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Aluminum alloy of age hardening type
| Details |
Inventors: Baba, Yoshio; Kawai, Mituhiro;
Assignee: Sumitomo Light Metal Industries, Ltd. (Tokyo, JA)
Primary Examiner: Dean; R.
Assistant Examiner:
Attorney, Agent or Firm: Browdy and Neimark
An aluminum alloy of age-hardening type indispensably containing copper, magnesium and silicon, being optionally added thereto traces of any one or more than one element selected from vanadium, manganese, chromium, zirconium and titanium. A sheet or strip made from said alloy ingot, being submitted to solution treatment followed by precipitation process can improve forming properties, such as tensile strength, LDR and/or earing ratio, and be free from stretcher-strain marks. Said sheet or strip maintains high strength particularly when it is submitted to baking i.e. high temperature curing of paint coated thereon. |
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DETAILED DESCRIPTION Ranges in weight percents of various constituents which are or may be included in an alloy that falls within the scope of the present invention are set forth below in Table I.
TABLE I
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Ranges of Components
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Components
Ranges in weight percents
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Copper 1.
2 - 1.
9
Magnesium
0.
4 - 1.
0 indispensable
Silicon 0.
3 - 0.
8
Vanadium 0.
01 - 0.
16
Manganese
0.
05 - 0.
5 any one or more than one
Chromium 0.
02 - 0.
2 of the elements as
Zirconium
0.
02 - 0.
2 necessary
Titanium 0.
02 - 0.
2
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Effects of various components of alloys of the invention and reasons of the ranges specified in Table I will be explained below.
(Percentages used in this specification are all indicated by weight.
) Copper is a strengthening element and improves deep forming properties, but the strengthening effect will be reduced when its content is less than 1.
20 percent and the corrosion resistance may be decreased in case of more than 1.
9 percent.
Magnesium has a strengthening effect on the alloy together with silicon, but the effect, as the test results have indicated, will be reduced when its content is less than 0.
4 percent, and the forming characteristics and age-hardening properties will be unfavorably effected and stress-corrosion cracks may occur in case of more than 1.
0 percent.
Silicon has the same influences as magnesium on the alloy when its content deviates from the range specified in Table I.
Vanadium serves to improve the strength at softening state and to atomize (minimize) the crystal particles.
When its content is less than 0.
01 percent, the effects will be reduced and in the case of more than 0.
16 percent giant compounds of vanadium may generate within the ingot, and decrease the forming characteristics.
Manganese, chromium, zirconium and titanium have the same influences as vanadium on the alloy when their contents deviate respectively from the ranges specified in Table I
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Molecular Biology 
