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Author: Eckert, Jürgen × DDC: 620 × Subject: additive manufacturing ×

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    Phase formation, thermal stability and mechanical properties of a Cu-Al-Ni-Mn shape memory alloy prepared by selective laser melting
    (São Carlos : Universidade Federal de São Carlos, 2015) Gargarella, Piter; Kiminami, Cláudio Shyinti; Mazzer, Eric Marchezini; Cava, Régis Daniel; Basilio, Leonardo Albuquerque; Bolfarini, Claudemiro; Botta, Walter José; Eckert, Jürgen; Gustmann, Tobias; Pauly, Simon
    Selective laser melting (SLM) is an additive manufacturing process used to produce parts with complex geometries layer by layer. This rapid solidification method allows fabricating samples in a non-equilibrium state and with refined microstructure. In this work, this method is used to fabricate 3 mm diameter rods of a Cu-based shape memory alloy. The phase formation, thermal stability and mechanical properties were investigated and correlated. Samples with a relative density higher than 92% and without cracks were obtained. A single monoclinic martensitic phase was formed with average grain size ranging between 28 to 36 μm. The samples exhibit a reverse martensitic transformation temperature around 106 ± 2 °C and a large plasticity in compression (around 15±1%) with a typical “double-yielding” behaviour.
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    Selective laser melting of Ti-45Nb alloy
    (Basel : MDPI, 2015) Schwab, Holger; Prashanth, Konda Gokuldoss; Löber, Lukas; Kühn, Uta; Eckert, Jürgen
    Ti-45Nb is one of the potential alloys that can be applied for biomedical applications as implants due to its low Young’s modulus. Ti-45Nb (wt.%) gas atomized powders were used to produce bulk samples by selective laser melting with three different parameter sets (energy inputs). A β-phase microstructure consisting of elliptical grains with an enriched edge of titanium was observed by scanning electron microscopy and X-ray diffraction studies. The mechanical properties of these samples were evaluated using hardness and compression tests, which suggested that the strength of the samples increases with increasing energy input within the range considered.