7075 T351 VS T4

 7075 aluminum plate belongs to the Al-Zn-Mg-Cu series of super-hard aluminum. It has been used in the aircraft manufacturing industry since the late 1940s and still occupies an important position in the aviation industry and other fields.

7075 T351

Performance Characteristics

High Strength and Good Toughness: AA7075 t7351 has high strength, with tensile strength typically reaching a certain level, meeting numerous strength-demanding applications. It also possesses excellent toughness, resisting brittle fracture when subjected to significant external impact, maintaining structural integrity.

Excellent Machinability: This aluminum alloy exhibits excellent machinability. Both cold and hot working processes can be performed smoothly. For example, during machining, it can be precisely machined into various complex shapes through turning, milling, and drilling, resulting in excellent surface quality. This is due to its uniform microstructure and moderate hardness.

Excellent Corrosion Resistance: 7075 T351 exhibits excellent corrosion resistance under normal conditions. The combination of its alloying elements and heat treatment process allows it to form a dense oxide film on its surface. This film effectively blocks the intrusion of corrosive media, protecting the metal within and extending the service life of components.

Stress relief properties: The T351 state means that the material has been pre-stretched to eliminate internal stress. This greatly improves the dimensional stability of the material during subsequent use, and it is not easy to deform due to the release of internal stress, which is crucial for some applications that require extremely high dimensional accuracy.

Application fields

Aerospace field: In aerospace fixtures, 7075 T351 aluminum alloy is widely used. Many parts of aircraft, such as wing structures and fuselage frames, are made of 7075 T351 aluminum alloy. These parts need to have high strength to withstand various complex stresses during flight, and good toughness can prevent brittle failure in harsh environments such as high altitude and low temperature. Its excellent processing performance can meet the processing requirements of complex shapes of aviation parts, and the stress relief characteristics ensure the dimensional stability of parts during long-term use, ensuring flight safety.

High-end machinery manufacturing: In the manufacturing of high-end machinery and equipment, such as key parts of precision machine tools and structural parts of industrial robots, 7075 T351 aluminum alloy is also often used. Machine tool components require high precision and stability, and the performance of 7075 T351 aluminum alloy precisely meets these requirements, ensuring that machine tools maintain accuracy during high-speed operation and long processing times. Industrial robot structural components must maintain sufficient strength while minimizing weight to enhance mobility and energy efficiency. The high strength and relatively light weight of 7075 T351 aluminum alloy make it an ideal choice.

7075 T4 aluminum

Performance characteristics

High strength and good plasticity: The aluminum alloy in the 7075 T4 temper has high strength. Although the strength value may be slightly different from that of T351, it can still meet the strength requirements of many engineering applications. At the same time, it has good plasticity after solution treatment, which allows the material to be processed into various complex shapes through forging, extrusion, stretching and other processes during the forming process, and it is not easy to have defects such as cracks during the processing.

Good mechanical properties: The aluminum alloy in this state has good comprehensive mechanical properties. In addition to strength and plasticity, its hardness, wear resistance and other properties are also excellent. In some application scenarios that need to withstand friction and wear, the 7075 T4 aluminum alloy can rely on its good wear resistance to ensure the long-term stable operation of parts.

Ordinary corrosion resistance: The 7075 T4 aluminum alloy has ordinary corrosion resistance and can resist a certain degree of corrosion in general atmospheric environments and conventional industrial environments. However, compared with T351, its corrosion resistance may be slightly inferior, but its corrosion resistance can be further improved through appropriate surface treatment, such as anodizing.

Application fields

Automobile manufacturing: In the automotive industry, 7075 T4 aluminum alloy is often used to manufacture some key parts of automobiles, such as automobile wheels, engine parts, etc. Automobile wheels need to have a certain strength and good plasticity to ensure that they will not break when bearing the weight of the vehicle and various impact forces during driving. At the same time, good plasticity is conducive to the forging and forming of the wheel.

Engine parts, such as pistons and connecting rods, have high requirements for material strength, wear resistance and lightness. 7075 T4 aluminum alloy can reduce the weight of the engine and improve the fuel economy of the car while meeting the strength and wear resistance.

Sports goods manufacturing: In the field of sports goods, 7075 T4 aluminum alloy is also widely used. For example, golf club shafts, bicycle frames and other products are often made of 7075 T4 aluminum alloy. Golf club shafts require high strength and good elasticity, and 7075 T4 aluminum alloy meets these requirements, allowing the club to produce appropriate elastic deformation when hitting the ball, improving the impact. Bicycle frames, on the other hand, need to be as light as possible while maintaining strength. The performance characteristics of 7075 T4 aluminum alloy enable the manufacture of strong yet lightweight bicycle frames, improving riding comfort and speed.

