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为了弄清钛中氢破坏机理,我们用超高压电镜直接观察了人工渗氢的工业纯钛板,在拉应力下的氢致破坏行为。实验结果表明,在应力驱动下,氢向裂纹尖端应力集中区扩散与富集,形成氢气团,然后再形成氢化物。由于氢的富集,无论是降低屈服强度,引起低应力塑性变形,还是形成氢化物,都可能促使裂纹继续向前扩展。裂纹的扩展有穿过式和连接式两种形式。从点阵常数的变化,可证明氢的扩散和富集。根据实验结果初步探讨了氢致破坏机理的物理模型。
In order to find out the mechanism of hydrogen destruction in titanium, we observed the hydrogen induced destruction of artificial pure titanium plate by artificial high pressure electron microscope. The experimental results show that under the stress-driven, hydrogen diffuses and accumulates in the stress concentration zone at the tip of the crack to form a hydrogen mass, and then hydride is formed. Due to hydrogen enrichment, both the yield strength reduction, low stress plastic deformation, or the formation of hydride, may promote the crack to continue to expand forward. Crack expansion through and connected two forms. From the lattice constant changes, we can prove that hydrogen diffusion and enrichment. Based on the experimental results, the physical model of hydrogen-induced destructive mechanism is preliminarily discussed.