Graduate Thesis Or Dissertation
 

Acceleration of Long-Range Ordering in NiCrFe Alloys Via Proton Irradiation

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  • This work explores the hypothesis that proton irradiation is a feasible alternative to simulate accelerated thermal aging for Ni2Cr long-range ordered phase formation within NiCr and NiCrFe alloys. In this study, various model alloys and commercial alloys 690 and 690+P (0.01 wt.% P) were subject to 2 MeV proton irradiation to 1.5 displacements per atom (dpa) at 350°C. Identical alloys were isothermally aged for up to 10,000 hours at 360°C and 418°C. Synchrotron X-ray Diffraction (S-XRD) analysis of both the irradiated and thermally aged samples determined phase fractions and precipitate sizes of the Ni2Cr phase, as well as the change in matrix lattice parameter. The irradiated alloys showed formation of Ni2Cr within 690+P and all model alloys, but not alloy 690, and the thermally aged alloys with 5 wt.% Fe or less showed formation of Ni2Cr at 418°C. Aged alloys above 5 wt.% Fe showed no Ni2Cr formation at 10,000 hours. P is found to play a large role in the acceleration of Ni2Cr formation in alloy 690 under irradiation, and minor alloying elements in 690 may help suppress Ni2Cr formation. A direct quantitative comparison of Ni2Cr phase formation between irradiated and thermally aged samples is not feasible with the current aging data; however a minimum acceleration can be determined for all alloys that ordered under irradiation.
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