Whether aluminum alloy can be used in high-temperature environments depends on its specific type and alloy design. The following is a detailed analysis of the application of aluminum alloys in high-temperature environments:
1、 Ordinary aluminum alloy
The performance of ordinary aluminum alloys will decrease in high temperature environments. As the temperature increases, the mechanical strength of aluminum alloy will decrease, plasticity will deteriorate, elongation will also decrease, and cracks and deformation are prone to occur. Therefore, ordinary aluminum alloys are usually not suitable for high-temperature environments, especially when the temperature exceeds their heat resistance limit.
2、 Heat-resistant aluminum alloy
In order to improve the thermal strength of aluminum alloys, various alloy designs and heat treatment processes have been adopted, resulting in the development of heat-resistant aluminum alloys. This alloy can maintain relatively stable mechanical properties in high temperature environments.
Heat resistant elements: Heat resistant aluminum alloys usually contain a certain amount of heat resistant elements, such as nickel, chromium, cobalt, molybdenum, copper, lithium, iron, or rare earth elements. These elements can form stable strengthening phases and improve the high-temperature strength of the alloy.
Main applicable temperature: The main applicable temperature range of heat-resistant aluminum alloy is between 150 ℃ and 300 ℃. Some specially designed heat-resistant aluminum alloys can even maintain high tensile strength and yield strength under high temperature conditions above 300 ℃.
Performance characteristics: In addition to high strength, heat-resistant aluminum alloy also has good toughness and corrosion resistance. Under dynamic loads such as impact and vibration, this alloy can absorb more energy and reduce the risk of brittle fracture. Meanwhile, the dense oxide film formed on its surface can effectively prevent the corrosion medium from damaging the alloy.