High-resolution neutron radiography (∼10 μm) was utilized to quantify hydrogen diffusion under stress in Zircaloy nuclear fuel cladding materials. A notched Zircaloy-4 plate with ∼600 wppm hydrogen underwent a thermo-mechanical test to allow hydrogen in solid solution to diffuse solely under a stress raiser. After the test, neutron radiography revealed an elevated concentration field at the notch, with a hydrogen gradient detectable over 700 μm and a maximum elevation of 130 wppm. Finite element computation was then performed by employing the Cauchy stress tensor and hydrogen-induced anisotropic transformation trains as the driving force of hydrogen diffusion.

高分辨率中子射线照相术（〜10μm）用于量化Zircaloy核燃料包壳材料在应力下的氢扩散。带缺口的Zircaloy-4板含约600 wppm的氢，经过热机械测试，以使固溶体中的氢仅在应力提升器下扩散。测试后，中子射线照相术显示出凹口处的浓度场升高，可检测到700μm以上的氢梯度，最大升高量为130 wppm。然后，通过使用柯西应力张量和氢诱导的各向异性转变序列作为氢扩散的驱动力，进行了有限元计算。