UNS N14077 (Modified) / 1.3960 (Modified) / Ni77Mo5Cu2

77NMD – Nickel-Molybdenum Soft Magnetic Alloy

General Characteristics

77NMD is a specialized nickel-based soft magnetic alloy with molybdenum addition, featuring unique combination of:
✔ Exceptionally high initial permeability
✔ Minimal coercive force
✔ Low hysteresis losses
✔ Stable characteristics across wide temperature range

Chemical Composition

Magnetic Properties

• Initial permeability (μi): 100,000-150,000

• Maximum permeability (μmax): up to 400,000

• Coercive force (Hc): 0.4-0.8 A/m

• Saturation induction (Bs): 0.75-0.85 T

• Resistivity: 55-60 μΩ·cm

Physical-Mechanical Properties

• Density: 8.7 g/cm³

• Melting point: ≈1450°C

• Hardness (HV): 120-150

• Tensile strength: 400-500 MPa

• Elongation: 25-35%

Processing Features

1. Heat Treatment:

   • Hydrogen annealing at 1100-1200°C

   • Slow cooling (50-100°C/hour)

2. Mechanical Processing:

   • Excellent stamping characteristics

   • Capable of thin rolling (down to 0.02 mm)

   • Suitable for complex machining

Main Applications

Precision Instruments:

• Sensitive magnetic field sensors

• Ultra-precision transformers

• Class 0.1-0.05 measuring devices

Special Equipment:

• Navigation system components

• High-efficiency magnetic shields

• Magnetostrictive devices

Electrical Engineering:

• Pulse transformer cores

• High-Q inductors

• Magnetoelectric system components

Comparison with Alternatives

Delivery Forms 77NMD