subgrain boundary
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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；
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.
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