Aluminium / Aluminum 1145 Alloy (UNS A91145)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
     Machinability
     Forming
     Welding
     Heat Treatment
     Cold Working
     Annealing
     Hardening

Introduction

Aluminium / Aluminum alloys are known for their strong corrosion resistance. They are sensitive to high temperatures in the range of 200 to 250°C (392 to 482°F). High temperatures tend to reduce these alloys’ strength. However, the strength of the aluminum alloys can be increased at subzero temperatures, making them good low-temperature alloys.

The following datasheet provides details about Aluminium / Aluminum 1145 alloy.

Chemical Composition

The following table shows the chemical composition of Aluminium / Aluminum 1145 alloy.

Element Content (%)
Aluminum, Al 99.45 (min)
Copper, Cu
0.05
Manganese, Mn
0.05
Magnesium, Mg
0.05
Zinc, Zn
0.05
Titanium, Ti
0.03
Silicon, Si + Iron, Fe
Remainder

Physical Properties

The physical properties of the aluminum 1145 alloy are outlined in the following table.

Properties Metric Imperial
Density 2.6-2.8 g/cm3 0.0939-0.1011 lb/in3

Mechanical Properties

The mechanical properties of the aluminum 1145 alloy are tabulated below.

Properties Metric Imperial
Elastic modulus 70-80 GPa 10152-11603 ksi
Poisson’s ratio 0.33 0.33

Thermal Properties

The thermal properties of Aluminium / Aluminum 1145 alloy are tabulated below.

Properties Conditions
T (ºC) Treatment
Thermal conductivity 227 W/mK 25 H18

Other Designations

Equivalent materials to the Aluminium / Aluminum 1145 alloy are as follows:

  • AMS 4011
  • ASTM B373
  • ASTM B479
  • QQ A-1876

Fabrication and Heat Treatment

Machinability

Aluminium / Aluminum 1145 alloy is a difficult alloy to machine. It is slightly easier to machine in the H16, 18 or 19 tempers than in the softer or annealed temper form.

Forming

Aluminium / Aluminum 1145 alloy has excellent forming quality and can be easily formed using all the conventional forming methods.

Welding

Weldability of the Aluminium / Aluminum 1145 alloy is excellent when commercial methods such as TIG or MIG welding are used.

Heat Treatment

Aluminium / Aluminum 1145 alloy is a non-heat treatable alloy that can be hardened by cold working.

Cold Working

Aluminium / Aluminum 1145 alloy is extremely easy to cold work in the softer tempers such as annealed, H12, 14, 16 tempers. It is a lot more difficult with harder tempers but it is still possible.

Annealing

Annealing can be performed at 343°C (650°F) for a suitable amount of time and then air cooled.

Hardening

Aluminium / Aluminum 1145 alloy can be hardened by cold working only.

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