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作者利用扫描电镜在逐级加载条件下,对裂尖钝化的全过程进行了研究,提出了除剪切模式外的另一种拉伸型钝化模型。并指出钝化过程中伴随有微观断裂和局部起裂过程。
The authors studied the whole process of crack tip deactivation by using scanning electron microscope under different loading conditions and proposed another tensile passivation model besides shearing mode. It is pointed out that the passivation process is accompanied by microscopic fracture and local cracking process.