# US 11,028,462 B2 · Suppression of samson phase formation in Al—Mg alloys by boron addition

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- Number: US 11,028,462 B2
- Document ID: US11028462B2
- Status: Granted
- Kind: B2
- Application number: 15/977,482
- Filed: 2018-05-11
- Published: 2018-11-29
- Granted: 2021-06-08
- Earliest claimed: 2017-05-23
- Assignees: The Government of the United States of America, as represented by the Secretary of the Navy
- Applicants: The Government of the United States of America, as represented by the Secretary of the Navy
- Inventors: Ramasis Goswami; Syed B. Qadri
- Web page: https://patentgrep.com/patent/US11028462B2

## CPC

- C22C 1/03: using master alloys
- C22C 1/02: by melting {(C22C1/1036 takes precedence)}
- C22C 1/026: {Alloys based on aluminium}
- C22C 1/1094: {comprising an after-treatment}
- C22C 21/06: with magnesium as the next major constituent
- C22F 1/047: of alloys with magnesium as the next major constituent
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- C22F: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass, C23F17/00)

## Abstract

A method of suppressing the Samson phase, Al3Mg2, at grain boundaries in Aluminum, comprising providing aluminum in a container, adding boron to the container, providing an inert atmosphere, arc-melting the aluminum and the boron, and mixing the aluminum and the boron in the container to form an alloy mixture. An aluminum magnesium alloy with reduced Samson phase at grain boundaries made from the method of providing aluminum in a container, adding boron to the container, providing an inert atmosphere, arc-melting the aluminum and the boron, and mixing the aluminum and the boron in the container to form an alloy mixture.

## Claims

### Claim 1

A method of suppressing the Samson phase, Al3Mg2, at grain boundaries in aluminum, comprising:
providing aluminum in a container;
adding boron to the container;
providing an inert atmosphere;
arc-melting the aluminum and the boron;
mixing the aluminum and the boron in the container to form an alloy mixture;
wherein the aluminum is Al-5083 or Al-5456 and wherein the boron reduces supersaturation of magnesium;
wherein the boron traps the magnesium in a solid solution as AlMgB2 phase;
further comprising the steps of
adding copper to the container prior to the step of providing the inert atmosphere;
arc-melting the aluminum and the boron and the copper;
mixing and homogenizing the aluminum, the boron and the copper in the container to form an alloy mixture;
wherein the step of mixing and homogenizing is at 500° C. for 2 hours; and
annealing at 150° C. for about 190 hours.

### Claim 2 (depends on 1)

The method of suppressing the Samson phase, Al3Mg2, at grain boundaries in aluminum of claim 1 further comprising the steps of:
repeating the step of arc-melting the aluminum, the boron and the copper in the container; and
ensuring homogeneity of the alloy mixture.