Magnesium alloy sheet

Abstract

The invention offers a magnesium alloy sheet having excellent warm plastic formability, a production method thereof, and a formed body produced by performing warm plastic forming on this sheet. The magnesium alloy sheet is produced by giving a predetermined strain to a rolled sheet RS that is not subjected to a heat treatment aiming at recrystallization. The sheet is not subjected to the foregoing heat treatment even after the giving of a strain. The strain is given through the process described below. A rolled sheet RS is heated in a heating furnace 10. The heated rolled sheet RS is passed between rollers 21 to give bending to the rolled sheet RS. The giving of a strain is performed such that the strain-given sheet has a half peak width of 0.20 deg or more and 0.59 deg or less in a (0004) diffraction peak in monochromatic X-ray diffraction. The alloy sheet exhibits high plastic deformability by forming continuous recrystallization during warm plastic forming through the use of the remaining strain.

1 - 18 . (canceled) 
     
     
         19 . A method of producing a magnesium alloy sheet, the method producing a sheet comprising magnesium-based alloy;
 the method comprising the steps of:   (a) rolling a material comprising the magnesium-based alloy; and   (b) giving a strain to a sheet produced in the step of rolling a material, the sheet being under a heated condition;   wherein:   (c) the giving of a strain is performed such that the half peak width in a (0004) diffraction peak becomes 0.20 deg or more and 0.59 deg or less in a monochromatic X-ray diffraction conducted on the sheet after the strain is given; and   (d) a heat treatment aiming at recrystallization is not performed before and after the step of giving a strain.   
     
     
         20 . The method of producing a magnesium alloy sheet as defined by  claim 19 , wherein the giving of a strain is performed by passing the sheet heated at 100° C. or more and 250° C. or less between rollers heated at 150° C. or more and 300° C. or less.