7178 aluminium alloy

Wrought aluminium zinc alloy

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]

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, Al	88.1
Zinc, Zn	6.8
Magnesium, Mg	2.7
Copper, Cu	2.0
Chromium, Cr	0.26

Properties

Properties	Metric
Density^[1]	2.82 g/cm3
Melting point^[1]	482 °C
Elastic modulus^[1]	70-80 GPa
Poisson's ratio	0.33
Thermal expansion	23.4 (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]

ASTM B209
ASTM B221
ASTM B241
ASTM B316
QQ A-200/13
QQ A-200/14
QQ A-250/14
QQ A-250/21
QQ A-250/28
QQ A-430
SAE J454

Applications

Aircraft components^[1]
Petroleum refineries^[5]
Boilers^[5]
Heat exchangers^[5]
Condensers^[5]
Pipelines^[5]
Cooling towers^[5]
Steam exhausts^[5]
Electric generation plants^[5]

References

^ ^a ^b ^c ^d ^e ^f ^g ^h "7178 aluminum alloy". 31 August 2012.
^ "Annealing effect on 7178 aluminum alloys". Archived from the original on 2016-08-17.
^ "Resistance welding in 7178 alloy". Archived from the original on 2006-03-13.
^ ^a ^b "7178 aluminum alloy properties". Archived from the original on 2004-05-21.
^ ^a ^b ^c ^d ^e ^f ^g ^h "Aluminum 7178 applications". Archived from the original on 2021-01-08.

External links

https://www.makeitfrom.com/material-properties/7178-T6-Aluminum
https://www.substech.com/dokuwiki/doku.php?id=wrought_aluminum-zinc-magnesium_alloy_7178

Aluminium alloys

Introduction