Magnesium alloy for precipitation strengthening extrusion and method of manufacturing the same

Abstract

A tin-containing magnesium alloy having superior tensile strength and superior elongation. A method of manufacturing a magnesium alloy includes melting and casting raw materials including an element selected from the group consisting of more than 0 weight % and 14 weight % or less of Sn, more than 0 weight % and 5 weight % or less of Li, more than 0 weight % and 40 weight % or less of Pb, more than 0 weight % and 17 weight % or less of Al, and more than 0 weight % and 5 weight % or less of Zn and a remainder of Mg, subjecting the cast magnesium alloy to solution treatment, subjecting the solution-treated magnesium alloy to aging, and plastically deforming the aged magnesium alloy. The magnesium alloy has second phases uniformly distributed in crystal grains, has a crystal grain size of 10 μm or less, and exhibits both

What is claimed is: 
     
         1 . A magnesium alloy comprising:
 an element selected from the group consisting of more than 0 weight % and 14 weight % or less of Sn, more than 0 weight % and 5 weight % or less of Li, more than 0 weight % and 40 weight % or less of Pb, more than 0 weight % and 17 weight % or less of Al, and more than 0 weight % and 5 weight % or less of Zn; and   a remainder of Mg, wherein   a second phase comprising at least one selected from the group consisting of Mg 2 Sn, Mg 2 Zn 3 , Mg 47.2 Zn 36.9 Al 16.9 , Mg 17 Al 12 , α-Mg/βLi phase and Mg 2 Pb is formed in the alloy, the second phase comprises precipitation phases, and, among the precipitation phases constituting the second phase, precipitation phases having a size exceeding 10 μm are less than 0.1% of the entire precipitation phases.   
     
     
         2 . The magnesium alloy of  claim 1 , wherein the second phase of the magnesium alloy is uniformly distributed in entire crystal grains. 
     
     
         3 . The magnesium alloy of  claim 1 , wherein the size of crystal grains of the magnesium alloy is substantially evenly distributed. 
     
     
         4 . The magnesium alloy of  claim 3 , wherein the second phase is Mg 2 Sn phase. 
     
     
         5 . The magnesium alloy of  claim 3 , wherein the magnesium alloy is a plastically deformed plate member. 
     
     
         6 . The magnesium alloy of  claim 3 , wherein the plastically deformed plate member is an extruded plate member. 
     
     
         7 . A method of manufacturing a magnesium alloy, the method comprising:
 melting and casting raw materials comprising an element selected from the group consisting of more than 0 weight % and 14 weight % or less of Sn, more than 0 weight % and 5 weight % or less of Li, more than 0 weight % and 40 weight % or less of Pb, more than 0 weight % and 17 weight % or less of Al, and more than 0 weight % and 5 weight % or less of Zn and a remainder of Mg;   subjecting the cast magnesium alloy to solution treatment;   subjecting the magnesium alloy that has undergone solution treatment to aging; and   plastically deforming the aged magnesium alloy, wherein a second phase comprising at least one selected from the group consisting of Mg 2 Sn, Mg 2 Zn 3 , Mg 47.2 Zn 36.9 Al 16.9 , Mg 17 Al 12 , α-Mg/β-Li phase, and Mg 2 Pb is formed in the alloy, the second phase comprises precipitation phases, and, among the precipitation phases constituting the second phase, precipitation phases having a size exceeding 10 μm are less than 0.1% of the entire precipitation phases.   
     
     
         8 . The method of  claim 7 , wherein the size of crystal grains of the magnesium alloy is substantially evenly distributed. 
     
     
         9 . The method of  claim 7 , wherein the second phase is uniformly distributed in entire crystal grains. 
     
     
         10 . The method of  claim 7 , further comprising: after the plastically deforming the aged magnesium alloy, annealing the plastically deformed alloy. 
     
     
         11 . The method of  claim 10 , wherein the plastic deformation is extrusion. 
     
     
         12 . The method of  claim 8 , further comprising: after the plastically deforming the aged magnesium alloy, annealing the plastically deformed alloy. 
     
     
         13 . The method of  claim 12 , wherein the plastic deformation is extrusion. 
     
     
         14 . The method of  claim 9 , further comprising: after the plastically deforming the aged magnesium alloy, annealing the plastically deformed alloy. 
     
     
         15 . The method of  claim 14 , wherein the plastic deformation is extrusion.