Magnesium alloy cast material for plastic processing, magnesium alloy member using the same, and manufacturing method thereof

A continuous cast magnesium alloy material for forge processing, of which principal alloy elements are composed of Al, Mn, Zn and Sr wherein Al is 6.2 to 7.6 wt. %;

• Mn is 0.15 to 0.5 wt. %;
• Zn is 0.4 to 0.8 wt. % and the mean crystal grain size of material matrix is 200 .mu.m or less, wherein said continuous cast magnesium alloy material is made by continuous casting.

A magnesium alloy member having good tensile characteristics with the mean crystal grain size of material matrix of 100 .mu.m or less throughout said member, elongation of 10% or more, and tensile strength of 300 MPa or more, after forge processing of a continuous cast material of which principal alloy element are composed of Al, Mn and Zn, wherein Al is 6.2 to 7.6 wt. %;

• Mn is 0.15 to 0.5 wt. %;
• Zn is 0.4 to 0.8 wt. %, wherein said continuous cast material is made by continuous casting.

A magnesium alloy wheel for automobile, which comprises a disk part made of a continuous cast magnesium material and a rim part made of another light metal alloy material, wherein said continuous cast magnesium material is made by continuous casting.

A magnesium alloy continuous cast material for forge processing, of which principal alloy elements are composed of Al, Mn, Zn and CaCN.sub.2 wherein Al is 6.2 to 7.6 wt. %;

• Mn is 0.15 to 0.5 wt. %;
• Zn is 0.4 to 0.8 wt. %;
• CaCN.sub.2 is 0.3 to 0.7 wt. % and the mean crystal grain size of material matrix is 200 .mu.m or less, which alloy has excellent forgeability as represented by an upsetting rate of more than 60% with respect to an upsetting rate after continuous casting.

A magnesium alloy member having tensile characteristics with the mean crystal grain size of material matrix of 100 .mu.m or less throughout said member, elongation of 10% or more, and tensile strength of 300 MPa or more, after forge processing of a cast material of which principal alloy elements are composed of Al, Mn, Zn and CaCN.sub.2 wherein Al is 6.2 to 7.6 wt. %;

• Mn is 0.15 to 0.5 wt. %;
• Zn is 0.4 to 0.8 wt. %;
• CaCN.sub.2 is 0.3 to 0.7 wt. %.

A magnesium alloy member having good tensile characteristics with the mean crystal grain size of material matrix of 100 .mu.m or less throughout said member, elongation of 10% or more, and tensile strength of 300 MPa or more, after forge processing of a continuous cast material, wherein principal alloy elements are Al, Mn, Zn and Sr, where Al is 6.2 to 7.6 wt. %;

• Mn is 0.15 to 0.5 wt. %;
• Zn is 0.4 to 0.8 wt. %;
• Sr is 0.02 to 0.5 wt. %, wherein said continuous cast material is made by continuous casting.

A magnesium alloy wheel for an automobile having good tensile characteristics with the mean crystal grain size of material matrix of 50 .mu.m or less and Charpy impact value after forge processing of a continuous cast material is higher than 50 J/cm.sup.2, wherein principal alloy elements are Al, Mn and Zn, where Al is 6.2 to 7.6 wt. %;

• Mn is 0.15 to 0.5 wt. %;
• Zn is 0.4 to 0.87 wt. %, wherein said continuous cast material is made by continuous casting.

A continuous cast magnesium alloy material for forge processing, of which principal alloy elements are composed of Al, Mn, Zn and CaCN.sub.2 wherein Al is 6.2 to 7.6 wt. %;

• Mn is 0.15 to 0.5 wt. %;
• Zn is 0.4 to 0.8 wt. %;
• CaCN.sub.2 is 0.3 to 0.7 wt. % and the mean crystal grain size of material matrix is 200 .mu.m or less, wherein said continuous cast magnesium alloy material is made by continuous casting.