论文部分内容阅读
通过实验和理论分析研究了氢鼓泡形核、长大和开裂的过程.在充氢试样中发现直径小于100nm未开裂的孔洞,它们是正在长大的氢鼓泡,也发现已开裂的鼓泡以及裂纹多次扩展导致破裂的鼓泡.分析表明,氢和空位复合能降低空位形成能,从而使空位浓度大幅度升高,这些带氢的过饱和空位很容易聚集成空位团.H在空位团形成的空腔中复合成H2就使空位团稳定,成为氢鼓泡核.随着H和过饱和空位的不断进入,鼓泡核不断长大,内部氢压也不断升高.当氢压产生的应力等于被氢降低了的原子键合力时,原子键断开,裂纹从鼓泡壁上形核.
Hydrogen bubbling nucleation, growth and cracking processes were studied experimentally and theoretically.The pores that were less than 100 nm in diameter were uncrushed in hydrogen-filled samples, which were the hydrogen bubbling that was growing up, and the cracked drums were also found Bubble and crack propagation caused by repeated rupture.The analysis shows that the combination of hydrogen and vacancy can reduce the formation of vacancies, so that the vacancy concentration greatly increased, these hydrogen supersaturated vacancies can easily aggregate into a vacant cluster.H Holes formed by the vacancy cluster compound into H2 to make the vacancy cluster stable and become hydrogen bubbling nuclei.With H and supersaturated vacancy continue to enter, the bubbling nuclei continue to grow, the internal hydrogen pressure is also rising.When the hydrogen When the pressure generated is equal to the atomic bonding force reduced by hydrogen, the atomic bonds are broken and the crack nucleates from the wall of the bubble.