Process for Production of a Carboxylic Acid/Diol Mixture Suitable for Use in Polyester Production

Abstract

Disclosed is a wrought magnesium alloy having excellent strength and extrusion or rolling formability, and a method of producing the same. The wrought magnesium alloy comprises 0.1-1.5 at % group IIIa, 1.0-4.0 at % group IIIb, 0.35 at % or less of one selected from the group consisting of groups IIa, IVa, VIIa, IVb, and a mixture thereof, 1.0 at % or less of group IIb, and a balance of Mg and unavoidable impurities and thus has a second phase composite microstructure. The wrought magnesium alloy of the present invention has high strength, toughness, and formability in addition to the electromagnetic wave shield ability of magnesium. Accordingly, the wrought magnesium alloy is a material useful to portable electronic goods, such as notebook personal computers, mobile phones, digital cameras, camcorders, CD players, PDA, or MP3 players, automotive parts, such as engine room hoods, oil pans, or inner panel of door, or structural parts for airplane.

1 . A wrought magnesium alloy having excellent formability and plating properties, which comprises 0.1-1.5 at % group IIIa 1.0-4.0 at % group IIIb, 0.35 at % or less of one selected from the group consisting of groups IIa, IVa, VIIa, IVb, and a mixture thereof, 1.0 at % or less of group IIb, and a balance of Mg and unavoidable impurities and thus has a second phase intermetallic compound. 
   
   
       2 . The wrought magnesium alloy as set forth in  claim 1 , wherein the group IIIa includes Sc, Y, and Lanthanides. 
   
   
       3 . The wrought magnesium alloy as set forth in  claim 1 , wherein the group IIIb includes Al and B. 
   
   
       4 . The wrought magnesium alloy as set forth in  claim 1 , wherein the group IIa includes Ca and Sr. 
   
   
       5 . The wrought magnesium alloy as set forth in  claim 1 , wherein the group IVa includes Ti, Zr, and Hf. 
   
   
       6 . The wrought magnesium alloy as set forth in  claim 1 , wherein the group VIIa includes Mn. 
   
   
       7 . The wrought magnesium alloy as set forth in  claim 1 , wherein the group IVb includes Si and Ge. 
   
   
       8 . The wrought magnesium alloy as set forth in  claim 1 , wherein the group IIb includes Zn and Cd, and a content of the group IIb is 0.65 at % or less. 
   
   
       9 . A method of producing a wrought magnesium alloy, comprising:
 extruding a magnesium alloy cast billet which comprises 0.1-1.5 at % group IIIa, 1.0-4.0 at % group IIIb, 0.35 at % or less of one selected from the group consisting of groups IIa, IVa, VIIa, IVb, and a mixture thereof 1.0 at % or less of group IIb, and a balance of Mg and unavoidable impurities and thus has a second phase intermetallic compound; and then rolling the magnesium alloy plate.