Abstract
Spherically shaped, microcrystalline NiTi alloy powder with both nonhomogeneous particle-size distribution (2 to 60μm diameter) and chemical composition, was consolidated with a shock input energy of 316 kJ kg−1. Upon shock compaction, the two-phase NiTi powder particles (containing 45wt% Ti and 65 wt% Ti) were bonded together, generally by interparticle melting and subsequent welding. The melted material at interparticle regions was observed to have rapidly solidified to largely amorphous and/or microcrystalline phases. Particle interiors were also subjected to extensive plastic deformation which resulted in deformation twinning, grain elongation and some recrystallization to defect-free grains. Unique microstructural modifications occurring due to inhomogeneous thermal and mechanical processing during the dynamic consolidation process, are reported here.
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Thadhani, N.N., Vreeland, T. & Ahrens, T.J. Microstructural modifications in a dynamically consolidated microcrystalline nickel titanium alloy powder. J Mater Sci 22, 4446–4452 (1987). https://doi.org/10.1007/BF01132045
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DOI: https://doi.org/10.1007/BF01132045