Magnesium-based alloy for wrought applications

Patent metadata

Field	Value
Publication number	US-9945011-B2
Application number	US-201113699402-A
Country	US
Kind code	B2
Filing date	May 24, 2011
Priority date	May 24, 2010
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

An improved magnesium-based alloy for wrought applications is disclosed, including a method of fabricating alloy sheet from said alloy. The improved magnesium-based alloy consists of: 0.5 to 4.0% by weight zinc; 0.02 to 0.70% by weight a rare earth element, or mixture of the same including gadolinium; and incidental impurities. The rare earth element in some embodiments may be yttrium and/or gadolinium. In some embodiments the magnesium-based alloy may also consist of a grain refiner and in some embodiments the grain refiner may be zirconium. In combination, the inclusion of zinc and a rare earth element, into the magnesium alloy may have enhanced capacity for rolling workability, deep drawing at low temperatures and stretch formability at room temperature. The improved alloy may also exhibit increased tensile strength and formability while evincing a reduced tendency for tearing during preparation.

First claim

The invention claimed is:

1. A twin-roll cast magnesium-based alloy with a crystalline structure for wrought applications consisting of:
0.5 to 4.0% by weight zinc;
0.1 to 0.65% by weight gadolinium; and
the remainder being magnesium except for incidental impurities selected from Mn, Fe, Cu, Ni, Al or Si,
wherein the total weight of the incidental impurities is less than 0.5% by total weight of the alloy, and
wherein the alloy has a 0.2% proof stress of 174.5 MPa±1.8 MPa to 260.8±5.5 MPa in a 0° orientation, a 0.2% proof stress of at least 179.6 MPa±2.4 MPa to 221.5±5.4 MPa in a 45° orientation, and a 0.2% proof stress of at least 185.8 MPa±2.2 MPa to 227.5±3.7 MPa in a 90° orientation.

2. The alloy according to claim 1 , wherein the weight of zinc is 1.0 to 3.0%.

3. The alloy according to claim 1 , wherein the alloy is suitable for drawing at a temperature of around 135° C. to achieve a limiting draw ratio of 2.05.

Assignees

• Venkatesan Kishore
• Borbidge Wendy Elizabeth
• Kellam Michael Edward
• Liang Daniel
• Lynch Peter Adrian
• Song Guangsheng
• Commw Scient Ind Res Org

Inventors

• Venkatesan Kishore
• Borbidge Wendy Elizabeth
• Kellam Michael Edward
• Liang Daniel
• Lynch Peter Adrian
• Song Guangsheng

Classifications

• C22C23/06 Primary

  with a rare earth metal as the next major constituent · CPC title

• C22C23/04 Primary

  with zinc or cadmium as the next major constituent · CPC title

• C22F1/06

  of magnesium or alloys based thereon · CPC title

• B22D21/007

  with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C · CPC title

• C22C23/00 Primary

  Alloys based on magnesium · CPC title