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The three-dimensional size, morphology and distribution of Ni4Ti3 precipitates growing in binary Ni-rich Ni-Ti alloys have been investigated via a slice & view procedure in a Dual-Beam FIB/SEM system, in order to better XQGHUVWDQGWKHLULQIOXHQFHRQWKH%WR%∂PDUWHQVLWLFWUDQVI RUPDWLRQ,QWKHSUHVHQWZRUNERWKDVWU ess-free Ni50.8Ti49.2 alloy with all four variants of precipitates and a compressed Ni51Ti49 alloy with aligned precipitates in one family were studied. The Ni4Ti3 precipitates reach a volume fraction of 9.6% in the reconstructed region of the stress- free alloy and 4.3% in the compressed one. In both cases, the mean volume, specific surface area, sphericity and aspect ratio of the precipitates are calculated and the Pair Distribution Functions of the precipitates are obtained. It is shown that most precipitates in the stress-free sample grow larger and have a more lenticular shape, while those in the compressed sample are more cylindrical. Deviations from these ideal shapes reveal internal steps in the stress-free sample and lamellae formation in the compressed one.

3D FIB/SEM study of Ni4Ti3precipitates in Ni-Ti alloys with different thermal-mechanical histories

3D FIB/SEM study of Ni₄Ti₃precipitates in Ni-Ti alloys with different thermal-mechanical histories