7178
UNS A97178 / AlZn7MgCu / 7178 / T651
| Chemical Properties | % Value |
| Silicon (Si) | 0,00 - 0,40 |
| Chromium (Cr) | 0,18 - 0,28 |
| Manganese (Mn) | 0,00 - 0,30 |
| Magnesium (Mg) | 2,40 - 3,10 |
| Copper (Cu) | 1,60 - 2,40 |
| Titanium (Ti) | 0,00 - 0,20 |
| Iron (Fe) | 0,00 - 0,50 |
| Zinc (Zn) | 6,30 - 7,30 |
| Aluminium (Al) | Balance |
| Physical Properties | Value |
| Density | 2,83 g/cm³ |
| Melting Point | 477 °C |
| Thermal Expansion | 23.5 µm/m°C |
| Modulus of Elasticity | 71 GPa |
| Thermal Conductivity | 130 W/m.K |
| Electrical Resistivity | 31% IACS |
| Mechanical Properties | Value |
| Proof Strength | 550 MPa |
| Yield Strength | 630 MPa |
| Shear Strength | 370 MPa |
| Elongation A50 mm | 8% |
| Hardness | 150 HB |
The 7178 T651 aluminum alloy is known for its exceptional strength, excellent machinability, and good corrosion resistance. The T651 temper represents a heat-treated version of the alloy, providing it with enhanced durability and hardness. These characteristics make 7178 T651 ideal for use in demanding applications, particularly in the aerospace, defense, and automotive industries, where high-performance and strength are crucial. Additionally, 7178 T651 aluminum is suitable for anodizing, which improves its surface appearance and increases corrosion resistance, making it suitable for outdoor and marine applications.
In terms of weldability, 7178 T651 aluminum alloy can be welded, but due to its high strength, it requires careful handling during the welding process. Proper welding techniques and heat treatment are essential to achieve strong and reliable welds. Regarding bending, 7178 T651 is more difficult to bend compared to softer alloys due to its high strength and hardness. However, with the right equipment and techniques, it can still be shaped for use in structural applications.
The corrosion resistance of 7178 T651 is excellent, particularly in atmospheric conditions and environments like seawater, making it an ideal choice for use in marine applications and outdoor structures. Additionally, 7178 T651 aluminum alloy performs well in high-vibration environments, making it advantageous for industries like automotive, aerospace, and defense, where components are subjected to dynamic stress. Its durability and long-lasting performance enhance its reliability in these demanding industries.
The advantages of 7178 T651 aluminum alloy include its high mechanical strength, excellent corrosion resistance, anodizing compatibility, and suitability for high-vibration environments. However, its high hardness presents challenges in bending and welding, requiring specialized techniques. Additionally, this alloy may be harder to machine compared to more flexible alloys. Despite these challenges, 7178 T651 is an excellent choice for applications requiring both strength and durability in demanding environments.
As Sheet/Plate; 7178 T651, ASTM B209, AMS QQ-A-250/14, UNS A 97178, ISO AlZn7MgCu
Choosing Factors for 7178 T651
- Strength: High
- Machining: Low
- Weldability: Satisfactory
- Formability: Good
- Corrosion Resistance: Good
- Heat Treating: Yes
Some Well-Known Applications for 7178 T651
In the automotive industry and construction sector,
Car body parts and aircraft body parts,
Mostly used in the aerospace sector.
- Plate
- Sheet
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