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研究了Zr41.2Ti13.8Ni10Cu12.5Be22.5块状非晶在充氢过程中氢致滞后断裂规律以及氢鼓泡的形核、长大及破裂过程.结果表明,当充氢电流i<20 mA/cm2时,不出现氢损伤(鼓泡及微裂纹),但在恒载荷条件下能发生氢致滞后断裂,其归一化门槛应力强度因子为KIH/KIC=0.63.当i>20 mA/cm2后,无载荷下充氢会产生氢损伤,恒载荷下发生滞后断裂时KIH/KIC从0.63降为0.26.氢鼓泡(直径约为30 nm)形核时的内压pi≈3.6 GPa.随氢的进入,鼓泡不断长大;内压增大至pC≈3.9 GPa时,鼓泡就会解理扩展变成裂纹;但扩展20-30 μm后,内压下降从而止裂.当一定量原子氢进入氢鼓泡后,它又能解理扩展,从而在鼓泡边缘局部解理断口上可以观察到止裂线.
The hydrogen-induced hysteresis rupture and the nucleation, growth and rupture process of hydrogen bubbling in Zr41.2Ti13.8Ni10Cu12.5Be22.5 massive amorphous were investigated. The results show that when the charge current i <20 mA / cm2, hydrogen damage (bubbling and microcracking) did not occur, but hydrogen induced hysteresis fracture occurred under constant load, and the normalized threshold stress intensity factor was KIH / KIC = 0.63. When i> 20 mA / cm 2, hydrogen-induced hydrogen damage can be produced under no load, and the KIH / KIC decreases from 0.63 to 0.26 at constant load with delayed fracture pi ≈ 3.6 GPa, when bubbling hydrogen (about 30 nm in diameter). With the entry of hydrogen, bubbling continues to grow; when the internal pressure increases to pC≈3.9 GPa, the bubble will cleave and expand into a crack; but after the expansion of 20-30 μm, the internal pressure will drop and stop. After the atomic hydrogen has been bubbled into hydrogen, it can then deconsolidate and expand, so that a crack arrest line can be observed at the cleavage fracture at the bubbling edge.