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Safety component moulded in a1-si alloy

Inactive Publication Date: 2004-03-11
ALUMINUM PECHINEY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the mechanical strength is limited by the hardening capacity of the Mg.sub.2Si phase.
But, due to the hardening caused by these Cu contents, the elongation becomes low and resistance to corrosion mediocre, and usually insufficient for automobile safety parts.

Method used

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  • Safety component moulded in a1-si alloy
  • Safety component moulded in a1-si alloy

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0042] The three alloys A, B and C with the composition (by weight %) shown in Table 1 below, which differ essentially in their copper content, were cast in the form of 18 mm diameter test shell pieces according to standard NF A 57-702.

1 TABLE 1 Alloy Si Fe Cu Mg Ti A 6.95 0.12 0.01 0.60 0.12 B 6.85 0.13 0.47 0.58 0.13 C 6.87 0.13 0.94 0.59 0.13

[0043] After casting, the test pieces are hot isostatically compacted in order to eliminate all microporosity, this compaction being representative of the different moulding processes including a high pressure compaction phase during solidification such as die casting, squeeze casting, thixocasting, rheocasting or casting with lost foam models under isostatic pressure, or after solidification, such as casting--die stamping.

[0044] The test pieces are then solution heat treted with preliminary levels in order to redissolve eutectics containing copper, and a main level for homogenisation and globulisation of eutectic silicon lasting for 16 h at ...

example 2

[0054] Test pieces with three alloys D, E and F at 4% silicon were prepared under the same conditions as in example 1. The composition of each test piece (% by weight) is given in Table 4:

4 TABLE 4 Alloy Si Fe Cu Mg Ti D 4.0 0.11 0.03 0.63 0.13 E 3.9 0.08 0.44 0.63 0.13 F 4.1 0.09 0.85 0.64 0.13

[0055] After the different ageings, the same parameters were measured as for example 1, and the values are given in Table 5:

5TABLE 5 Alloy Ageing R.sub.m R.sub.p0.2 A HB Q D 6 h / 160.degree. C. 342 266 15.0 119 518 D 10 h / 170.degree. C. 358 309 11.2 124 515 E 16 h / 170.degree. C. 378 322 11.6 132 538 F 16 h / 170.degree. C. 388 319 9.3 132 533

[0056] Firstly, it was observed that the alloy D without any copper and with 4% silicon has better ultimate tensile strength and better elongation, and therefore a substantially improved quality index, than alloy A in example 1 with 7% of silicon.

[0057] It is also observed that with copper alloys and ageing according to the invention, the ultimate tensile st...

example 3

[0058] Alloys E and F in example 2 were replaced by alloys E' and F' with the same composition except for iron, and the iron content of these two alloys was modified to 0.18 and 0.16% respectively. With the same heat treatment comprising 16 h ageing at 170.degree. C., the elongations A obtained were equal to 7.5% and 6.8% respectively, representing reductions of 35% and 27% respectively.

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Abstract

The invention concerns a safety component with high mechanical strength and good ductility, moulded in Al-Si alloy consisting (in wt. %) of: Si: 2-11; Mg: 0.3-0.7; Cu: 0.3 0.9; other elements <1 each and <2 in total, the rest being aluminium, and solution heat treated, tempered and hardened resulting in Brinell hardness of more than 125. The invention also concerns a safety component with high mechanical resistance and good ductility, moulded in Al-Si alloy consisting (in wt. %) of: Si: 2-6; Mg: 0.3-0.7; Fe <0.20; other elements <0.3 each and <1 in total; the rest being aluminium; solution heat treated, hardened and tempered resulting in a quality index Q=Rm+log A>485 MPa.

Description

[0001] The invention relates to the manufacture of cast safety parts intended particularly for automobiles, for example such as suspension parts made of hypoeutectic Al--Si alloys, these parts having high mechanical strength, sufficient ductility, good corrosion resistance and good metallurgical soundness, after heat treatment.STATE OF THE ART[0002] The use of aluminium alloys for cast parts is developing quickly in automobiles, particularly for safety parts such as connections to the ground, in order to reduce the weight of the vehicle. This weight reduction is particularly significant because a high mechanical strength can also be obtained after heat treatment. Furthermore, for this type of part, it is essential to have sufficient ductility to prevent a brittle failure after a shock, good corrosion resistance, particularly stress corrosion, to prevent deterioration of the part in a corrosive environment such as road salt, and lack of shrinkage, particularly on the surface, which c...

Claims

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Application Information

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IPC IPC(8): C22C21/02C22C21/04C22F1/043
CPCC22C21/02C22F1/043C22C21/04
Inventor GARAT, MICHELCOSSE, FRANCOIS
Owner ALUMINUM PECHINEY
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