B2-NiAl Strengthened PH 13-8 Mo Steel Under Fe+ Ion Irradiation: Precipitate Stability and Interaction with Damage
Zijing Huang1, Roudi Yang1, Ming Chen1
1College of Energy, Xiamen University, Xiamen 361005, China.
Abstract:
To investigate the radiation stability of the intermetallic in PH 13-8 Mo steel, precipitates with different sizes were generated and then the samples are irradiated with 400 keV Fe+ at room temperature with maximum damage up to 8 dpa. The pre- and post-irradiation samples are examined with selected area electron diffraction (SAED), scanning transmission electron microscopy (STEM) and Energy Dispersive Spectroscopy (EDS). Before the irradiation, B2 NiAl precipitates are uniformly distributed in matrix with increased sizes of 2.5, 4.9 and 8.1 nm. After the irradiation, the intensity of SAED superlattice pattern of B2 NiAl with 8.1 nm diminishes rather than disappeared in the remaining samples, indicating that the ordered B2 structure of NiAl precipitates of smaller size are mostly destroyed. EDS results proves that no elemental diffusion took place between the precipitates and matrix. Moiré fringes are found to be located beside dissolved precipitates attributed to radiation-enhanced diffusion. This work will provide advice for the material design of other intermetallic strengthened alloys especially in nuclear applications.
Related Concept Videos
Nuclear Stability
To hold positively charged protons together...
Nuclear Transmutation
Corrosion of Reinforcement
However, over time and under certain conditions like carbonation, chloride ingress, and cracking this protective state can be compromised. Steel has areas with...
Long-patch Base Excision Repair
Nuclear Overhauser Enhancement (NOE)