Original Source:https://www.aircraftaluminium.com/a/7075-t351-vs-t4.html

The Application of 7075 Aluminum Sheet in Automobile

 In recent years, with the rapid development of lightweight transportation and new energy, the industrial aluminum market, which is highly related to it, has become the main growth driver of the current domestic aluminum consumption market. Among the many industrial aluminum materials, 7075 aluminum sheet is particularly concerned.

7075 aluminium alloy belongs to Al-Zn-Mg-Cu series aluminum alloy, which is a cold-treated forging alloy. It is famous for its high strength and high hardness, which is far superior to low carbon steel. At the same time, the 7075 aluminum plate is also a heat-treatable alloy, which also has good corrosion resistance, high toughness and excellent processing performance.

These excellent properties make 7075 aluminum alloy widely used in aerospace and related fields, especially for the manufacture of aircraft structures and other high-stress structures that require high strength and corrosion resistance, such as the front fuselage of the C919 aircraft passenger observation window frame, mid-fuselage truss, keel beam edge, keel beam web, floor turning beam, middle and rear fuselage girder and cargo door frame, nose girder,etc.

With its high performance and practicability, the applications of 7075 aluminum have gradually extended from the traditional aerospace and military fields to mechanical equipment, mold processing, automobiles and even consumer electronics. 7075 is widely used in automobile bumpers, support swing arm forgings, engine rocker arms, body structural parts, etc.

7075 alloy was first developed by Alcoa for World War II aircraft and was formally finalized in 1944, mainly for the manufacture of large bombers and fighter jets. Due to the high technical threshold and the late start of the domestic aluminum industry, domestic "aviation aluminum" mainly relied on imports for a long time. However, with the gradual expansion of domestic aluminum consumption and the rapid development of China's aluminum industry in recent years, this situation It has been gradually improved.

The 7075 aluminum sheet produced by Haomei Aluminum has become one of the mainstream products in the domestic "aviation aluminum" consumer market. It has been used in aerospace, new energy vehicles, 3C and pan-semiconductor. Welcome to leave message below to inquire 7075 aluminum cost.

Original Source:https://www.autoaluminumsheet.com/a/the-application-of-7075-aluminum-sheet-in-automobile.html

Why Is Duralumin Used in Aircraft?

 "Large aircraft" generally refers to transport aircraft with a total take-off weight exceeding 100 t, including military and civilian large transport aircraft, as well as trunk airliners with more than 150 seats. Aluminum alloys have low density, high specific strength, strong corrosion resistance, and easy thermal conductivity. It has a series of advantages such as good plasticity and processing performance, low cost, etc., and has always been the main material for the structure of large aircraft in aviation.

The traditional aluminum alloys for large aircraft structures are mainly high-strength 2000 series((2024, 2224, 2324, 2424, 2524, etc.) and ultra-high-strength 7000 series(matweb aluminum 7075, 7475, 7050, 7150, 7055 , 7085, etc.) After the 1980s, although there was aluminum lithium alloy, rapid solidification aluminum alloy, composite materials, the traditional 2000 and 7000 aluminum alloys still show strong vitality.

7075 aluminum alloy is a high-strength, heat-treatable wrought alloy developed by Alcoa in 1943. The alloy contains zinc, magnesium, chromium and copper as hardeners, as well as small amounts of iron, silicon, manganese and titanium. Al-7075 is much stronger than carbon steel after heat treatment. The common tempers are 7075-T6, T651, T7351, T73, T76, T7651, O, W, W51, etc.

The success of the 7150-T77 aluminum not only meets the requirements of corrosion performance, but also does not sacrifice the strength of the alloy. Later, by adjusting the alloy composition, reducing the content of impurity elements such as Fe and Si, and improving the production process, Alcoa developed the 7055-T77 ultra-high strength plate and the 2524-T3 ultra-high fatigue strength plate.

2024 aircraft aluminum alloy is a typical hard aluminum alloy in the aluminum-copper-magnesium system, whose composition is more effective. What are the al 2024 properties? It has high strength and certain temperature resistance, and can be used as a working part below 150 degrees. After heat treatment, the 2024 aluminum alloy has undergone solid solution treatment to obtain relatively high compressive strength and ductility. Because its strength is very high, it is generally used to produce skins, roof beams, bulkheads, and wings by plane.

The fracture toughness and fatigue resistance of 2524-T3 clad aluminum plate are more than 30% higher than that of 2024-T3 clad aluminum plate, and it is considered to be the most ideal aircraft skin material at present. The strength of 7055-T77 alloy is 25% higher than 7075-T651 and 8~12% higher than 7150-T77, while the fracture toughness and stress corrosion resistance are comparable to 7050-T61.

