Overview
Nitinol 50 is a nearly equiatomic alloy of nickel and titanium, renowned for its unique shape memory and superelastic properties. Discovered in the 1960s, it has since become critical in advanced engineering and medical applications. The alloy's ability to return to a predefined shape upon heating (shape memory) or under stress (superelasticity) makes it invaluable in dynamic environments. Nitinol 50's name derives from its composition (Ni for nickel, Ti for titanium, and NOL for the Naval Ordnance Laboratory where it was first developed). Its biocompatibility and resistance to fatigue have cemented its role in minimally invasive medical devices, while its durability supports high-performance industrial uses.
Physical and Chemical Properties
Nitinol 50 exhibits a density of 6.45 g/cm³ and a melting range of 1240–1310°C, with phase transformation temperatures adjustable via heat treatment. Its superelasticity allows up to 8% reversible strain, far exceeding conventional metals. The alloy is highly resistant to corrosion in bodily fluids and seawater, attributed to a stable titanium oxide surface layer. Key mechanical properties include a tensile strength of 800–1100 MPa and excellent fatigue resistance, enabling cyclic loading in applications like cardiovascular stents. Thermal conductivity and electrical resistivity are lower than steel, influencing its processing and performance in thermal actuators.
Main Applications
In medicine, Nitinol 50 dominates the production of self-expanding stents, guidewires, and orthodontic archwires due to its biocompatibility and fatigue resistance. Its superelasticity enables compact delivery systems that deploy upon body-temperature exposure. Aerospace applications include deployable satellite components and vibration dampers, leveraging its lightweight and reliability. Industrial uses span robotics (actuators, grippers) and consumer electronics (eyeglass frames, smartphone hinges). The alloy’s energy absorption properties are exploited in seismic damping systems for buildings. Emerging applications include microelectromechanical systems (MEMS) and energy harvesting devices.
Safety and Storage
While Nitinol 50 is generally safe, nickel release from poorly processed alloys may cause allergic reactions. Medical-grade versions must meet ASTM F2063 standards for nickel content (<0.05% extractable). Powder forms require dust control measures to prevent inhalation. Storage should avoid humid or chloride-rich environments to prevent surface pitting. Pre-oxidized or passivated surfaces enhance corrosion resistance. For precision components, store in inert gas or vacuum-sealed packaging to minimize surface contamination.
B2B Procurement Guide
Procure Nitinol 50 from suppliers with ISO 13485 certification for medical applications. Key specifications include transformation temperatures (Af, Ms), cold-work percentage, and traceability for raw materials. For industrial grades, verify mechanical property testing reports (e.g., elongation, cyclic fatigue data). Bulk pricing tiers apply, with discounts for orders exceeding 50 kg. Lead times vary by processing complexity (e.g., laser-cut components may require 6–8 weeks). Consider post-processing costs (electropolishing, shape-setting) when comparing quotes. Preferred forms: wire (Ø 0.1–10 mm), tubing, or custom preformed components.
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