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制备Mg-3Sn-Mn合金型材,研究了连续流变成形工艺条件对制品组织的影响机理。结果表明:当轧辊转速一定而合金浇注温度在690-750℃变化时,随着浇注温度的降低,结晶前沿的成分过冷度增大,合金中心固相率增加,从而使制品边部柱状晶区增大,中心等轴晶区减小,等轴晶区的晶粒平均直径减小。当合金浇注温度一定,二轧辊转速在0.052-0.087 m·s~(-1)变化时,随着轧辊转速的减小凝固界面趋于稳定,合金在辊靴型腔中随剪切时间的增加制品边部柱状晶区减小,中心等轴晶区增大。浇注温度为690℃、轧辊转速为0.052 m·s~(-1)时制备的断面为5 mm×50 mm的镁合金型材,其表面质量和组织良好,制品晶粒平均直径为27μm。
Preparation of Mg-3Sn-Mn alloy profiles, the continuous rheological forming process conditions on the organization of the mechanism. The results show that when the roll speed is constant and the pouring temperature of alloy is varied from 690 ℃ to 750 ℃, as the pouring temperature decreases, the undercooling of the crystallization front increases and the solid fraction of the alloy center increases, The area increases, the center equiaxed zone decreases, and the equiaxed zone decreases the average grain diameter. When the pouring temperature of the alloy is constant and the rotation speed of the second roll changes from 0.052 to 0.087 m · s -1, the solidification interface tends to be stable with the reduction of the roll speed. The increase of the shear stress Columnar edge of the product area to reduce the central equiaxed zone increases. When the pouring temperature is 690 ℃ and the rotating speed of the roller is 0.052 m · s -1, the surface of the magnesium alloy with a cross section of 5 mm × 50 mm has good surface quality and good structure. The average grain diameter of the product is 27 μm.