US1903842A

US1903842A - Aluminum alloy

Info

Publication number: US1903842A
Application number: US612651A
Authority: US
Inventors: Court C Titus
Original assignee: Individual
Current assignee: Individual
Priority date: 1932-05-20
Filing date: 1932-05-20
Publication date: 1933-04-18
Anticipated expiration: 1950-04-18

Description

Patented Apr. 18,

oouar c. mus, onmiw YORK, 11.x.

ALUMINUM ALLOY Ho Drawing.

My invention relates to a series of aluminum alloys of novel composition and properties. The alloys of my invention are articularly characterized by the presence boron and magnesium and by-the absence of substantial amounts of silicon, copper and iron. The presence of one or more metals of the group comprising vanadium, tungsten, molybdenum, chromium and cobalt, is also characteristic of the preferred form of my new alloys.

The alloys of the invention combine light weight with a high hardness and tensile strength. A surprisin property ofthe new alloys is their high e ectrical conductivity and resistance to corrosion.

The metals may be utilized either in the cast condition, or they maybe rolled, drawn orotherwise worked. Mechanical working is preferably carried out at a temperature of l50450 C. and such working efiects a material increase in the tensile strength of the alloys. Wire drawn from the alloys of the invention is particularly valuable, since it combines a relatively high tensile strength with a relatively high conductivity. A further valuable property of such wires is that sleet and snow do not readily stick to them.

A particularly valuable alloy embodying my invention has the following composition:

Magnesium 1.25% Boron 0.75% Vanadium 0.75% 85 Tungsten 0.7 5%

Aluminum -rema'inder The amount of magnesium may vary from about 0.25% to about 2.25%, the preferred 7 40 amount being from 0.75% to 1.5% and the boron from 0.05% to 2%, although at"lea,st'

I higher amounts. Either vanadiumor tungsten may be used alone in these alloys, and either or both may be replaced in whole or in part b one or more of the metals molybdenum, c romium and cobalt. In neral it Wis advantageous to use the meta s of the als as oxides.

.s. Applic'ationflcd lay 20.1w. mm No. 818,651.

group including vanadium, tungsten,-molybenum, chromium and cobalt in amounts of from 0.25% to 3.0%; larger amounts may be used, but the" tend to increase the specific. gravity and t e cost of the alloy.

In general it may be said that a principal I function of boron in the'alloys of the invention is to increase the hardness; a principal function of the magnesium is to decrease the specific gravity and increase the resistance of the alloys against corrosion; and the rincipal function of the tungs'ten, vana ium, molybdenum, cobalt andchromium is to increase-the tensile strength of the alloys.

Alloys of the invention as described above have been obtained having a specific gravity .of 2.66 to 2.70; a tensile strength when cast of 30,000to 41,000 pounds per square inch, and when mechanically worked of from 51,000 to 56,000 pounds; and an. electrical conductivity of 50-58 (Ag=100).

An advantageous method of producing the alloys of the invention is as follows: The aluminum is melted in a crucible and covered with a layer of powderedcharcoal. The charcoal servesto protect the metal from oxidation and to reduce those metals which are added in the form of oxides. The magnesium is added as metal and the boron, tungsten and vanadium or their substituting met- The added metals or their oxides are advantageously added enclosed in aluminum capsules. The boronoxide is pref-, erahly added first, although it may be added together with the magnesium. The other metal oxides may be added together.

I claim: 1. An alloy consisting principally of aluminum and containing from 0.05 to 2% of boron, from 0.25 to 2.25% of magnesium, and

from 0.25 to 3% of at least one metal of the group consisting of vanadium, tungsten,v

molybdenum and chromium. f

2. Anv alloy consisting principally ofaluminum and containing from 0.25 to 0.75%

of boron, from 0.75 to 1.5% of magnesium,

and from 0.25% to 3% of at least one metal of the group consisting of vanadium, tungsten,

molybdenum and chromium.

2 amsms 3. An alloy of about the following cmpw sition Magnesium 1.25% Boron 0.75% 5 Vanadium 0.75%

Tungsten 0.75%;

and the remainder rincipally aluminum. 4. An alloy consisting principally of aluminum and containing from 0.05130 2% 0i? boron, from 0.25 to 2.25% of magnesium and from 0.25% to 3% of vanadium. In testimony whereoibl afiix my signature.

C URT Q. TKTUS.