应用TEM对Ti-56Al单晶[103]有序畴区位错结构进行研究,并提出修正的钉扎-解钉模型以解释1/2＜110]普通位错不是长而直的纯螺位错及位错碎片不是沿纯螺方向排列等实验现象和反常屈服机制.认为,当TiAl合金中的Al含量较低时,1/2＜110]普通位错控制的反常屈服行为可用Viguier的钉扎-解钉模型解释;当TiAl合金中的Al含量较高时,1/2＜110]普通位错控制的反常屈服行为可用本文提出的修正的钉扎-解钉模型解释.
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