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powder metallurgy of superalloys

The science of powder metallurgy of superalloys is concerned with the formation of powders of various metals. It describes the processes used to prepare these metals, as well as their properties and applications in high-temperature applications.


Hot forging, sintering, and extrusion are common processes in superalloy powder metallurgy. These processes are used to create high-performance components as well as a wide range of other products.

Compaction is the first step in powder metallurgy processing. In a screened container, the material is mixed and heated to just below the melting point. This allows the powder particles to fuse without melting.

The material is then ejected through small orifices. As a result, the minimum size of powder grains is only 10 mm. The powder can be thermomechanically processed to achieve a large controlled grain size, depending on the material.

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Proper HIPping temperatures

Superalloys are among the various alloys utilized in today's jet turbine engines because they can operate at greater temperatures. g-TiAl alloys, in particular, have been employed for low-pressure turbine blades. Furthermore, powder metallurgy has been used to enhance the metallurgical characteristics of superalloys. The use of a single crystal to strengthen high-temperature turbine blades has also been studied.

For almost 75 years, scientists have been studying superalloys. Recent research initiatives, however, have taken metallurgy to a new level by investigating the development of atomic scale dynamic complexions. Alloys with intermediate Re content are among the most recent advancements. CMSX-4 Plus, for example, includes 4.8 wt.% Re and provides a threefold increase in creep strength over regular LSHR. The same is true for SCA425, which was created in collaboration with Berlin's Hahn-Meitner-Institut.

Material composition

Superalloys are typically alloyed with elements that have high corrosion and oxidation resistance, allowing them to remain stable at high temperatures. Superalloys also have a high tensile strength and ductility. They're commonly found in aerospace components like aircraft turbine engines. However, their manufacturing process is complicated. They require unique materials and techniques to manufacture. They can also be difficult to cut. The properties of the finished part should drive material selection.

To meet specific performance requirements, a novel powder metallurgy superalloy was developed. It is made up of 10% nickel, 2.22.8% molybdenum, 2.83.4% aluminum, and 0.30.7% titanium. Electron metallography, optical metallography, and microstructural analysis were used to characterize the alloy's mechanical properties. On specimens and extruded billets, the alloy's strength and ductility were measured. Mechanical performance was measured at 550 and 830 degrees Celsius. After aging, the product demonstrated high ductility and strength.

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