Role of Stoichiometry on Ordering in Ni-Cr Alloys Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/hd76s360x

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  • Mechanical property degradation due to isothermal ageing is of potential concern for alloys based on the Ni-Cr binary system (e.g., Inconel 690, 625), particularly in nuclear power applications where component lifetimes can exceed 40 years. In the present research, the disorder-order phase transformation, which is the primary mechanism of ageing, has been studied in Ni-Cr model alloys with varying stoichiometry by a combined experimental and computational approach. Experimental measurements of the change in lattice parameter and micro-hardness as a function of aging time and temperature are obtained in order to assess the model accuracy. Samples with different stoichiometry undergo high accuracy isothermal ageing for up to 10,000 hours and are characterized by changes in lattice parameter via X-ray Diffraction (XRD), micro-hardness via nanoindentation, and the presence of a secondary phase imaged via Transmission electron microscopy (TEM) technique.
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