Nov 14 2012
Topics Covered
IntroductionPhysical PropertiesOther DesignationsFabrication and Heat Treatment Machinability Forming Welding Forging Cold Working AnnealingApplications
Introduction
Super alloys are also referred to as high performance alloys. They have the capacity to function under very high temperatures and extreme mechanical stress, and also where high surface stability is required. They have good creep and oxidation resistance.
Super alloys contain many elements in a variety of combinations so as to achieve the desired result. Strengthening of super alloys is performed by solid-solution hardening, work hardening, and precipitation hardening methods.
There are three types of alloys, namely cobalt-base, nickel-base, and iron-base. All of these can be used at temperatures above 540°C (1000°F).
Super alloy AL 52™ is one of the glass-to-metal sealing alloys. It has a coefficient of thermal expansion that is constant up to 565°C (1050°F)
The following datasheet will provide more details about super alloy AL 52™.
Physical Properties
The physical properties of super alloy AL 52™ are outlined in the following table.
| Properties |
Metric |
Imperial |
| Density |
8.30 g/cm³ |
0.3 lb/in³ |
| Melting point |
1427°C |
2600°F |
Other Designations
Equivalent materials to super alloy AL 52™ are provided below:
- ASTM F30-68
- MIL I-23011 Class 2
Fabrication and Heat Treatment
Machinability
Super alloy AL 52™ is similar to austenitic 300 series stainless steels when machined. Cutting oils containing sulfur has to be avoided as it can contaminate the alloy.
Forming
Super alloy AL 52™ can be formed using conventional methods as it has good ductility.
Welding
Super alloy AL 52™ is weldable using all the conventional methods.
Forging
Forging of super alloy AL 52™ should be performed at 1177°C (2150°F).
Cold Working
Super alloy AL 52™ can be easily cold worked.
Annealing
Super alloy AL 52™ can be annealed at 815°C (1500°F) and followed by air cooling. Intermediate strain relief should also be performed at 538°C (1000°F).
Applications
Super alloy AL 52™ is mainly applied in glass-to-metal sealing applications with ceramics and soft glass.