High strength microalloyed magnesium alloy

Abstract

A magnesium composite material and method for manufacturing a magnesium composite alloy wherein the magnesium composite alloy has improved thermal and mechanical properties. The improved thermal and mechanical properties are at least in part obtained by the modification of grain boundary properties in the magnesium composite alloy by the addition of nanoscale fillers to the magnesium composite alloy.

1 - 27 . (canceled) 
     
     
         28 . A high strength, corrosion-resistant magnesium composite alloy that includes magnesium, Rare Earth Metal (RE), calcium and metal additive; a content of said magnesium in magnesium composite alloy is at least 80 wt. %; a content of said RE in magnesium composite alloy is 2.5-16 wt. %; a content of said zinc in magnesium composite alloy is 0.05-7.99 wt. % zinc; a content of said calcium in magnesium composite alloy is at 0.01-1; said metal additive includes one or more of 0.01-9.99 wt. % aluminum, up to 2 wt. % copper, indium, 0.01-1.9 wt. % manganese, 0.01-3 wt. % nickel, 0.01-1 wt. % niobium, silver, 0.01-2 wt. % strontium, 0.01-1 wt. % tin, 0.01-1 wt. % titanium, 0.01-1 wt. % vanadium, and/or 0.01-1.99 wt. % zirconium; said RE includes 0.1-10 wt. % yttrium and one or more metals selected from the group consisting of 0-2 wt. % cerium, 0-4 wt. % dysprosium, 0-4 wt. % erbium, 0-2 wt. % europium, 0-15 wt. % gadolinium, 0-2 wt. % lanthanum, 0-4 wt. % neodymium, 0.1-4 wt. % yttrium and 0-2 ytterbium; a weight ratio of said RE to said zinc is 1.5:1 to 20:1; a weight ratio of a combined weight percent of RE that is absent yttrium to yttrium 1:1 to 20:1; said magnesium composite alloy includes a LPSO phase and one or more of a) a magnesium- Rare Earth Metal phase and/or b) a phase that is absent Rare Earth Metal; said magnesium composite alloy has i) a thermal conductivity that is at least 170 W/m-K, ii) a tensile yield strength of greater than 280 MPa at 25° C., iii) a ductility exceeding 6% elongation to failure, iv) a UTS of at least 400 MPa, v) a YS of at least 300 MPa, and/or vi) an E f  of at least 6%. 
     
     
         29 . The magnesium composite alloy as defined in  claim 28 , wherein said magnesium composite alloy includes 0.5-3 wt. % zinc. 
     
     
         30 . The magnesium composite alloy as defined in  claim 28 , wherein said non-yttrium rare earth metal includes gadolinium and/or neodymium. 
     
     
         31 . The magnesium composite alloy as defined in  claim 29 , wherein said non-yttrium rare earth metal includes gadolinium and/or neodymium. 
     
     
         32 . The magnesium composite alloy as defined in  claim 28 , wherein said LPSO phase and/or said secondary precipitate phase has a maximum dimension of less than 100 mm. 
     
     
         33 . The magnesium composite alloy as defined in  claim 31 , wherein said LPSO phase and/or said secondary precipitate phase has a maximum dimension of less than 100 mm. 
     
     
         34 . The magnesium composite alloy as defined in  claim 28 , further including carbon, carbide, or oxide nanoparticles; said carbon, carbide, or oxide nanoparticles present in an amount of 0.5-3 wt. %. 
     
     
         35 . The magnesium composite alloy as defined in  claim 28 , further including carbon, carbide, or oxide nanoparticles; said carbon, carbide, or oxide nanoparticles present in an amount of 0.5-3 wt. %.