The results show that grain size is significantly refined due to the sharply increases of dislocation density in grain resulting in dislocation tangle after one-turn pressing.

结果表明挤压一次后，晶粒内位错密度急剧增加，形成位错纠缠，晶粒细化效果最明显；

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The results show that Widmansttten structure needle consists of many blocky subgrains that have higher dislocation density and subgrain boundary is made up of dislocation tangle.

结果表明，魏氏组织针由多个块状的亚晶粒组成，亚晶粒边界由位错缠结而成，在亚晶粒内有较高的位错密度；

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