【作者】 单广斌； 王勇围； 李金许； 乔利杰； 褚武扬；

【Author】 SHAN GuangBin WANG YongWei LI JinXu QIAO LiJie CHU WuYang(Department of Materials Physics, University of Science and Technology Beijing, Beijing 100083,China)

【机构】 北京科技大学材料物理与化学系；

【摘要】 研究ZrTiNiCuBe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 <2 0mA 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≥2 0mA cm2 后,无载荷下充氢能产生氢损伤,恒载荷下发生滞后断裂时KⅠH KⅠC从0 .63降为0 .2 6。氢鼓泡形成后,随着氢的继续进入,会发生不连续长大,即鼓泡的解理扩展,鼓泡内部压力下降从而止裂。当一定量原子氢进入后,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更多还原

【Abstract】 Hydrogen-induced fracture behavior, such as initiation, propagation and broken of hydrogen blistering and hydrogen-induced delayed fracture under constant load in bulk metallic glass of ZrTiNiCuBe was focused. The results show that when charging current density, i, is smaller than 20?mA/cm², there are no hydrogen blisterings and microcracks on the surface of the specimens and the normalized threshold stress intensity factor is (K_ⅠH/K_ⅠC=)0.63, where K_ⅠC is the fracture toughness. When i is equal to or larger than 20?mA/cm², hydrogen blisterings and microcracks appear in the specimen without load. On the other hand, when i≥20?mA/cm², (K_ⅠH/K_ⅠC) decreases from 0.63 to 0.26. The growth of hydrogen blistering is uncontinuous even though hydrogen atoms enter continuously into it. Only when the inner pressure is large enough to a critical value, the stable blistering propagates again and leads to cleavage fracture surface with arrested lines.更多还原