In this study, we used far-field high-energy x-ray diffraction microscopy (FF-HEDM) to measure in 3D the spatial distributions of the sizes, orientations, and residual strains of grains and subgrains formed by room-temperature tensile deformation in a neutron-irradiated (450 °C, 0.01dpa) Fe-9Cr specimen and its unirradiated counterpart. We found that neutron irradiation under this condition alone had no effect on the grain size distribution. After deformation, grains fragmented into subgrains in both unirradiated and irradiated specimens: the irradiated specimen contained a few large subgrains which co-existed with many smaller subgrains, while the unirradiated specimen contained small subgrains with a relatively uniform size distribution. Prior to deformation, the irradiated specimen had higher residual strain spread compared to its unirradiated counterpart, while after deformation to the maximum uniform elongation, the strain distributions among subgrains were similar between the unirradiated and irradiated specimens. The FF-HEDM measurements provide new insight into the effects of neutron irradiation on the mechanical response of Fe-Cr ferritic alloys.

在这项研究中，我们使用远场高能X射线衍射显微镜（FF-HEDM）在3D中测量由室温拉伸变形形成的晶粒和亚晶粒的尺寸，取向和残余应变的空间分布。一个中子辐照的（450°C，0.01dpa）Fe-9Cr样品及其未辐照的样品。我们发现仅在这种条件下进行中子辐照对晶粒尺寸分布没有影响。变形后，未辐照和辐照的样品中的晶粒均破碎成亚晶粒：辐照的样品包含一些大的亚晶粒，并与许多较小的亚晶粒共存，而未辐照的试样则包含尺寸分布相对均匀的小亚晶粒。在变形之前 与未辐照试样相比，辐照试样具有更高的残余应变扩展，而在变形至最大均匀伸长率之后，未辐照试样和辐照试样之间的亚晶粒间应变分布相似。FF-HEDM测量为中子辐照对Fe-Cr铁素体合金机械响应的影响提供了新的见解。