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Meeting Materials Science & Technology 2019
Symposium Advanced Manufacturing, Processing, Characterization and Modeling of Functional Materials
Presentation Title Effects of High Temperature Oxides on the Thermomechanical Properties of NiTiHf20 Shape Memory Alloy Wires
Author(s) Avery W. Young, Robert W Wheeler, Nathan A Ley, Othmane Benafan, Marcus L Young
On-Site Speaker (Planned) Avery W. Young
Abstract Scope High temperature shape memory alloys (HTSMAs) show potential for improving aircraft fuel-efficiency and reducing the mass of payloads launched into orbit and beyond. The superior work output demonstrated by NiTiHf HTSMAs has established this alloy system as a prime candidate for HTSMA actuators in aerospace applications. In this presentation the processability of NiTiHf wires is addressed. Hot-extruded Ni50.7Ti29.4Hf19.9 rods with an initial diameter of 6.35 mm, were hot-rolled at 725, 750, 775, and 800C, respectively, to a final diameter of ≈ 1.9 mm, across 32 non-consecutive hot passes. To investigate the influence of high temperature oxides (formed during hot-rolling) on mechanical properties, thermomechanical testing, verified with digital image correlation (DIC) strain mapping, was performed on oxidized & cleaned Ni50.7Ti29.4Hf19.9 HTSMA wires. This comparative study provides insight into the failure mechanisms associated with high temperature Ni(Ti,Hf) oxides, and demonstrates how wire ductility and overall functionality can be improved through oxide removal.
Proceedings Inclusion? Planned: At-meeting proceedings

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Computational Design of Additively Manufactured Compositionally Graded Alloys
Connecting Process Parameters to Grain Structure of Parts Produced by Laser Powder-bed Fusion Additive Manufacturing Using a Monte Carlo Potts Model
Design-Processing-Properties of Alternating/Multi-Layered, Metal-ceramic Composites Fabricated via Laser-based Additive Manufacturing
Direct Energy Deposition Material Process Validation for Remanufacture, Restoration, and Coating for Ground Vehicle Systems
Effects of Heat Treatments on H-phase Growth in Thermo-mechanically Processed NiTiZr
Effects of High Temperature Oxides on the Thermomechanical Properties of NiTiHf20 Shape Memory Alloy Wires
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
Integrated Heat Transfer and Material Model to Predict Magnetic Field-induced Strain in an Additively Manufactured Magnetic Shape Memory Alloy
Investigating SOFC Electrode Microstructures and Performance Degradation: A High Throughput Integrated Model
Investigation of the Deposition Mechanism of Nano-CeO2 Catalyst within SOFC Electrodes using Bio-adhesive Catechol Surfactants
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
Microstructure and Thermoelectric Properties of [001]c Grain-aligned Ca3Co4O9 Ceramics Prepared by Template Grain Growth
Numerical Modeling of Solid Scrap Melting above Bath in an Electric Arc Furnace
On the Effect of the Build Direction in Mechanical Fatigue Life of the SLM Fabricated NiTi
Optimization of Process Parameters for Additive Manufacturing of High Temperature Shape Memory Alloys
Optimizing Additive Manufacturing of NiTi by Controlling Linear and Volumetric Energy Densities
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P2-38: The Solid Oxide Fuel Cell NiO Based and Microstructure Surface Fractal Characterization
P2-39: Effects of Cooling Rate and Ti Addition on Microstructure, Mechanical Properties and Corrosion Characteristics of Laser Deposited Ti-6Al-4V Alloy
P2-40: Grain Boundary Character Distributions (GBCDs) of Annealed YIGs
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Protonic Ceramic Electrolyzer Cells Manufactured by a Novel Laser 3D Printing Technique
Reactive Flash Sintering of Functional Ceramics
Synchrotron Radiation X-ray Diffraction Measurements on Non-metallic Inclusions and their Effect on Fatigue Life in NiTiHf High Temperature Shape Memory Alloys
The Influence of Heat Treatment on the Transformation Behavior of Additively Manufactured NiTiHf Shape Memory Alloys
The Influence of Thermal Cycling on the Indentation-Induced Two-way Shape Memory Effect in NiTi Alloys

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