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为了改善铸态Mg-Nd-Zn-Zr生物镁合金的力学性能,对其进行了多向锻造变形。利用光学显微镜、扫描电子显微镜、单向拉伸等手段研究了不同变形温度及不同道次对合金组织及力学性能的影响。结果表明,该合金多向锻的组织演变分为两个阶段,当温度较低且累积变形量较小时,其强韧化机制主要为变形过程中形成的合理锻造流线。试样经过450℃三道次变形后,其伸长率达到了0.271,抗拉强度达到了221 MPa,较铸态时的力学性能显著提高。
In order to improve the mechanical properties of as-cast Mg-Nd-Zn-Zr bio-magnesium alloy, multi-directional forging deformation was carried out. The effects of different deformation temperatures and different passes on the microstructure and mechanical properties of the alloy were studied by means of optical microscope, scanning electron microscope and uniaxial stretching. The results show that the microstructure evolution of the forging is divided into two stages. When the temperature is low and the cumulative deformation is small, the mechanism of strengthening and toughening is mainly the forging flow line formed during deformation. After three times of deformation at 450 ℃, the elongation of the sample reached 0.271 and the tensile strength reached 221 MPa, which improved the mechanical properties significantly.