Nickel 75/Manganese 25 Alloy,Nickel Manganese Alloy.Ni25Mn Alloy，1

### **Nickel 75/Manganese 25 Alloy (Ni₇₅Mn₂₅) - Shape Memory and Magnetocaloric Alloy** #### **Overview** **Nickel 75/Manganese 25 Alloy** is a unique nickel-manganese intermetallic compound that exhibits remarkable functional properties, including shape memory effects, magnetocaloric behavior, and magnetic shape memory characteristics. This near-equiatomic alloy undergoes a reversible martensitic transformation that can be triggered by both temperature changes and magnetic fields, making it a promising material for advanced smart applications in actuators, sensors, and solid-state refrigeration technologies. --- #### **Chemical Composition (Atomic % / Weight %)** | Element | Atomic % | Weight % (Approx.) | |---------|-------------|-----------| | **Nickel (Ni)** | **73.0-77.0%** | **~71.0-75.0%** | | **Manganese (Mn)** | **23.0-27.0%** | **~25.0-29.0%** | | **Iron (Fe)** | **≤ 0.5%** | Controlled impurity | | **Cobalt (Co)** | **0-5.0%** | Optional addition for property modification | | **Copper (Cu)** | **≤ 0.1%** | Controlled impurity | | **Carbon (C)** | **≤ 0.05%** | Strictly controlled | | **Silicon (Si)** | **≤ 0.1%** | Controlled impurity | --- #### **Physical & Mechanical Properties** | Property | Value / Description | |----------|---------------------| | **Density** | **7.85 g/cm³** | | **Melting Point** | **~1050-1150°C** (1922-2102°F) | | **Crystal Structure** | Cubic L1₀ (martensite) / Cubic B2 (austenite) | | **Electrical Resistivity** | **80-120 μΩ·cm** | | **Thermal Conductivity** | **10-15 W/m·K** (at 20°C) | | **Coefficient of Thermal Expansion** | **12.0-16.0 × 10⁻⁶/°C** (phase-dependent) | | **Specific Heat Capacity** | **450-500 J/kg·K** | | **Young's Modulus** | **60-80 GPa** (phase-dependent) | | **Tensile Strength** | **400-800 MPa** | | **Yield Strength** | **200-500 MPa** | | **Elongation** | **5-15%** | | **Hardness** | **200-300 HV** | --- #### **Functional Properties** | Property | Value / Description | |----------|---------------------| | **Transformation Temperature** | **-50°C to +200°C** (adjustable via composition) | | **Transformation Hysteresis** | **10-30°C** | | **Recoverable Strain** | **Up to 6%** (magnetic field induced) | | **Magnetic Transition** | **Martensitic transformation coupled with magnetic ordering** | | **Curie Temperature** | **Variable with composition** | | **Magnetocaloric Effect** | **Significant near transformation temperature** | --- #### **Key Characteristics & Applications** **Key Characteristics:** - **Magnetic Shape Memory Effect**: Large deformations induced by magnetic fields - **Magnetocaloric Properties**: Significant temperature changes under magnetic fields - **Two-Way Shape Memory**: Reversible transformation between phases - **High Responsiveness**: Fast actuation under magnetic stimulation - **Tunable Transformation**: Temperature adjustable through composition - **Good Work Output**: Substantial force generation during transformation **Typical Applications:** - **Solid-State Refrigeration**: Magnetic refrigeration systems, efficient cooling devices - **Precision Actuators**: Micro-positioning systems, robotic components - **Sensors**: Magnetic field sensors, temperature sensors - **Energy Harvesting**: Vibration energy conversion devices - **Medical Devices**: Miniature surgical tools, implantable devices - **Aerospace**: Adaptive structures, deployment mechanisms - **Automotive**: Smart valves, active vibration control --- #### **International Standards & Specifications** | Standard | Designation | Description | |----------|-------------|-------------| | **ASTM** | **F2004** | Test method for transformation temperature | | **ASTM** | **F2082** | Test method for determination of transformation temperature | | **ISO** | **Under Development** | Emerging standards for magnetic shape memory alloys | | **Research Standards** | **Laboratory Protocols** | Academic and research institution specifications | *Note: As an emerging advanced material, Ni₇₅Mn₂₅ is primarily covered by research protocols rather than established commercial standards.* --- #### **Manufacturing & Processing** **Available Forms:** - **Ingots**: Arc-melted or induction-melted buttons - **Ribbons**: Melt-spun amorphous/nanocrystalline forms - **Thin Films**: Sputtered or evaporated layers - **Polycrystalline Rods**: Directionally solidified materials - **Powders**: For composite materials **Processing Considerations:** - **Homogenization**: 800-1000°C for 24-72 hours required - **Heat Treatment**: Critical for setting transformation characteristics - **Thermomechanical Processing**: Improves functional properties - **Single Crystal Growth**: Challenging but possible via Bridgman method --- #### **Quality Control & Testing** - **Transformation Analysis**: DSC for thermal transformation characterization - **Magnetic Characterization**: VSM for magnetic properties - **Structural Analysis**: XRD for phase identification - **Microstructural Examination**: SEM/TEM for phase distribution - **Functional Testing**: Actuation cycles, fatigue performance - **Calorimetric Measurements**: Magnetocaloric effect quantification --- #### **Comparison with Related Shape Memory Alloys** | Property | Ni₇₅Mn₂₅ | NiTi (Nitinol) | Cu-Al-Ni | |----------|-----------|----------------|-----------| | **Actuation Mechanism** | Magnetic/Thermal | Thermal/Stress | Thermal/Stress | | **Maximum Strain** | ~6% | ~8% | ~4% | | **Response Speed** | Very Fast (ms) | Moderate | Moderate | | **Work Output** | High | Very High | Medium | | **Fatigue Life** | Under Study | Excellent | Fair | --- #### **Summary** **Nickel 75/Manganese 25 Alloy** represents a cutting-edge functional material at the forefront of smart materials research. Its unique combination of magnetic and thermal shape memory effects opens new possibilities for solid-state actuation and refrigeration technologies. While still primarily in the research and development phase, this alloy shows tremendous promise for applications requiring fast, contactless actuation and efficient energy conversion. The ongoing research focuses on improving cyclic stability, increasing transformation temperatures, and developing reliable manufacturing processes. As understanding of this material system deepens and manufacturing challenges are overcome, Ni₇₅Mn₂₅ is poised to enable innovative solutions in areas ranging from precision engineering to sustainable energy technologies.

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 3228 gallon liquid totes Special package is available on request.