Introduction

     7075 aluminum plate belongs to the Al-Zn-Mg-Cu super-duralumin, 7075 alloy is an ultra-high-strength deformed aluminum alloy that has been used in the aircraft industry in the late 1940s and is still widely used in the aviation industry. It is characterized by good plasticity after solution treatment, particularly good heat treatment strengthening effect, high strength below 150℃, and particularly good low temperature strength; poor welding performance; stress corrosion cracking tendency; aluminum or other Protection processing use. Two-stage aging can improve the alloy's ability to resist stress corrosion cracking. The plasticity in the annealed and just-quenched state is slightly lower than 2A12 in the same state. It is slightly better than 7A04. The static fatigue of the sheet is sensitive to notches, and the stress corrosion performance is better than 7A04. Among them, the 7075-T651 state is especially the top grade and is known as aluminum. The most excellent product among alloys has high strength, far better than mild steel. This alloy has good mechanical properties and anode reaction, and is a typical aerospace and military special aluminum alloy material.

Typical use

     Used to manufacture aircraft structures and other high-stress structural parts that require high strength and strong corrosion resistance, such as aircraft upper and lower wing panels, stringers, bulkheads, etc. After solution treatment, the plasticity is good, and the heat treatment strengthening effect is particularly good. It has high strength below 150℃, and has particularly good low temperature strength, poor welding performance, and stress corrosion cracking tendency. Two-stage aging can improve SCC resistance.

Features

     7075 is an aluminum alloy with zinc as the main alloying element, but sometimes a small amount of magnesium and copper are added. Among them, the super-hard aluminum alloy contains zinc, lead, magnesium and copper alloys, which are close to the hardness of steel. It can be strengthened by heat treatment. It is a high-strength, heat-treatable alloy with ordinary corrosion resistance and good mechanical properties. Aluminum 7075 is a cold-treated forging alloy with high strength, far better than mild steel. 7075 aluminum alloy is one of the most powerful alloys commercially available. Common corrosion resistance, good mechanical properties and anode reaction. The small grains make the deep drilling performance better, the tool wear resistance is enhanced, and the thread rolling is more different.

Heat treatment

     Zinc is the main alloying element in 7075. Adding magnesium to an alloy containing 3%-7.5% zinc can form MgZn2 with a significant strengthening effect, making the alloy's heat treatment effect far better than aluminum-zinc binary alloys.

     Increasing the content of zinc and magnesium in the alloy will further improve the tensile strength, but its resistance to stress corrosion and spalling corrosion will decrease.

     After heat treatment, it can reach very high strength characteristics. 7075 materials are generally added with a small amount of copper, chromium and other alloys. Among the series, 7075T651 aluminum alloy is particularly top-grade, and it is known as the best product among aluminum alloys, with high strength and far better than any mild steel.

chemical composition

Si：0.40

Fe: 0.50

Cu：1.2-2.0

Mn：0.30

Mg：2.1-2.9

Cr：0.18-0.28

Zn：5.1-6.1

Ti：0.20

Al：other

Single：0.05

All：0.15

Mechanical properties