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                <term xml:lang="en">Superelasticity</term>
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              <p>Nitinol is used in dental tools for its superelasticity, shape memory and biocompatibility. Selective laser melting(SLM) on a powder bed is a potential process for manufacturing such as dental tools. Microstructural studies areconducted on NiTi-SLM using a parallel strip strategy and 90◦ laser beam rotation. The multi-scale (nano-, micro-and mesoscopic) microstructure is revealed. Similar “cast” type microstructure features are found. The SLM meltis casted in a “micro-mold”. Fine micro-grains with random crystallographic orientation are formed near themold walls and served as seats for the rapid growth of columnar dendritic grains along the 〈0 0 1〉 direction withepitaxial crystallographic relationships. The growth of the columnar grains curves towards the center of the“micro-mold”, coinciding with the center of the laser beam. It is proposed that SLM processing resembles“Metallic Self Micro-Mold Casting” (MSμMC) and/or “Self Micro-Molding” (S2M).</p>
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