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Invited Lecture

Titanium-Tantalum High Temperature Shape Memory Spring Actuators

Thursday (08.06.2017)
08:30 - 09:10 Förde II + III
Part of:
Line-Up:
12:20 Invited Lecture Similarities and differences between magnetic hysteresis and hysteresis in phase transformations 0 Richard James
13:00 Invited Lecture Discovery and Design of Multifunctional Materials using Combinatorial and High-Throughput Experimentation 1 Prof. Dr. Alfred Ludwig
15:10 Invited Lecture Tuning Mechanical Properties of Spider Cuticle by its Composition and by Structural Gradients 0 Dr. Yael Politi
15:50 Invited Lecture Surfaces and Gels for controlling Calcium Phosphate Deposition 0 Prof. Dr. Andreas Taubert
17:40 Invited Lecture Probing the Structure and Dynamic Behaviors of Ferroelectrics by Electron Microscopy with Atomic Resolution in Real Time 0 Prof. Xiaoqing Pan
18:20 Invited Lecture Magnetoelectric Composites for Energy Harvesting 1 Robert E. Hord, Jr. Professor Shashank Priya
19:40 Invited Lecture Declamping in Lead Magnesium Niobate – Lead Titanate Films 1 Prof. Susan Trolier-McKinstry
20:20 Invited Lecture Integrated Magnetics and Multiferroics for Compact and Power Efficient Sensing, Power, RF, Microwave and mm-Wave Electronics 0 Prof. Nian X. Sun
21:00 Invited Lecture From Maxwell’s displacement current to nanogenerator driven self-powered systems and blue energy 0 Prof. Zhong Lin Wang
21:40 Invited Lecture Magnetoelectric Composites: from Sensors to Sensor Systems 0 Prof. Dr.-Ing. Gerhard Schmidt
22:20 Invited Lecture Metal–insulator transition in vanadium oxides films and its applications 1 Dr. Keisuke Shibuya
00:20 Invited Lecture In operando photoemission spectroscopy of PMN-PT interfaces 0 Prof. Dr. Kai Rossnagel
08:30 Invited Lecture Titanium-Tantalum High Temperature Shape Memory Spring Actuators 1 Prof. Dr. Gunther Eggeler
09:10 Invited Lecture Vortex-antivortex topological structures in multiferroic tunnel junctions 1 Dr. Ana Sanchez
09:50 Invited Lecture Artificial Ferroic Systems 1 Prof. Laura Heyderman
17:40 Invited Lecture Biomimicry at the molecular level: Molecularly imprinted polymers as synthetic antibody mimics 0 Karsten Haupt
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Conventional NiTi-based shape memory alloys

operate as actuators in many different configurations and applications. They

are well established intelligent material systems which presently receive

increasing interest in materials science and technology. One drawback of

NiTi-based shape memory actuators is related to the fact that the one way

effect can only be triggered at temperatures well below 100°C. It would

represent a big step forward, if shape memory actuators with higher switching

temperatures were available. This is the background for research on TiTa-based

shape memory actuators. The underlying metallurgical concepts and the ingot

metallurgy processing route is described. It is shown that the spring actuator

can operate at switching temperatures up to 400°C can be reached. Our spring

actuator shows a martensite start (Ms) temperature close to 300°C and an

austenite finish temperature (Af) close to 350°C. Between Ms and 500°C one

observes the formation of a dementral ?-phase, which hampers the martensitic

transformation. Adding Al to the TiTa alloy allows to delay the formation of

the ?-phase. Relevant aspects concerning the alloy development of

TiTaAl-materials and required operating conditions for TiTaAl-actuators are

reported. Emphasis will also be placed on the functional fatigue behavior

during thermal and thermo/mechanical cycling of high temperature shape memory

actuators. 

 

 

Speaker:
Prof. Dr. Gunther Eggeler
Ruhr-Universität Bochum