Original Source:https://www.aircraftaluminium.com/a/why-is-duralumin-used-in-aircraft.html

Why Is Aluminum Used for Aircraft Bodies

 Why is aluminum used for aircraft bodies? Aircraft aluminum alloys have many excellent properties such as high toughness, corrosion resistance and fatigue resistance. Since the early 20th century, they have been widely used in the aviation field as the fuselage skin, beams, stringers,etc. According to the difference in the service performance and use of the aircraft, the amount and specifications of aluminum alloys on the aircraft are also quite different.

7xxx aluminum alloy is another commonly used alloy with a wide variety. It contains zinc and magnesium. The most common aluminum alloy with the best strength is 7075 aircraft aluminum. How about aluminum alloy 7075 properties?

7075 aluminum alloy is a cold-worked wrought alloy, one of the strongest commercially available alloys. It has normal corrosion resistance, good mechanical properties and anodic reaction. The finer grains result in better deep drilling performance, enhanced tool wear resistance and distinctive thread rolling.

7075 mainly contains zinc element, which is an aluminum-magnesium-zinc-copper alloy and a heat-treatable alloy. It is a super-hard aluminum alloy and has good wear resistance. The 7075 aluminum plate is stress relieved and will not deform or warp after processing. All super-large and super-thick 7075 aluminum plates are ultrasonically detected, which can ensure no blisters and impurities. 7075 aluminum plate has high thermal conductivity, which can shorten the forming time and improve work efficiency.

After solution treatment, it has good plasticity, good heat treatment strengthening effect, good strength below 150 degrees, and particularly good low temperature strength, poor welding performance, and tendency to stress corrosion cracking.

7075 aluminum plate is generally added with a small amount of copper, chromium and other alloying element. Among this series, the 7075-T651 aluminum alloy is known as the best product in aluminum alloys. This alloy also has good mechanical properties and anodic reaction.

7075 Aluminum Composition

LLOY	TEMPER	DIRECTION	THICKNESS(MM)	TENSILE STRENGTH(MM) RM(MPA)	YIELD STRENGTH RP0.2(MPA)	BREAKING ELONGATION A50%	STANDARD
7075 Thick Plate	T651	LT	6-260	570-590	495-515	10-13.5	GB/T3380
	T7651	LT	6-102	550-560	480-490	10.5-12.5	AMS4045K
	T7351	LT	6-102	500-520	420-435	10-12.5	AMS4078
7075 Thin Plate	T6	-	0.5-3.5	550-570	480-500	11-15	GB/T3880 EN485 ASTM B209

Original Source:https://www.aircraftaluminium.com/a/why-is-aluminum-used-for-aircraft-bodies.html

 

The Common Aircraft Aluminum Alloys

The aircraft aluminum alloy is a kind of high-strength deformed aluminum alloy, which is currently widely used in the aviation industry. It has good mechanical and processing properties, good plasticity after solution treatment, and good heat treatment strengthening effect.

Generally, it has high strength and toughness below 150°C (or even higher), and is an ideal structural material. In addition, aviation aluminum is light in weight and has a significant lightweight effect, which has replaced the steel’s leading position of current aviation materials. Airplane has high requirements for aluminum, which is an important high-end application market for aluminum alloy.

Aircraft aluminum sheet is the main structural material for the manufacturing of large aircraft due to its high specific strength, good forming and processing properties. It can be used for the those pars like wing skin, wing girders, upper and lower edge bars of wing spars, webs, fuselage girders, seat slides, keel beams, side frames, fuselage skins, lower fuselage panels, main floor stringer,etc.

For example, the aluminum alloy used in A380-800 Airbus accounts for the largest proportion, reaching 61%, that in A350-900XWB Airbus accounts for 20%, and Boeing 787-8 Airbus accounts for 15%-20%.

The aluminum alloys used in large aircraft structures worldwide are mainly high-strength 2xxx aluminum(2224, 2324, 2424, 2524 2024 aluminum alloy) and high strength 7xxx aluminum(7475, 7050, 7150, 7055, 7085, 7075 aluminum sheet).

2xxx aluminum belongs to the Al-Cu-Mg series alloy, which is called high-strength duralumin, and is the most widely used structural aluminum alloy. The tensile strength of 2xxx aluminum is 400~500 MPa, which is lower than the room temperature strength of 7xxx alloy, but its heat resistance, fatigue characteristics, especially fatigue crack growth resistance are all higher than 7xxx aluminum.

7xxx aluminumalloy belongs to the Al-Zn-Mg-Cu series alloy. This type of alloy has high specific strength and hardness, good corrosion resistance, high toughness, and excellent processing performance. Welcome to leave message below to inquire what you need.

Original Source:https://www.aircraftaluminium.com/a/the-common-aircraft-aluminum-alloys.html