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Meeting Materials Science & Technology 2019
Symposium Advanced Manufacturing, Processing, Characterization and Modeling of Functional Materials
Presentation Title Effects of Ni during Thermo-mechanical Processing in Ni-rich NiTiHf High Temperature Shape Memory Alloy
Author(s) Faith Gantz, Nathan A Ley, Robert W Wheeler, Marcus L Young
On-Site Speaker (Planned) Faith Gantz
Abstract Scope Shape memory alloys (SMAs), such as Nickel-Titanium, are multifunctional materials, which have the ability to recover a designed shape upon heating. While binary NiTi SMAs are limited to a maximum austenite finish temperature of 115°C, high temperature SMAs (HTSMAs), such as NiTiHf and NiTiZr, have much higher transformation temperatures that can be tuned for specific applications, which makes them attractive candidates for many aerospace, and energy applications. NiTiHf and NiTiZr have been found to be difficult to process due to the formation of oxides that exacerbate the already brittle nature of the material. In this study, the effect of Ni content in Ni-rich NiTiHf HTSMAs on processability, microstructure, and hardness was analyzed for three compositions. Each composition was characterized in three conditions: homogenized, 25%, and 50% thickness reduction through hot-rolling. Differential scanning calorimetry, scanning electron microscopy, energy dispersive spectroscopy, and Vickers hardness testing were utilized to characterize the resulting materials.
Proceedings Inclusion? Planned: At-meeting proceedings

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Computational Design of Additively Manufactured Compositionally Graded Alloys
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Effects of Hot-isostatic Pressing on the Microstructural and Magnetic Properties Development in Permalloy-80 Manufactured by Laser Powder Bed Fusion
Effects of Laser-beam Defocus on Microstructural Features of Compositionally Graded WC/Co Composites Additively Manufactured by Multi-laser Metal Deposition
Effects of Ni during Thermo-mechanical Processing in Ni-rich NiTiHf High Temperature Shape Memory Alloy
Epitaxial Growth of a Magnetic Shape-memory Alloy: Laser Metal Deposition of Ni-Mn-Ga
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Laser- and Binder-based Additive Manufacturing and Post-processing of Functional Magnetic Materials
Laser Powder Bed Fusion of Ti-rich TiNi Graded Lattice Structures: Process Optimisation, Geometrical Integrity and Mechanical Property
Machine Learning for Solving Metals AM Problems
Magnetic Shielding Promotion in Laser Powder Bed Fusion of NiFeMo Permalloy via Directional Grain Formation and Thermal Post Processing
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