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Quantitative Reconstruction of Unique Three-Dimensional Ni 4Ti 3 Network in a Porous Ni 50.8Ti 49.2 Alloy Undergoing a Two-Step Martensitic Transformation

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Document pages: 15 pages

Abstract: A three-dimensional configuration of Ni4Ti3 network in a porous Ni50.8Ti49.2 alloy has been reconstructed by slice-and-view in a Focused Ion Beam Scanning Electron Microscope. Parallel Ni4Ti3 precipitates are found to grow alongside surface of a micro-pore while nano-voids do not affect their growth. Dense Ni4Ti3 occupies 54 of the volume in the Austenite matrix. Their small average local thickness and interspace around 50 nanometers allow the coherency with the matrix, and further induce R-phase (a Martensite phase) transformation in the matrix. A discontinuous matrix segmented by the Ni4Ti3 network and pores is responsible for the gradual transformation by stalling martensite propagation.

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