Heat-Resistant Nickel Alloy René N5

General Technical Characteristics

René N5 is a second-generation, high-temperature, single-crystal nickel-based superalloy developed for manufacturing components that operate under extreme temperatures and significant mechanical loads. Thanks to its rhenium content, the alloy offers high creep resistance and maintains its strength during prolonged operation in the hot sections of gas turbine equipment.

The alloy is used in the aerospace and power-generation industries, particularly for manufacturing high-pressure turbine blades and nozzle guide vanes. Its single-crystal structure helps reduce the influence of grain boundaries on high-temperature performance.

Chemical Composition

Typical nominal chemical composition of René N5, wt.%:

• Nickel (Ni) — balance;
• Chromium (Cr) — approximately 7.0%;
• Cobalt (Co) — approximately 7.5%;
• Molybdenum (Mo) — approximately 1.5%;
• Tungsten (W) — approximately 5.0%;
• Aluminum (Al) — approximately 6.2%;
• Tantalum (Ta) — approximately 6.5%;
• Rhenium (Re) — approximately 3.0%;
• Hafnium (Hf) — approximately 0.15%;
• Carbon (C) — approximately 0.05%;
• Boron (B) — approximately 0.004%;
• Yttrium (Y) — small controlled additions may be present.

Nickel forms the base of the alloy, while aluminum and tantalum contribute to the formation of the strengthening γ′ phase. Rhenium improves creep resistance, while chromium and other alloying elements contribute to resistance against high-temperature oxidation and corrosive environments.

The values listed above are nominal. The actual composition should be verified against the technical documentation and quality certificate for the specific batch.

Mechanical and Operating Properties

The main characteristics of René N5 include:

• High strength at elevated temperatures;
• Enhanced resistance to creep and long-term rupture;
• Stability of the strengthening γ′ phase;
• Resistance to high-temperature oxidation under appropriate operating conditions and with a suitable protective coating;
• Suitability for manufacturing critical single-crystal cast components.

Operating performance depends on the casting process, crystal orientation, heat treatment, protective coatings, and service conditions. Verified manufacturer data should be used for precise engineering calculations.

Applications

René N5 nickel-based superalloy is used to manufacture:

• High-pressure turbine blades;
• Gas turbine nozzle guide vanes;
• Aircraft gas turbine engine components;
• Industrial gas turbine components for power generation;
• Critical hot-section components exposed to high temperatures and prolonged mechanical loads.

The material is suitable for components where heat resistance, creep resistance, and the retention of mechanical strength over an extended service life are essential.

Features of René N5 Alloy

• Single-crystal structure designed for high-temperature operating conditions.
• Rhenium alloying to improve creep resistance.
• Strengthening through the γ′ phase.
• High strength under prolonged loads and at elevated temperatures.
• Use in critical aerospace and power-generation gas turbine components.

When selecting René N5, it is important to consider the required chemical composition, single-crystal structure, heat treatment, and operating conditions of the finished component.

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