Aluminum heat treatment is used to increase strength in precipitation-hardening aluminum alloys by controlling solution treatment, quenching, and aging. During solution treatment, alloying elements are dissolved into the aluminum matrix. Quenching retains a supersaturated solid solution, and aging then produces fine precipitates that increase hardness and strength. Mechanical properties depend heavily on alloy chemistry, quench delay, section thickness, and the final temper condition.
In alloys such as 6061, 2024, and 7075, the differences among under-aged, peak-aged, and over-aged conditions can materially affect tensile strength, stress-corrosion behavior, and dimensional stability.
At Braddock, aluminum heat treating is best approached as a temper-control process rather than simply a furnace cycle. The objective is to produce the specified condition – such as T4, T6, T73, or T74 – with consistent response across the load.
This process is commonly used where low weight and relatively high strength are required.
Solution heat treatment temperatures vary by alloy, but many heat-treatable aluminum grades are processed in roughly the 900°F to 1000°F range. Parts are soaked long enough to dissolve the required phases without causing incipient melting at eutectic constituents. After solution treatment, quenching must occur quickly enough to retain a supersaturated structure. Slow transfer or inadequate quench severity can reduce final hardness and strength.
Distortion risk increases with aggressive quenching, so fixture design, part geometry, and quench practice matter. Artificial aging is then performed at a lower temperature to develop the required precipitate structure. Braddock would control solution temperature, transfer time, quench practice, and age cycle because those variables determine the final temperature and property response.
