HyMu "80" Electronic Alloy,MIL-N-14411 B (MR); ASTM A-753-78,HyMu “80” alloy ,E FORU

### **Product Introduction: HyMu "80" Electronic Alloy** **HyMu "80" Electronic Alloy** is a high-permeability nickel-iron soft magnetic alloy specifically engineered for critical electronic applications requiring exceptional magnetic performance. This specialized alloy is manufactured in compliance with MIL-N-14411 B (MR) and ASTM A-753-78 specifications, offering superior magnetic properties combined with excellent mechanical characteristics. The alloy's optimized composition provides maximum magnetic permeability with minimum core loss, making it ideal for sensitive electronic components and precision magnetic devices. The alloy demonstrates exceptional performance in low-field applications where high permeability and low hysteresis losses are critical requirements, establishing it as a premier material for advanced electronic and electrical applications. --- #### **1. Chemical Composition (Weight %)** The chemical composition of HyMu "80" alloy per MIL-N-14411 B (MR) is as follows: | Element | Content (%) | Element | Content (%) | |---------|-------------|---------|-------------| | **Nickel (Ni)** | 78.0 - 81.0 | **Molybdenum (Mo)** | 3.75 - 4.25 | | **Manganese (Mn)** | 0.30 - 0.70 | **Silicon (Si)** | 0.10 - 0.30 | | **Carbon (C)** | 0.02 max | **Iron (Fe)** | Balance | | **Sulfur (S)** | 0.015 max | **Phosphorus (P)** | 0.015 max | | **Other Elements** | 0.50 max | | | --- #### **2. Physical & Magnetic Properties** **Physical Properties:** | Property | Metric Units | Imperial Units | |----------|-----------------|------| | **Density** | 8.70 g/cm³ | 0.314 lb/in³ | | **Melting Point** | 1425 °C | 2597 °F | | **Thermal Conductivity** | 17.0 W/m·K | 118 Btu·in/hr·ft²·°F | | **Coefficient of Thermal Expansion** | 11.5 μm/m·°C | 6.4 μin/in·°F | | **Specific Heat** | 460 J/kg·K | 0.110 Btu/lb·°F | | **Electrical Resistivity** | 0.55 μΩ·m | 330 Ω·cir mil/ft | | **Modulus of Elasticity** | 145 GPa | 21.0 x 10⁶ psi | **Magnetic Properties (Annealed Condition):** | Property | Value | |----------|-----------------| | **Initial Permeability** | 30,000 - 50,000 μ | | **Maximum Permeability** | 100,000 - 200,000 μ | | **Saturation Induction** | 0.75 - 0.85 T | 7.5 - 8.5 kG | | **Coercive Force** | 0.8 - 1.5 A/m | 0.01 - 0.02 Oe | | **Residual Induction** | 0.30 - 0.45 T | 3.0 - 4.5 kG | | **Hysteresis Loss** | 20 - 40 J/m³/cycle | --- #### **3. Key Characteristics & Product Applications** **Key Characteristics:** - **Exceptional Magnetic Permeability**: Ultra-high initial and maximum permeability values - **Low Core Losses**: Minimal hysteresis and eddy current losses - **High Saturation Induction**: Excellent magnetic flux carrying capacity - **Low Coercive Force**: Easy magnetization and demagnetization characteristics - **Good Mechanical Properties**: Adequate strength for component fabrication - **Controlled Magnetostriction**: Minimal dimensional changes during magnetization **Product Applications:** HyMu "80" alloy serves critical functions in precision electronic applications: - **Aerospace & Defense Electronics**: - Precision transformers and inductors - Magnetic amplifier cores - Radar system components - Navigation instrument cores - **Telecommunications**: - Telephone relay cores - Communication transformer laminations - Signal processing components - High-frequency magnetic devices - **Instrumentation & Control**: - Precision current transformers - Magnetic shielding applications - Sensor core materials - Instrument transformer cores - **Medical Electronics**: - MRI system components - Medical imaging equipment - Diagnostic instrument cores - Biomedical sensors --- #### **4. International Standards & Specifications** HyMu "80" alloy complies with the following international standards: **Primary Specifications:** - **MIL-N-14411 B (MR)**: Military Specification - Magnetic Cores, Laminations, for Electronic Applications - **ASTM A-753-78**: Standard Specification for Nickel-Iron Soft Magnetic Alloys **Related Standards:** - **UNS**: K94840 (Similar alloy classification) - **AMS**: 7720 (Aerospace Material Specification) - **IEC 60404-8-6**: Magnetic materials - Specifications for individual materials - **IEEE 393**: Standard for Test Procedures for Magnetic Cores --- #### **Summary of Key Advantages** - **Superior Magnetic Performance**: Exceptional permeability with minimal core losses - **Proven Reliability**: Extensive service history in critical electronic applications - **Excellent Fabricability**: Suitable for stamping, punching, and forming operations - **Consistent Quality**: Reproducible magnetic properties per military specifications - **Wide Application Range**: Suitable for various electronic and electrical applications - **Comprehensive Certification**: Meets military and international quality standards **Technical Note**: HyMu "80" alloy requires specific heat treatment in hydrogen or vacuum atmosphere to achieve optimal magnetic properties. The recommended annealing cycle involves heating to 1100-1150°C (2010-2100°F) in dry hydrogen with a dew point below -40°C (-40°F), followed by controlled cooling at 100-200°C per hour (180-360°F per hour) through the critical temperature range. The alloy exhibits excellent response to cold working and can be effectively formed into complex shapes. For best magnetic performance, stress relief annealing is recommended after severe forming operations. The material demonstrates particularly low hysteresis loss and excellent permeability at low field strengths, making it ideal for sensitive electronic applications. Proper handling and storage in clean, dry conditions are essential to prevent surface contamination that could affect magnetic performance.

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 3181 gallon liquid totes Special package is available on request.