Magnesium alloy sheet processing method and magnesium alloy sheet

Abstract

A magnesium alloy sheet processing method wherein a magnesium alloy sheet is rolled at a speed of 180 m/min or more. Particularly, a magnesium alloy sheet processing method, wherein the magnesium alloy sheet is rolled at a speed of 450 m/min or more. A magnesium alloy sheet processing method, wherein a rolling tool which is not heated is used. A magnesium alloy sheet processing method, wherein the temperature of the magnesium alloy sheet immediately before the rolling is in the range of 0° C. to 400° C. A magnesium alloy sheet, wherein the sheet has an average crystal grain of 4 μm or less, and does not internally include any unbonded interface in parallel with a direction of rolling. A magnesium alloy sheet, wherein the sheet has an average grain size of 4 μm or less, and has an internal grain boundary formed by a clean grain boundary.

1 . A magnesium alloy sheet processing method wherein a magnesium alloy sheet is rolled at a speed of 180 m/min or more.  
     
     
         2 . A magnesium alloy sheet processing method according to  claim 1 , wherein the magnesium alloy sheet is rolled at a speed of 450 m/min or more.  
     
     
         3 . A magnesium alloy sheet processing method according to  claim 1 , wherein a rolling tool which is not heated is used.  
     
     
         4 . A magnesium alloy sheet processing method according to  claim 1 , wherein the temperature of the magnesium alloy sheet immediately before the rolling is in the range of O° C. to 400° C.  
     
     
         5 . A magnesium alloy sheet processing method according to  claim 1 , wherein the magnesium alloy sheet immediately after the rolling is cooled at a speed of 10° C./sec or more.  
     
     
         6 . A magnesium alloy sheet processing method according to  claim 1 , wherein the rolling is carried out with a rolling reduction of 25%/step or more.  
     
     
         7 . A magnesium alloy sheet processed by the magnesium alloy sheet processing method according to  claim 1 , wherein the sheet includes, as basic blending components, 0.1 to 10.0 weight percent of Al, and 0.1 to 4 weight percent of Zn, and has a tensile strength of 250 MPa or more and an elongation of 20% or more.  
     
     
         8 . A magnesium alloy sheet processed by the magnesium alloy sheet processing method according to  claim 1 , wherein the sheet includes, as basic blending components, 0.1 to 10.0 weight percent of Al, and 0.1 to 4 weight percent of Zn, and has an average grain size of less than 4 μm.  
     
     
         9 . A magnesium alloy sheet, wherein the sheet has an average crystal grain of 4 μm or less, and does not internally include any unbonded interface in parallel with a direction of rolling.  
     
     
         10 . A magnesium alloy sheet, wherein the sheet has an average grain size of 4 μm or less, and has an internal grain boundary formed by a clean grain boundary.  
     
     
         11 . A magnesium alloy sheet according to  claim 9 , wherein the sheet includes, as basic blending components, 0.1 to 10.0 weight percent of Al, and 0.1 to 4 weight percent of Zn.  
     
     
         12 . A magnesium alloy sheet according to  claim 9 , wherein the sheet includes, as basic blending components, 4.0 to 8.0 weight percent of Zn, and 0.3 to 0.8 weight percent of Zr.  
     
     
         13 . A magnesium alloy sheet processed by the magnesium alloy sheet processing method according to  claim 1 , wherein the sheet includes, as basic blending components, 4.0 to 8.0 weight percent of Zn, and 0.3 to 0.8 weight percent of Zr, and has an average grain size of less than 4 μm.  
     
     
         14 . A magnesium alloy sheet according to  claim 10 , wherein the sheet includes, as basic blending components, 0.1 to 10.0 weight percent of Al, and 0.1 to 4 weight percent of Zn.  
     
     
         15 . A magnesium alloy sheet according to  claim 10 , wherein the sheet includes, as basic blending components, 4.0 to 8.0 weight percent of Zn, and 0.3 to 0.8 weight percent of Zr.