, after the strain reaches 0.29, the average grain size decreases slowly with the increase of strain.
当应变达到0.29时，平均晶粒尺寸缓慢地随应变增大而减小。
Ultrafine-grained 2J4 hysteresis alloy processed by equal-channel angular process(ECAP), has the average grain size approximate 0.
利用等通道弯曲挤压的方法得到的晶粒平均尺寸大约为0。
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