Magnesium-based alloy powder and magnesium-based alloy molded article

Abstract

A magnesium-based alloy powder is provided that comprises a magnesium-based alloy containing 0.2 mass % to 5 mass % of calcium. The magnesium-based alloy powder has an average particle diameter of 100 μm to 1,500 μm. The mean value of hardness variation index values obtained by dividing the difference of the maximum value and the minimum value of micro Vickers hardnesses taken at 10 measurement points in a particle cross section by the maximum value is 0.3 or less. The magnesium-based alloy powder has a particle surface coated with a calcium oxide-containing coating layer.

What is claimed is: 
     
         1 . A magnesium-based alloy powder comprising a magnesium-based alloy that contains 0.2 mass % to 5 mass % of calcium,
 wherein the magnesium-based alloy powder has an average particle diameter of 100 μm to 1,500 μm,   wherein the mean value of hardness variation index values obtained by dividing the difference of the maximum value and the minimum value of micro Vickers hardnesses taken at 10 measurement points in a particle cross section by the maximum value is 0.3 or less, and   wherein the magnesium-based alloy powder has a particle surface coated with a calcium oxide-containing coating layer.   
     
     
         2 . The magnesium-based alloy powder according to  claim 1 , wherein the highest peak intensity derived from an intermetallic compound of calcium and aluminum is 3% to 40% of the highest peak intensity derived from magnesium in an X-ray diffraction spectrum of the magnesium-based alloy powder. 
     
     
         3 . The magnesium-based alloy powder according to  claim 1 , wherein the coating layer is primarily a mixture of calcium oxide and magnesium oxide. 
     
     
         4 . The magnesium-based alloy powder according to  claim 1 , wherein the magnesium-based alloy further comprises 2.5 mass % to 12 mass % of aluminum. 
     
     
         5 . The magnesium-based alloy powder according to  claim 1 , wherein the average dendrite arm spacing (DAS) in a crystal structure of the magnesium-based alloy powder is 0.05 μm to 5 μm. 
     
     
         6 . The magnesium-based alloy powder according to  claim 1 , wherein the magnesium-based alloy powder is produced by using high-speed rotary water jet atomization. 
     
     
         7 . A magnesium-based alloy molded article produced by using the magnesium-based alloy powder of  claim 1 . 
     
     
         8 . A magnesium-based alloy molded article produced by using the magnesium-based alloy powder of  claim 2 . 
     
     
         9 . A magnesium-based alloy molded article produced by using the magnesium-based alloy powder of  claim 3 . 
     
     
         10 . A magnesium-based alloy molded article produced by using the magnesium-based alloy powder of  claim 4 . 
     
     
         11 . A magnesium-based alloy molded article produced by using the magnesium-based alloy powder of  claim 5 . 
     
     
         12 . A magnesium-based alloy molded article produced by using the magnesium-based alloy powder of  claim 6 . 
     
     
         13 . The magnesium-based alloy molded article according to  claim 7 , wherein the magnesium-based alloy molded article is produced through hot extrusion of the magnesium-based alloy powder. 
     
     
         14 . The magnesium-based alloy molded article according to  claim 8 , wherein the magnesium-based alloy molded article is produced through hot extrusion of the magnesium-based alloy powder. 
     
     
         15 . The magnesium-based alloy molded article according to  claim 9 , wherein the magnesium-based alloy molded article is produced through hot extrusion of the magnesium-based alloy powder. 
     
     
         16 . The magnesium-based alloy molded article according to  claim 10 , wherein the magnesium-based alloy molded article is produced through hot extrusion of the magnesium-based alloy powder. 
     
     
         17 . The magnesium-based alloy molded article according to  claim 11 , wherein the magnesium-based alloy molded article is produced through hot extrusion of the magnesium-based alloy powder. 
     
     
         18 . The magnesium-based alloy molded article according to  claim 12 , wherein the magnesium-based alloy molded article is produced through hot extrusion of the magnesium-based alloy powder.