Aluminium alloys
Mechanical Properties
| Metal | UTS N/mm2 TPSI |
0.2% Proof N/mm2 >TPSI |
Elong % | BH | Density | ||
| LM25M | 130 150 |
8.0 10.0 |
80 100 |
5.0 6.5 |
2.0 3.0 |
55 65 |
2.68 |
| LM25TF | 230 280 |
15.0 18.0 |
200 250 |
13.0 16.0 |
0.0 2.0 |
90 100 |
2.68 |
| LM25TB7 | 160 | 10.0 | 80 110 |
5.0 7.0 |
2.5 | 65 75 |
2.68 |
| 2L99 | 230 | 14.8 | 185 | 12.0 | 2.0 | 80 | 2.68 |
| A356T6 | 234 | 15.0 | 166 | 10.8 | 5.0 | 70 100 |
2.68 |
| 356F | 130 | 8.4 | 120 | 80 | 2.0 | 55 | 2.68 |
| 356T6 | 207 | 13.3 | 138 | 8.9 | 3.0 | 70 | 2.68 |
| 356T7 | 214 | 13.8 | 126 | 8.1 | 3.0 | 75 | 2.68 |
| 356T51 | 159 | 10.2 | 110 | 7.1 | 3.0 | 60 | 2.68 |
| 356T71 | 172 | 11.1 | 124 | 8.0 | 3.0 | 60 | 2.68 |
| 40E | 215 | 13.9 | 170 | 11.0 | 4.0 | 60 100 |
2.80 |
| 712 | 224 | 14.4 | 172 | 11.1 | 4.0 | 75 | 2.80 |
| LM31 | 215 | 13.9 | 170 | 11.0 | 4.0 | 60 100 |
2.80 |
| Vanasil | 170 | 11.0 | 140 | 9.0 | 0.5 | 100 | 2.80 |
Comparision with International Specifications
BSI1490 |
ISO |
France |
Germany |
USA |
Aerospace |
LM25 |
AlSi7Mg |
A-S7g |
G-AISi7Mg |
A356 |
BS2L99 BSL173 BSL174 |
Comparison of LM25 physical properties with 6061 & 6082 wrought aluminium
LM25 |
6061 |
6082 |
|
Thermal Conductivity (% IACS) |
38.4 |
39.6 |
43.7 |
| Coefficient of linear expansion (20-100° C) |
22x10-6 |
24x10-6 |
23x10-6 |
| Electrical Conductivity (%IACS @ 20°C) |
39 |
43.1 |
43.7 |
| Hardness (Brinell) |
60 - 105 |
60 - 100 |
60 -100 |
| Modulus of Elasticity |
71 |
69 |
69 |
Silicon Magnesium series
These alloys are the best general purpose high strength cast alloys available and can be supplied with a variety of heat treatments
They also have good salt water corrosion resistance. They can be anodised to produce a thick black colour. Decorative anodising is not
possible due to the metallic silicon content.
A356 - An American specification introduced into the UK by Micro Metalsmiths in 1964. It is generally made available for American
Military specifications.
LM25 - Our most commonly used cast aluminium alloy and can be supplied as cast or heat treated.
2L99 - This is a more tightly controlled version of LM25 for aerospace applications.
Zinc Magnesium series
These alloys are less easy to cast because of their high viscosity in the liquid state.
40E - This alloy is particularly suitable for castings which require flame or dip brazing.
Components using this material should have uniform wall sections. To achieve corrosion resistance
an additional surface treatment such as anodising or chromatic conversion is necessary. The material
machines very well and is self ageing at room temperature over about three weeks.
712/LM31 - These alloys are similar to 40E but specific to defence and approved for certain space applications.
