High strength, combustion-resistant, tube-extrudable aircraft-grade magnesium alloy

A magnesium-based extrusion alloy composition comprising, by weight:

• 7.0%-11.0% Al, 0.1%-0.8% Zn, 0.15%-0.65% Mn, more than 0.63% Ca, less than 0.56% Y and a balance of Mg and unavoidable impurities;
• and
• wherein a total combined content of said Al, Ca, and Y does not exceed 11 wt % of said alloy;
• and
• wherein said alloy comprises Ca in the form of intermetallic particles;
• wherein said intermetallic compounds of Ca and Y comprise:
• Mg—Al—Ca compounds and Al—Mn—Y compounds, respectively;
• wherein said Ca and Y intermetallic compounds contribute to flammability resistance of wrought products made from said alloy;
• wherein said intermetallic particles are formed in a wrought process, including extrusion, rolling, or forging;
• when said alloy is provided in a matrix phase, said intermetallic particles making up said alloy have an average diameter of 10 μm or less;
• said alloy comprises Ca intermetallic particles and said intermetallic particles make up between 1.0% to 5.0% of said alloy by volume;
• and
• said magnesium-based extrusion alloy composition is a forged or drawn alloy that has a yield strength of at least 170 MPa, an ultimate tensile strength of at least 280 MPa and an elongation of at least 7% in tube forms.