Shape Memory Characteristics of NiTi Alloy Wire under Various Constrained Stresses

Yan Feng Li; X.J. Mi; Xiang Qian Yin; H.F. Xie

doi:10.4028/www.scientific.net/AMR.567.135

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Effects of Processing Technic on Grain Size of Copper Clad Steel Wire
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Microporous Bio-Membrane Materials Based on High Molecular Weight Polylactide and Low Molecular Weight Poly(ethylene glycol)
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Preparation of ZnAl₂O₄ Spinel Directly from Zinc Aluminum Layered Double Hydroxide Precursor
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Process Mineralogy of an Oolitic Hematite Ore and its Implications for Mineral Processing
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Shape Memory Characteristics of NiTi Alloy Wire under Various Constrained Stresses
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Simulation of Casting Process for Ductile Iron Wind Generator Rotor Shaft
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Study on Automobile Body Performance of Honeycomb Sandwich Composite Material
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The Study of SiC Substrate MgB₂thick Films Growing along C Axis
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The Study of Microstructure and Electric Resistivity of SiC Thin Films Produced by MF Magnetron Sputtering
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Shape Memory Characteristics of NiTi Alloy Wire under Various Constrained Stresses

Abstract:

The present research aims to understand the transformation temperatures and recovery strain of NiTi wires during heating and cooling under various constrained stresses. Both constrained stress and annealing temperature have significant effects on the shape memory characteristics. In general, increasing constrained stress causes an increase of the austenitic and martensitic transformation temperatures and a decrease of the recovery strain. This effect can be attributed to that the constrained stress inhibits the austenitic transformation, and thus more volume fraction of the martensite is retained during heating. The high annealing temperature leads to the decrease in the recovery strain.