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- W26843186 abstract "An investigation has been conducted to explore the importance of local crack tip electrochemical processes in precipitation-hardened Ni-Cr-Fe alloys driven by galvanic couples between grain boundary precipitates and the local matrix. The electrochemical behavior of ..gamma..(Ni/sub 3/Al,Ti) has been determined as a function of titanium concentration, temperature, and solution pH. The electrochemical behavior of Ni-Cr-Fe solid solution alloys has been investigated as a function of chromium content for a series of 10 Fe-variable Cr (6-18%) - balance Ni alloys, temperature, and pH. The investigation was conducted in neutral and pH 3 solutions over the temperature range 25-300/sup 0/C. The results of the investigation show that the electrochemical behavior of these systems is a strong function of temperature and composition. This is especially true for the ..gamma.. (Ni/sub 3/(Al,Ti) system where a transition from active/passive behavior to purely active behavior and back again occurs over a narrow temperature range near 100/sup 0/C. Behavior of this system was also found to be a strong function of titanium concentration. In all cases, the Ni/sub 3/(Al,Ti) phase was active with respect to the matrix. The peak in activity near 100/sup 0/C correlates well with accelerated crack growth in this temperature range, observed in nickel-basemore » alloy X-750 heat treated to precipitate ..gamma.. on the grain boundaries.« less" @default.
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- W26843186 date "1987-01-01" @default.
- W26843186 modified "2023-09-26" @default.
- W26843186 title "The role of microstructure in environmentally assisted cracking of Ni-base alloys" @default.
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