About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
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Symposium
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Additive Manufacturing and Cellular/Lattice Structures: Designs, Realization and Applications
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Presentation Title |
Laser-based 4D Printing of Ni-Mn-Ga Magnetic Shape Memory Alloys Lattice Structures |
Author(s) |
Anastassia Milleret, Ville Laitinen, Nour-eddine Fenineche, Moataz M. Attallah |
On-Site Speaker (Planned) |
Anastassia Milleret |
Abstract Scope |
This study investigates the influence of L-PBF process parameters (laser power, scan speed, hatch spacing and scanning strategy) on the relative density, microstructure and geometrical integrity of lattice specimens made from a gas atomised Ni-Mn-Ga powder doped with excess Mn. The specimens showed a homogenous chemical composition, and crystal structure consisting of seven-layered modulated (14M) martensite. After homogenisation at 1040 °C for 24 h, the specimens exhibited typical composition dependent phase transformations and a bamboo-like microstructure consisting of large grains spanning the thickness of the struts. The grains show a microstructure with typical stripe-like surface relief originating from martensitic twins. In addition, the influence of the lattice geometries on the magnetic properties is investigated. Further work will focus on developing a new design and post-processing routes to enhance the magnetic properties and to control the crystallographic texture. |