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Improvement of Corrosion Fatigue Strength for TiNi Shape Memory Alloy
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Improvement of Corrosion Fatigue Strength for TiNi Shape Memory Alloy
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Journal Article
Improvement of Corrosion Fatigue Strength for TiNi Shape Memory Alloy
2016
Overview
In this study, we enhanced the corrosion fatigue life of a TiNi shape-memory alloy wire using a thermal oxidation treatment technique that can generate a passive layer on the wire surface. We followed the following procedure for the thermal oxidation treatment. First, the as-received material with an oxide film was mechanically polished to remove the film using an abrasive paper and a buffing compound. Second, the material was heat-treated in an electrical furnace filled with an N2-20 vol% O2 gas for 1 h at 673 K. Subsequently, the material was allowed to cool in the furnace. The results of this treatment are summarized as follows. (1) A passive layer was uniformly generated on the surface of the TiNi shape-memory alloy wire via thermal oxidation on a macroscopic scale; this significantly improved its corrosion resistance. (2) Thermal oxidation extended the corrosion fatigue life of the treated material more compared with HT in air. In addition, we found that the layer generated via the thermal oxidation treatment can maintain adhesion to the base material even when subjected to a bending strain greater than 1%.
Publisher
Trans Tech Publications Ltd
Subject
ISBN
9783035710243, 3035710244
