Aluminum 4145 Alloy (UNS A94145)

Topics Covered

Chemical Composition
Physical Properties
Other Designations


Aluminium / aluminum is a lightweight silverish white metal, which when combined with one of these elements -manganese, copper, silicon, magnesium, and zinc, forms aluminium / aluminum alloys. Initially, aluminium / aluminum alloys were widely used in aerospace manufacturing; however today it is used in hundreds of components in myriad fields.

Aluminium / aluminum 4145 alloy is a heat treatable wrought alloy type with good corrosion resistance. It is a filler metal, and provides very low susceptibility to weld cracking when used with 2xxx series alloys and with aluminium / aluminum-copper or aluminium/aluminum -copper-silicon castings.

The following datasheet will provide more details about aluminium / aluminum 4145 alloy.

Chemical Composition

The following table shows the chemical composition of aluminium / aluminum 4145 alloy.

Element Content (%)
Aluminum, Al 83 - 87.4
Silicon, Si 9.3 - 10.7
Copper, Cu 3.3 - 4.7
Iron, Fe ≤ 0.80
Zinc, Zn ≤ 0.20
Magnesium, Mg ≤ 0.15
Chromium, Cr ≤ 0.15
Manganese, Mn ≤ 0.15
Beryllium, Be ≤ 0.00080
Remainder (each) ≤ 0.050
Remainder (total) ≤ 0.15

Physical Properties

The physical properties of aluminium / aluminum 4145 alloy are outlined in the following table.

Properties Metric Imperial
Density 2.74 g/cm3 0.0990 lb/in3
Melting point 521-585°C 970-1085°F

Other Designations

Equivalent materials to the aluminium / aluminum 4145 alloy are listed below:

  • ANSI/AWS A5.10 (ER & R)
  • ANSI/AWS A5.8
  • AMS 4184


Aluminium / aluminum 4145 alloy is chiefly used in the following areas:

  • Welding filler wires
  • Brazing wires
  • As a filler metals

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