High strength Al Zn Mg Cu alloys were produced by spray forming process, and compacted by hot extrusion. The results show that the as deposited billets have fine grained microstructure and low porosity. After heat tre...High strength Al Zn Mg Cu alloys were produced by spray forming process, and compacted by hot extrusion. The results show that the as deposited billets have fine grained microstructure and low porosity. After heat treatment, mechanical properties increase greatly: tensile strength up to 754 MPa, yield strength up to 722 MPa, fracture elongation up to 8%, and elastic modulus up to 72 GPa, respectively. [展开更多
应用连续挤压扩展成形方式制造镁合金板材,型腔结构对镁合金这种变形条件敏感的材料影响明显。采用DEFORM-3D软件,针对两种型腔结构,数值模拟了厚度为8 mm,宽度尺寸分别为80,120和160 mm 3种规格的镁板材的连续挤压扩展成形过程,探讨了...应用连续挤压扩展成形方式制造镁合金板材,型腔结构对镁合金这种变形条件敏感的材料影响明显。采用DEFORM-3D软件,针对两种型腔结构,数值模拟了厚度为8 mm,宽度尺寸分别为80,120和160 mm 3种规格的镁板材的连续挤压扩展成形过程,探讨了型腔结构和产品尺寸变化与流动速度的关系。结果表明,增加型腔深度,低速区尺寸增大,高速区流动速度降低,模口处流动速度差减小。随着产品宽度增大,流动速度降低,模口处流速均方差增大,流动的不均匀程度增加。型腔结构和产品尺寸变化对坯料流动速度的影响缘于模壁摩擦力的作用。流动通道短,心部区域受到的摩擦阻力作用小,加大了心部和模壁区域的流动速度差。反之,增加型腔深度,模壁面积增加,摩擦力的作用区域增加,起到均匀流动速度的作用。展开更多
文摘High strength Al Zn Mg Cu alloys were produced by spray forming process, and compacted by hot extrusion. The results show that the as deposited billets have fine grained microstructure and low porosity. After heat treatment, mechanical properties increase greatly: tensile strength up to 754 MPa, yield strength up to 722 MPa, fracture elongation up to 8%, and elastic modulus up to 72 GPa, respectively. [
文摘应用连续挤压扩展成形方式制造镁合金板材,型腔结构对镁合金这种变形条件敏感的材料影响明显。采用DEFORM-3D软件,针对两种型腔结构,数值模拟了厚度为8 mm,宽度尺寸分别为80,120和160 mm 3种规格的镁板材的连续挤压扩展成形过程,探讨了型腔结构和产品尺寸变化与流动速度的关系。结果表明,增加型腔深度,低速区尺寸增大,高速区流动速度降低,模口处流动速度差减小。随着产品宽度增大,流动速度降低,模口处流速均方差增大,流动的不均匀程度增加。型腔结构和产品尺寸变化对坯料流动速度的影响缘于模壁摩擦力的作用。流动通道短,心部区域受到的摩擦阻力作用小,加大了心部和模壁区域的流动速度差。反之,增加型腔深度,模壁面积增加,摩擦力的作用区域增加,起到均匀流动速度的作用。
