TABLE OF CONTENTS For softening aluminium alloys that have been hardened by cold work:
Alloys 1080A, 1050, 1200, 5251, 5154A, 5454, 5083 -360 C for 20 min.
Alloys 3103, 3105 - 400 425 C for 20 min.
Heat-treatable alloys that have not been heat treated - 360 C 10 C for 1 h and cool in air.
Alloys that have been heat treated - 400 425 C for 1 h and cool at 15 C/h to 300 C.
For Al-Zn-Mg alloys of the 7000 series, after cooling in air, reheat to 225 C for 2 4 h.
To relieve internal stress. Normally heat to 250 C followed by slow cooling is adequate.
Conditions for solution treatment and ageing for both cast and wrought aluminium alloys are given in Tables 7.1 and 7.2. For the alloy designation system and compositions see Chapter 3. Temper designations are given in Table 7.3.
| Material designation and temper | Solution treatment | Precipitation treatment | ||||
|---|---|---|---|---|---|---|
| Alloy type | Temperature C | Time [1] h | Quench [2] medium | Temperature C | Time [3] h | |
| BS 1490 | ||||||
| LM 4-TF | Al Si5 Cu3 | 505 520 | 6 16 | Hot water | 150 170 | 6 18 |
| LM 9-TE | Al Sil2 Mg | - | - | - | 150 170 | 16 |
| -TF | 520 535 | 2 8 | Water | 150 170 | 16 | |
| LM 10-TB | Al Mg10 | 425 435 | 8 | Oil at 160 C max [4] | - | - |
| LM 13-TE | Al Sil1 Mg Cu | - | - | - | 160 180 | 4 16 [ ] |
| -TF | 515 525 | 8 | Hot water | 160 180 | 4 16 | |
| -TF7 |
