7178 aluminium alloy

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7178 aluminum alloy is wrought alloy. It has high zinc content. [1] After annealing, aluminum alloy 7178 has high machinability. [2] Resistance welding can be used. [3]

Contents

Chemical composition

The chemical composition of Aluminium / Aluminum 7178 alloy is outlined in the following table. It is difficult to cold work. Forming is hard to use for this alloy. It has high machinability. [1]

Element [1] Content (%)
Aluminium / Aluminum, Al88.1
Zinc, Zn6.8
Magnesium, Mg2.7
Copper, Cu2.0
Chromium, Cr0.26

Properties

PropertiesMetric
Density [1] 2.82 g/cm3
Melting point [1] 482 °C
Elastic modulus [1] 70-80 GPa
Poisson's ratio0.33
Thermal expansion23.4 (10-6/°C)
Ultimate Tensile Strength [4] 607 MPa
Tensile Yield Strength [4] 538 MPa

Designations

Aluminium alloy 7178 alloy can be designated as: [1]

  1. ASTM B209
  2. ASTM B221
  3. ASTM B241
  4. ASTM B316
  5. QQ A-200/13
  6. QQ A-200/14
  7. QQ A-250/14
  8. QQ A-250/21
  9. QQ A-250/28
  10. QQ A-430
  11. SAE J454

Advantages

  1. High corrosion resistance
  2. High tensile strength
  3. Excellent polish
  4. High machine strength
  5. High creep resistance
  6. High temperature strength
  7. High mechanical properties

[5]

Applications

  1. Aircraft components [1]
  2. Petroleum refineries [6]
  3. Boilers [6]
  4. Heat exchangers [6]
  5. Condensers [6]
  6. Pipelines [6]
  7. Cooling towers [6]
  8. Steam exhausts [6]
  9. Electric generation plants [6]

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5086 aluminium alloy is an aluminium–magnesium alloy, primarily alloyed with magnesium. It is not strengthened by heat treatment, instead becoming stronger due to strain hardening, or cold mechanical working of the material.

2014 aluminium alloy (aluminum) is an aluminium-based alloy often used in the aerospace industry.

5005 aluminium alloy is an aluminium–magnesium alloy with good resistance to atmospheric corrosion. It is used in decorative and architectural applications.

1060 aluminium alloy is an aluminium-based alloy in the "commercially pure" wrought family. It is fundamentally very similar to 1050 aluminium alloy, with the difference coming down to 0.1% aluminium by weight. However, while both 1050 and 1060 are covered by the same ISO standard, they are covered by different ASTM standards.

2219 aluminium alloy is an alloy in the wrought aluminium-copper family. It can be heat-treated to produce tempers with higher strength but lower ductility. The aluminium-copper alloys have high strength, but are generally less corrosion resistant and harder to weld than other types of aluminium alloys. To compensate for the lower corrosion resistance, 2219 aluminium can be clad in a commercially pure alloy such as 1050 or painted. This alloy is commonly formed by both extrusion and forging, but is not used in casting.

3102 aluminium alloy is an alloy in the wrought aluminium-manganese family. It is one of the most lightly alloyed grades in the 3000 series, with at least 97.85% aluminium by weight. Like most other aluminium-manganese alloys, 3102 is a general-purpose alloy with moderate strength, good workability, and good corrosion resistance. Being lightly alloyed, it tends on the lower strength and higher corrosion resistance side. It can be cold worked to produce tempers with a higher strength but a lower ductility. It can be formed by rolling, extrusion, and forging. As a wrought alloy, it is not used in casting.

5154 aluminium alloy is an alloy in the wrought aluminium-magnesium family. As an aluminium-magnesium alloy, it combines moderate-to-high strength with excellent weldability. 5154 aluminium is commonly used in welded structures such as pressure vessels and ships. As a wrought alloy, it can be formed by rolling, extrusion, and forging, but not casting. It can be cold worked to produce tempers with a higher strength but a lower ductility. It is generally not clad.

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5456 aluminium–magnesium alloy is an alloy in the wrought aluminium-magnesium family. While it is closely related to 5356 aluminium alloy, it is used in structural applications, like most other aluminium-magnesium alloys, and not as filler for welding. As a wrought alloy, it can be formed by rolling, extrusion, and forging, but not casting. It can be cold worked to produce tempers with a higher strength but a lower ductility. It is susceptible to exfoliation corrosion when held at temperatures above 65 °C (150 °F) for extended periods of time.

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Aluminium–magnesium–silicon alloys (AlMgSi) are aluminium alloys—alloys that are mainly made of aluminium—that contain both magnesium and silicon as the most important alloying elements in terms of quantity. Both together account for less than 2 percent by mass. The content of magnesium is greater than that of silicon, otherwise they belong to the aluminum–silicon–magnesium alloys (AlSiMg).

References

  1. 1 2 3 4 5 6 7 8 "7178 aluminum alloy". 31 August 2012.
  2. "Annealing effect on 7178 aluminum alloys". Archived from the original on 2016-08-17.
  3. "Resistance welding in 7178 alloy". Archived from the original on 2006-03-13.
  4. 1 2 "7178 aluminum alloy properties". Archived from the original on 2004-05-21.
  5. "Advantage of 7178 alloy". Archived from the original on 2019-04-07.
  6. 1 2 3 4 5 6 7 8 "Aluminum 7178 applications". Archived from the original on 2021-01-08.