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Processing and property assessment of NiTi and NiTiCu shape memory actuator springs
Published in
2008
Volume: 39
   
Issue: 8
Pages: 499 - 510
Abstract
Among the multifarious engineering applications of NiTi shape memory alloys (SMAs), their use in actuator applications stands out. In actuator applications, where the one-way effect (1WE) of NiTi SMAs is exploited, SM components are often applied as helical coil springs. Ingots are generally used as starting materials for the production of springs. But before SM actuator springs can be manufactured, the processing of appropriate wires from NiTi ingots poses a challenge because cold and hot working of NiTi SMAs strongly affect microstructure, and it is well known that the functional properties of NiTi SMAs are strongly dependent on their microstructure. The objective of the present paper is therefore to produce binary Ni50Ti50 and ternary Ni40Ti50Cu10 SMA actuator springs, starting from ingots produced by vacuum induction melting. From these ingots springs are produced using swaging, rolling, wire drawing and a shape-constraining procedure in combination with appropriate heat treatments. The evolution of microstructure during processing is characterized and the mechanical properties of the wires prior to spring-making are documented. The mechanical and functional characteristics of the wires are investigated in the stress-strain-temperature space. Finally, functional fatigue testing of actuator springs is briefly described and preliminary results for NiTi and NiTiCu actuator springs are reported. © 2008 WILEY-VCH Verlag GmbH & Co. KGaA.
About the journal
JournalMaterialwissenschaft und Werkstofftechnik
ISSN09335137
Open AccessNo
Concepts (38)
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    ACTUATOR SPRINGS
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    Engineering applications
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    FUNCTIONAL CHARACTERISTICS
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    FUNCTIONAL FATIGUES
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    Functional properties
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    HELICAL COILS
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    NITI AND NITICU SHAPE MEMORY ALLOYS
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    NITI SHAPE MEMORY ALLOYS
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    Properties
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    PROPERTY ASSESSMENTS
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    SHAPE MEMORY ACTUATORS
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    SMA ACTUATORS
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    Starting materials
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    STRESS STRAINS
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    Thermomechanical processing
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    Vacuum induction melting
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    Actuators
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    Alloys
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    Applications
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    Cold working
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    Copper
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    Data storage equipment
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    Fatigue testing
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    Heat treatment
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    Hot working
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    Ingots
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    Mechanical properties
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    Metal castings
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    METAL WORKING
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    Metallic compounds
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    Microstructural evolution
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    Microstructure
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    Nickel alloys
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    Shape memory effect
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    Vacuum applications
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    Wire
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    WIRE DRAWING
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    Springs (components)