# Alloy 48 UNS K94800: Properties and Applications
## Introduction to Alloy 48 UNS K94800
Alloy 48, also known by its UNS designation K94800, is a nickel-iron alloy with controlled thermal expansion characteristics. This specialized material finds applications in industries where precise dimensional stability across temperature variations is crucial.
## Chemical Composition
The composition of Alloy 48 plays a significant role in its unique properties:
– Nickel: Approximately 48%
– Iron: Balance
– Small amounts of other elements to enhance specific characteristics
This carefully balanced composition gives Alloy 48 its distinctive thermal expansion properties.
## Physical Properties
Alloy 48 exhibits several notable physical properties:
– Density: Approximately 8.25 g/cm³
– Melting Range: 1425-1475°C (2600-2690°F)
– Thermal Expansion: Matches certain glasses and ceramics over specific temperature ranges
– Electrical Resistivity: About 49 μΩ·cm at 20°C
## Mechanical Properties
The mechanical characteristics of Alloy 48 include:
– Tensile Strength: 517-655 MPa (75-95 ksi)
– Yield Strength: 276-414 MPa (40-60 ksi)
– Elongation: 30-45% in 50 mm
– Modulus of Elasticity: Approximately 152 GPa (22 x 10⁶ psi)
## Thermal Expansion Characteristics
One of the most significant features of Alloy 48 is its thermal expansion behavior:
– The alloy exhibits a low and predictable thermal expansion coefficient
– The expansion characteristics can be precisely matched to specific materials
– Maintains dimensional stability across wide temperature ranges
## Applications of Alloy 48
Due to its unique properties, Alloy 48 finds use in various specialized applications:
Keyword: Alloy 48 UNS K94800
### Electronics Industry
– Lead frames for semiconductor packages
– Glass-to-metal seals in electronic components
– Precision measurement devices
### Aerospace Applications
– Instrumentation requiring dimensional stability
– Components for space applications
– Sensors and control systems
### Scientific Equipment
– Precision optical mounts
– Laser components
– Cryogenic applications
## Fabrication and Processing
Alloy 48 can be processed using standard metalworking techniques:
– Machining: Can be machined using standard tools with appropriate parameters
– Welding: Can be welded using conventional methods
– Forming: Can be cold worked and formed with proper techniques
– Heat Treatment: May require specific annealing processes
## Advantages Over Other Materials
Alloy 48 offers several advantages compared to alternative materials:
– Better thermal expansion matching than standard alloys
– Superior dimensional stability
– Good corrosion resistance
– Excellent mechanical properties
## Conclusion
Alloy 48 UNS K94800 serves as a critical material in applications where precise control of thermal expansion is required. Its unique combination of properties makes it indispensable in electronics, aerospace, and scientific instrumentation. As technology advances, the demand for materials with such specialized characteristics continues to grow, ensuring Alloy 48’s ongoing importance in precision engineering applications.
