Alloy for Pressure Die-Casting

Abstract

An aluminium, magnesium and silicon-based die casting alloy having 5.0-7.0 wt. % magnesium, 1.5-7.0 wt. % silicon, 0.3-0.8 wt. % manganese, 0.03-0.5 wt. % iron, 0.01-0.4 wt. % molybdenum, 0.01-0.3 wt. % zirconium, 0-0.25 wt. % titanium, 0-0.25 wt. % strontium, 0-250 ppm phosphorus, 0-4 wt. % copper and 1-10 wt. % zinc, the remainder being aluminium and inevitable impurities.

Claims

1. An aluminium-magnesium-silicon-based alloy for pressure die casting, comprising TABLE-US-00004 magnesium 5.0-7.0% by weight silicon 1.5-4.0% by weight iron 0.03-0.5% by weight manganese 0.3-0.8% by weight zirconium 0.01-0.4% by weight molybdenum 0.01-0.4% by weight vanadium 0.01-0.03% by weight beryllium 0.001-0.005% by weight titanium 0-0.15% by weight strontium 0-0.1% by weight phosphorus 0-250 ppm copper 0-4% by weight zinc 0-10% by weight the remainder being aluminium and unavoidable impurities.

2. The alloy for pressure die casting according to claim 1, wherein molybdenum is 0.05 to 0.20% by weight.

3. The alloy for pressure die casting according to claim 1, wherein zirconium is 0.05 to 0.20% by weight.

4. The alloy for pressure die casting according to claim 1, wherein silicon is 2.2 to 3.0% by weight.

5. The alloy for pressure die casting according to claim 1, wherein magnesium is 5.5 to 6.5% by weight.

6. The alloy for pressure die casting according to claim 1, wherein titanium is 0-0.08% by weight.

7. The alloy for pressure die casting according to claim 1, wherein iron is 0.05 to 0.2% by weight.

8. The alloy for pressure die casting according to claim 1, wherein copper is 0-0.2% by weight.

9. The alloy for pressure die casting according to claim 1, wherein zinc is 0-0.5% by weight.

10. The alloy for pressure die casting according to claim 1, wherein strontium is 0-0.01% by weight.

11. A structural component comprising an alloy for pressure die casting according to claim 1.

12. The alloy for pressure die casting according to claim 1, consisting of TABLE-US-00005 magnesium 5.0-7.0% by weight silicon 1.5-4.0% by weight iron 0.03-0.5% by weight manganese 0.3-0.8% by weight zirconium 0.01-0.4% by weight molybdenum 0.01-0.4% by weight vanadium 0.01-0.03% by weight beryllium 0.001-0.005% by weight titanium 0-0.15% by weight strontium 0-0.1% by weight phosphorus 0-250 ppm copper 0-4% by weight zinc 0-10% by weight the remainder being aluminium and unavoidable impurities.

Description

COMPARATIVE EXAMPLE

[0040] The compositions of a comparable alloy as disclosed in EP 0 853 133B1 (Alloy 1) and three illustrative embodiments (Alloys A, B and C) of the alloy according to the present invention are compared hereinafter. The data are presented as % by weight. Using these three alloys, the mechanical characteristics (R.sub.m, Rp.sub.0.2 and As) were measured on pressure die-cast 3 mm plates. The mean value from 8 tensile tests is presented. The results were determined in the cast state (State F), in the T5 state (controlled cooling with subsequent artificial aging) and in the T6 state (solution annealing with full artificial aging).

TABLE-US-00002 Mg Si Mn Fe Cu Zn Alloy 1 5.79 2.34 0.66 0.09 0.001 0.01 Alloy A 6.31 2.50 0.69 0.10 0.002 0.00 Alloy B 6.21 2.61 0.46 0.19 0.02 0.03 Alloy C 5.25 2.19 0.64 0.10 0.20 5.62 Ti V Be Zr Mo P Alloy 1 0.083 0.028 0.0027 0.000 0.000 0.0002 Alloy A 0.006 0.013 0.0028 0.081 0.050 0.0002 Alloy B 0.004 0.015 0.0023 0.100 0.068 0.0002 Alloy C 0.150 0.022 0.0004 0.001 0.001 0.0004

[0041] Results Achieved

TABLE-US-00003 Rm RP.sub.0.2 A.sub.5 [N/mm.sup.2] [N/mm.sup.2] [%] F state Alloy 1 315 179 11.5 Alloy A 355 213 10.7 Alloy B 342 209 9.2 Alloy C 375 265 4.9 T5 state Alloy 1 313 213 9.0 Alloy A 370 236 10.1 Alloy B 354 232 8.5 Alloy C 370 279 3.4 T6 state Alloy 1 292 186 9.0 Alloy C 429 363 4.4