Aluminum alloy properties, the mechanical and physical characteristics of the alloy, experience change when exposed to elevated (max. 400°C) and extremely low (cryogenic, -195°C) temperatures. These temperature-related changes are not as obvious as they are with steel and other metals. Additionally, the types of changes evidenced by aluminum alloys due to extreme temperatures are greatly influenced by the actual temper and chemical composition of the metal.
The best room-temperature tensile properties are found in aluminum alloy investment casting ingots of the 7xxx-series alloys. Unfortunately, exposure to high temperatures causes that strength to rapidly weaken due to the fin precipitates coarsening. And while series 2xxx aluminum alloys do well at elevated temperatures, they’re not usually employed in such applications. Continue...
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