Page 1 Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Page 8 Page 9 Page 10 Page 11 Page 12 Page 13 Page 14 Page 15 Page 16 Page 17 Page 18 Page 19 Page 20 Page 21 Page 22 Page 23 Page 24 Page 25 Page 26 Page 27 Page 28 Page 29 Page 30 Page 31 Page 32 Page 33 Page 34 Page 35 Page 36 Page 37 Page 38 Page 39 Page 40 Page 41 Page 42 Page 43 Page 44 Page 45 Page 46 Page 47 Page 48 Page 49 Page 50 Page 51 Page 52 Page 53 Page 54 Page 55 Page 56 Page 57 Page 58 Page 59 Page 60 Page 61 Page 62 Page 63 Page 64 Page 65 Page 66 Page 67 Page 68 Page 69 Page 70 Page 71 Page 72 Page 73 Page 74 Page 75 Page 76 Page 77 Page 78 Page 79 Page 80 Page 81 Page 82 Page 83 Page 84 Page 85 Page 86 Page 87 Page 88 Page 89 Page 90 Page 91 Page 92 Page 93 Page 94 Page 95 Page 96 Page 97 Page 98 Page 99 Page 100 Page 101 Page 102 Page 103 Page 104 Page 105 Page 106 Page 107 Page 108 Page 109 Page 110 Page 111 Page 112 Page 113 Page 114 Page 115 Page 116 Page 117 Page 118 Page 119 Page 120 Page 121 Page 122 Page 123 Page 1242015 | ANNUAL REPORT 109 Figure 2. Atom probe tomographic ion maps from the neutron irradiated 14YWT NFA (dataset R33_4731). Shown here are Cu, Co, Si, and Mn molecular ion maps. High density Cu zones correspond to NFA dispersoid positions. It can be seen that Cu decorates the NFA clusters. Co and Mn are homogenous. Some Si high density zones occur, but this requires further study. compared to 14YWT irradiated with Fe ions to the same peak dose and irradiation temperature as the neutron irradiated 14YWT (1.7 dpa and 288°C). This self-ion irradiation campaign has been completed at JANNUS in France, in 2014. If 14YWT NFAs are susceptible to α’ precipitation thenAPT will provide information required to calculate valuable metrics such as kinetic informa- tion on their formation.Additionally, data on the precipitates, such as their number density, radii, volumes, and compositions, can also be obtained. This data could also provide insight into whether preferential nucleation occurs at dispersoids or any other local features. This would be advantageous to theorists when trying to study the mechanisms underpinning α’ precipitation within FeCr alloys generally. Secondly, alloy developers would have valuable local compositional information on solute movements, which may help refine their processing methods. Ultimately, the formation of α’ precipitates induces mechanical changes that could shorten the lifetime of that component.There- fore, screening the microstructure of the 14YWT in this manner would provide tokamak engineers information on whether 14YWT could be placed close to the coolants. The 14YWT NFAs have desirable properties for fission applications too. As one of the DOE’s goals is to develop improvements in existing technologies the outcomes of this research may alter material choices for new components that are to be installed on fission plants.