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采用电子背散射衍射(EBSD)技术研究了固溶处理的304不锈钢经6%-50%冷轧变形后在1173 K下进行长时间(24-96 h)退火后的晶界特征分布(GBCD).结果表明,经小变形(约6%)冷轧退火后的样品出现了较多的∑3n(n=1,2,3)特殊晶界,较好地隔断了一般大角度晶界网络的连通性.通过基于EBSD的单一截面迹线法对共格和非共格∑3晶界进行了区分测定,显示被优化的晶界特征分布中,非共格∑3孪晶界是其主要部分.进一步分析指出,非共格∑3晶界的迁移和反应与基于退火孪晶的中低层错能金属材料GBCD优化密切相关.

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