脉冲离子束辐照致TiD_2膜力学性能的变化

Changes of Mechanical Properties of TiD_2 Film Irradiated with High Intense Pulsed Ion Beam

金属氢化物(MH_x)应用于反应堆中子慢化剂、激光离子源片材料、中子发生器用靶时,会经历极端非平衡束流的辐照。本工作提出利用TEMP-6型强流脉冲离子束装置产生的强流脉冲离子束(high intensity pulsed ion beam,HIPIB)辐照Ti D_2膜,评估极端束流对膜力学性能的影响因素和影响程度。采用涂层附着力自动划痕仪、维氏显微硬度计对原始和辐照后的Ti D_2膜进行测试分析。研究结果发现:多次HIPIB的辐照效应导致膜面重熔再结晶,使其内部结构趋于更加致密化和平整化,能降低材料的摩擦系数并在一定程度上提高其初始临界载荷;D的释放有助于膜面韧性、显微硬度的提高,从而减轻了其塑性形变程度。

Metal hydride（MH_x） will undergo extreme non-equilibrium irradiations when it is used as a neutron moderator in nuclear reactor,an ion source in laser, a target material for neutron generator, or other devices. This work proposed using a high intensity pulsed ion beam（HIPIB） to evaluate the effects on mechanic properties of Ti D_2 film under non-equilibrium irradiations. Both microscratch and microhardness were measured for the original and the irradiated samples. Results show that repetitive irradiations cause remelting and recrystallization; thus the texture becomes denser and smoother, the frictional coefficient of the samples decreases and the initial critical load increases. The release of D can also improve both of its hardness and toughness, alleviating the plastic deformations.