采用电子背散射衍射(EBSD)技术研究了冷轧变形Pb-0.1%Ca-1.5%Sn-0.026%Al合金在回复和再结晶过程中的晶界特征分布(GBCD).结果表明:在回复过程中,合金内形成了比例接近50%的平直∑3晶界,这类晶界不处在由一般大角度晶界构成的晶界网络上,不能使合金的GBCD得到优化;相反,在再结晶过程中,除了生成比例超过50%的∑3晶界外,还出现了较多的∑9和∑27等低∑重位点阵晶界(CSL),并且这些晶界和相当多的弯曲的∑3晶界均处在由一般大角度晶界构成的晶界网络上,可以使合金的GBCD得到优化.进一步的分析指出:回复过程中所形成的平直的∑3晶界是共格孪晶界,它们能量很低,很难迁移;在再结晶过程中,除了生成不可迁移的共格的∑3孪晶界外,还可形成大量可迁移的弯曲的非共格∑3晶界,这类晶界的迁移和彼此会合可形成∑9和∑27等∑3n(n为正的整数)晶界,这是合金GBCD得到优化的根源.
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