# US 10,767,248 B2 · Plastic deformation magnesium alloy having excellent thermal conductivity and flame retardancy, and preparation method

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- Number: US 10,767,248 B2
- Document ID: US10767248B2
- Status: Granted
- Kind: B2
- Application number: 15/553,688
- Filed: 2016-02-24
- Published: 2018-02-01
- Granted: 2020-09-08
- Earliest claimed: 2015-02-25
- Assignees: In-Young Lee
- Applicants: In-Young Lee
- Inventors: In-Young Lee; Kang-Hyung Kim; Hyun-Seok Jeon
- Web page: https://patentgrep.com/patent/US10767248B2

## CPC

- C22C 23/04: with zinc or cadmium as the next major constituent
- C22C 1/02: by melting {(C22C1/1036 takes precedence)}
- C22C 23/06: with a rare earth metal as the next major constituent
- C22C: ALLOYS (treatment of alloys C21D, C22F)

## Abstract

Disclosed is a magnesium alloy that has high thermal conductivity and flame retardancy and facilitates plastic working, wherein magnesium is added with 0.5 to 5 wt % of zinc (Zn) and 0.3 to 2.0 wt % of at least one of yttrium (Y) and mischmetal, with, as necessary, 1.0 wt % or less of at least one selected from among calcium (Ca), silicon (Si), manganese (Mn) and tin (Sn), the total amount of alloy elements being 2.5 to 6 wt %. A method of manufacturing the same is also provided, including preparing a magnesium-zinc alloy melt in a melting furnace, adding high-melting-point elements in the form of a master alloy and melting them, and performing mechanical stirring during cooling of a cast material in a continuous casting mold containing the magnesium alloy melt, thus producing a magnesium alloy cast material having low segregation, after which a chill is removed from the cast material or diffusion annealing is performed, followed by molding through a tempering process such as rolling, extrusion or forging. This magnesium alloy is improved in ductility by the action of alloy elements for inhibiting the formation of lamella precipitates due to a low-melting-point eutectic phase in a magnesium matrix structure, can be extruded even at a pressure of 1,000 kgf/cm2 or less due to the increased plasticity thereof, and can exhibit thermal conductivity of 100 W/m·K or more and flame retardancy satisfying the requirements for aircraft materials and is thus suitable for use in fields requiring fire safety, thereby realizing wide application thereof as a heat sink or a structural material for portable appliances, vehicles and aircraft components and contributing to weight reduction.

## Claims

### Claim 1

A plastic deformation magnesium alloy having thermal conductivity, flame retardancy, and facilitating plastic working, the magnesium alloy consisting of:
0.5 to 5 wt % of zinc;
0.3 to 2.0 wt % of at least one of yttrium, lanthanum and mischmetal as oxide-film-forming elements;
less than 1.0 wt % of at least one selected from among calcium, silicon, and tin, wherein a total amount of alloy elements is 2.5 to 6 wt %; and the balance magnesium.

### Claim 2 (depends on 1)

The plastic deformation magnesium alloy of claim 1, wherein the oxide-film-forming element is the lanthanum.