US2116275A - Aluminium alloy - Google Patents

Description

Patented May 3, 1938 UNITED. STATES 7 2,110,275 ALUMINIUM ALLOY Yonosuk'e Matuenaga, Naka-ku, Yokohama,

Japana No Drawing. Application November 12, 1936,

Serial No. 110,554.

1 Claim.

This application is a continuation-in-part of applicant's copending application Serial No. 78,722 filed May 8, 1936.

' This invention relates to an aluminium alloy 5 comprising main and auxiliary elements, the main elements consisting of 2 to 5% magnesium, 6 to 14% zinc, 0.2 to 2.5% copper, 0.1 to 2.0% nickel, 0.01 to 1.5% iron, 0.1 to 1.0% silicon and the rest substantially aluminium, while the auxiliary elements consisting of a metal selected from the group .of 0.1m 1.5% manganese, 0.1 "to 0.5% ti- 1 tanium and 0.1 to 1.0% lithium. The object of the invention is to obtain an aluminium alloy which has a great tensile strength especially when In Japan May 13, 1935 Example 3 C 1.15 Ni--- 0.7

Fe 0.2 Si..- 0.8 1.1-- 0.3 Al Rest Tensile strength kg./cm. 57 Elongation, percent; 11

The alloy may also contain two or more of the auxiliary metals as to be seen in the follow- 15 subjected under heat treatment. examples, 15

The new alloy may also contain a small quantity Example 4 of-cobalt, molybdenum, vanadium, tungsten or beryllium without appreciable change of the na- 1% 11% 111% IV% tures. Mg 2.85 3.15 3.00 3.50 Examples of the alloy showing percentages of Zn 9. .00 9.00 2 the elements employed and also tensile strength 00.. 0.40 0.65 0.80 0.95 and elongation when the alloys are subjected NL--"----,- 5 0 .85' under-a mode of tempering and annealing are Fe 0.50 1.00 1.25 1.50 given as follows: Si 0.60 0.60 0.60 0.60 Example 1 Mn 0.80 0.80 0.80 0.80 25 Ti 0.04 0.08 0.10 0.12 M 2,5 Al Rest Best Best Rest Zn 9,0 Tensile strength 00.. 1.0 Isa/cm. 63.0 65.5 69.5 68.5 30101 L0 Elongation, percent. 9.0 6.0 I 3.5 3.0 When the percentage of iron is decreased, the 31 hardness is increased as follows: v f, g. v% v1% vn% mm 35 Tensile strength kg./cm.= 00 Mg 3.50 3.50 3.50 3.50 35 Elongation, per 10 Zn 9.00 9.00 9.00 I 9.00 Cu. 0.09 0.09 0.09 0.09 Exam le 2 N1 0.85 0.85 0.85 1.20 40 p Fe 0.08 0.00 0.00 0.08 40 Si 0.60 0.30 0.30 0.30 if, 2'3 Mn 0.00 0.00 1.20 0.80 cm Ti 0.12 0.12 0.12 0.12 m A] Rest Rest Rest Rest Tensile strength kgJcm. 07.9 70.0 "71.1 71.0.v 45 g: Elongation, percent 3.9 4.8 6.8 6.0 T A1 a v Rest About About About About 'Tensile strength kgJcm. as Lockwell--. .07 97 I .97 07 b Brinell--. 210 to Elongation, :percent 10 Example 5 Mg- 2.85 Zn 9.0 c 0.5 Ni 0.3 F 0.3 Si 0.9 Tl 0.04 Li 0.2 M Rest Tensile strength kg./cm.= 59 Elongation, per cent 9 Example 6 Mg 2.85 Zn 9.0 C 0.5 Ni 0.3 Fe 0.2 Si 0.8 Ti 0.2 Li 0.2 Al Rest Tensile strength kg./cm.'- 60 Elongation, per cent 8 Example 7 Mg 2.85 2.85 2.85 2.85 Zn 9.0 9.0 9.0 9.0 Cu 0.5 0.5 0.5 0.5 Ni 0.3 0.3 0.3 0.3 Fe 0.2 0.2 0.2 0.2 St 0.8 0.8 0.8 0.8 Mn 0.8 0.8 0.8 0.8 Ti 0.2 0.2 0.2 0.2 Li 0.1 0.1 0.4 1.0 Al Rest Rest Rest Rest Tensile strength kg./cm.= 69.0 64.6 63.7 64.9 4.0

Elongation, per cent. 6.8 11.4 11.2

As seen from the above examples, the new' alloy has a very great tensile strength which is hardly obtainable in known aluminium alloys.

As to mutual actions of the elements for the new alloy, it is supposed as follows. A part of magnesium may combine with silicon to form magnesium silicide, and another part of magnesium may be alloyed with a part of zinc and a part of aluminium to form various three elemental alloys ot diflerent percentage. Further copper and nickel may be alloyed with iron. These chemical compounds and alloys may crystal out in the main element, viz., aluminium and may be uniformly distributed therein. Further, when manganese is employed, this manganese and titanium not only act as reducing agents, but also hinders the growth of particles of zinc-manganese-aluminium alloys and also of copper-nickeliron alloy so that the distribution of the alloy may be promoted.

Also, as shown in Example 4, the smaller percentage of iron gives a greater hardness. This fact is supposed to be that alloys of iron and other elements may be of smaller hardness as compared with the alloys containing no iron so that an alloy having a smaller percentage of less hardness may have a greater hardness. Also, it is supposed that iron has a tendency of decreasing the tensile strength and elongation while this drawback is eliminated by using silicon or silicon and manganese in a greater percentage.

What I claim is:--

An aluminium alloy containing 2 to magnesium, 6 to 14% zinc, 0.2 to 2.5% copper, 0.1 to 2.0% nickel, 0.01 to 0.5% iron, 0.1 to'1.0% silicon, 0.1 to 1.5% manganese, and the rest aluminium.

YONOSUKE MA'I'UENAGA.