POSITRON ANNIHILATION CHARACTERIZATION OF NANOSTRUCTURED FERRITIC ALLOYS OBJECTIVE SUMMARY PROGRESS AND STATUS Introduction   Experimental Procedure sin qr NV mag mag mag knowledge   Dt exp exp exp
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POSITRON ANNIHILATION CHARACTERIZATION OF NANOSTRUCTURED FERRITIC ALLOYS OBJECTIVE SUMMARY PROGRESS AND STATUS Introduction Experimental Procedure sin qr NV mag mag mag knowledge Dt exp exp exp

1 Results of SANS data analysis for radi us r volume fraction f number density N and magnetic to nuclear scattering ratio MN brPage 6br 73 Fig 2 Measured Ip curves characteristic of oxides Y Ti and TiO normalized by dividing with the Ip for unal

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POSITRON ANNIHILATION CHARACTERIZATION OF NANOSTRUCTURED FERRITIC ALLOYS OBJECTIVE SUMMARY PROGRESS AND STATUS Introduction Experimental Procedure sin qr NV mag mag mag knowledge Dt exp exp exp




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Presentation on theme: "POSITRON ANNIHILATION CHARACTERIZATION OF NANOSTRUCTURED FERRITIC ALLOYS OBJECTIVE SUMMARY PROGRESS AND STATUS Introduction Experimental Procedure sin qr NV mag mag mag knowledge Dt exp exp exp"— Presentation transcript:


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68 POSITRON ANNIHILATION CHARACTERIZATION OF NANOSTRUCTURED FERRITIC ALLOYS OBJECTIVE SUMMARY PROGRESS AND STATUS Introduction
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69 Experimental Procedure sin qr NV mag mag mag knowledge
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70 Dt exp exp exp , I d1 d2 d1 d2
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71 sphere rD sphere
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72 Results Fig. 1. Results of SANS data analysis for radi us (r), volume fraction (f), number density (N), and magnetic to nuclear scattering ratio (M/N).
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73 Fig. 2. Measured I(p ) curves characteristic of oxides Y , Ti , and TiO normalized by dividing with

the I(p ) for unalloyed Fe. Fig. 3. PAS OEMS plot normalized to Fe.
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74 Fig. 4. I(p ) curves for Ti and Cr.
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75 Fig. 5. PAS S-W analysis of the NFAs compared to several reference materials. Fig. 6. Expanded plot of S-W analysis performed at LLNL with a line fit to Fe and Y .
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76 Fig. 7. PAS measured lifetimes and relative inte nsities for the controls and yttria containing alloys. The calculated lifetimes in Fe for V , where x is the number of vacancies in a cluster, are shown on the right axis [22].
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77 Table 1. PAS lifetime

data Discussion 'W
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78 Fig. 8. I(p ) curves for the U14YWT alloys for the 3 HIPing temperatures normalized by the corresponding ‘baseline’ curve for the U14WT alloy HIPed at 1150°C, along with the corresponding curves for the oxides. The heavy black dashed line is the Y weighted average and is 0.45 in Fig. a and 0.65 in Fig. b.
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79 Summary and Conclusions Future Work Acknowledgements References
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80
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