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The shape memory effect of nickel memory springs originates from the reversible phase transformation process of its internal microstructure with temperature changes. In the high-temperature austenite phase state, the spring has a specific initial shape. When the temperature decreases to the martensite phase transformation temperature range, the internal structure of the alloy transforms into the martensite phase, at which point the spring can undergo plastic deformation under external force. However, when the spring is heated again and the temperature rises above the austenite phase transformation temperature, the martensite phase will reverse to the austenite phase, and the spring will automatically recover to its pre-deformed state, as if it “remembers” its initial shape. For example, in some temperature control devices, the nickel memory spring is stretched and deformed at low temperatures. When the ambient temperature rises to the set value, the spring quickly recovers to its original state, thereby triggering corresponding mechanical actions or circuit switches.
Nickel U-shaped retaining rings are made of shape memory alloy material. They possess shape memory effect and superelasticity, and can recover their initial U-shape through temperature changes after deformation under force. The elastic strain capacity reaches 8%, providing stable and lasting clamping force. Their dense oxide film surface provides excellent corrosion resistance, allowing them to work stably in humid, acidic, and alkaline environments. They also possess biocompatibility, are non-toxic and non-irritating, have strong high and low temperature resistance, are unaffected by extreme temperature environments, and have stable mechanical properties.
Nickel plates, primarily composed of nickel (Ni) and titanium (Ti) in near-equal atomic ratios, are a class of metallic materials with a combination of excellent properties. They exhibit shape memory effect, recovering their preset shape upon heating; superelasticity, recovering after large deformations; good biocompatibility, with no rejection or toxicity, allowing for implantation in the human body; and strong corrosion resistance, suitable for complex environments such as seawater and chemicals.
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