Metallographic procedures and microstructural characterization results for Carpenter's Custom Age 625 PLUS@ alloy, an age-hardenable, highly corrosion resistant Ni-base alloy, are presented. Characterization was performed by light and electron microscopy techniques as a function of solution annealing and aging temperatures and times. The extremely high corrosion resistance of the alloy makes good etch delineation difficult to obtain. Gamma double prime is the main strengthening phase and it is liner in size than in alloy 718. Dark field TEM imaging is required to observe and identify gamma double prime. Observation of coarse gamma double prime is possible with a field emission scanning electron microscope.
The magnetic and mechanical properties of 49%Co-l.9%V-0.3%Nb-Fe high strength (0,=90 ksi) soft magnetic alloy were studied after aging at 450'C for up to 8 0 0 h . The magnetic induction B (H. = 10 and 2 5 Oe respectively) decreases rapidly in the first 100 h and approaches a lower limit at about 3 0 0 h. The coercive field remains constant during aging. Tensile specimens aged for 2 0 0 h a t 4 5 0 ' C did not show any changes in the room temperature yield stress and elongation. Transmission electron microscopy identified two precipitate phases: NbC and a Laves phase (hcp. a=4.7A, c=7.72A) . The Laves phase appears in grain boundaries and triple-points and inhibits the grain growth therefore enhancing the mechanical properties.
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