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通过模铸法制备了Mg-10Gd-6Y-1.6Zn-XMn(X=0.4,0.8,1.2,1.6,2.0,质量分数,%)系列镁合金,研究了挤压比及Mn含量对Mg-10Gd-6Y-1.6Zn-XMn镁合金显微组织及室温力学性能的影响。结果表明:铸态Mg-10Gd-6Y-1.6Zn-XMn合金经热挤压后,合金中的长周期堆垛有序(LPSO)结构由亚稳的18R结构转变为稳定的14H结构。大挤压比能够显著提高合金的室温力学性能,当Mn含量为0.8%时,未时效态合金的抗拉强度达到386 MPa,断后延伸率约为10%。
Mg-10Gd-6Y-1.6Zn-XMn (X = 0.4,0.8,1.2,1.6,2.0, mass fraction,%) series magnesium alloys were prepared by the die casting method. The effect of extrusion ratio and Mn content on the microstructures of Mg-10Gd -6Y-1.6Zn-XMn magnesium alloy microstructure and mechanical properties at room temperature. The results show that the long period stacking ordered (LPSO) structure in the as-cast Mg-10Gd-6Y-1.6Zn-XMn alloy changes from a metastable 18R structure to a stable 14H structure after hot extrusion. Large extrusion ratio can significantly improve the mechanical properties of the alloy at room temperature, when the Mn content of 0.8%, the tensile strength of non-aging alloy reaches 386 MPa, the elongation after fracture of about 10%.