A kind of 2 series aluminum alloy heat treatment process

Abstract

The invention belongs to the field of aluminum alloy preparation, and relates to a 2-series aluminum alloy heat treatment process, comprising the following steps: the aluminum alloy is formulated according to the following mass percentages: Cu: 4.55‑4.65, Si: ≤0.25, Mg: 1.55‑1.65, Zn≤ 0.20, Mn: 0.50‑0.70, Ti≤0.12, Ni≤0.10, Fe≤0.35, Fe+Ni≤0.35, and the balance is Al; Melt the configured aluminum alloy, remove gas and slag thoroughly, and cast out the composition , qualified aluminum alloy ingots; extrude the aluminum alloy ingots with an extrusion ratio of 9 / 1 to obtain aluminum alloy profiles; carry out graded solid solution for the aluminum alloy profiles, and the first level of solid solution is free to heat up to 460 ℃ heat preservation for 1.5h, the second stage solid solution raises the temperature to 505°C and heat preservation for 1h, and then quenches after solid solution; the quenched aluminum alloy profiles are subjected to pre-aging treatment, then regression treatment, and finally re-aging treatment , the present invention adopts two-stage solid solution and regressive reaging treatment, which improves the mechanical properties of the alloy and improves the corrosion resistance of the alloy at the same time.

Description

technical field [0001] The invention belongs to the field of aluminum alloy preparation and relates to a 2-series aluminum alloy heat treatment process. Background technique [0002] The 2-series aluminum alloy has high strength, good forgeability, and good heat resistance, so it is widely used in aerospace and other fields. After the alloy is treated by solution quenching, aging and other processes, it can obtain better working performance. As one of the key links in the heat treatment process, solid solution directly affects the microstructure change, recrystallization, and solid solution degree of strengthening elements of the alloy, thereby affecting the final mechanical properties of the alloy. With the urgent demand for higher-performance 2-series aluminum alloys in my country's aerospace industry, the conventional solution heat treatment used at this stage can no longer meet the current production requirements. At present, fracture toughness has become the four main...

AI Technical Summary

Problems solved by technology

There are many aging treatment systems for 2-series aluminum alloys. Among them, peak aging can make the alloy obtain higher strength, but its corrosion resistance and fracture toughness are poor; overaging (T74) can improve the corrosion resistance and fracture toughness of the alloy, but at the expense of strength