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利用OM、SEM、质量损失测试、电化学测试与拉伸试验研究了挤压温度对Mg-2Zn-0.4Zr-0.6Ce生物镁合金组织与性能的影响。结果表明,热挤压后合金发生动态再结晶,合金的组织均由细小的再结晶晶粒与原始晶粒组成。在470~510℃范围内随着挤压温度的升高,合金再结晶晶粒体积分数逐渐增大,晶粒尺寸变化不明显,合金的腐蚀速率与腐蚀电流密度Icorr先减小后增大,容抗弧半径先增大后减小。挤压温度为490℃时,合金的耐蚀性最好,腐蚀速率为0.9337 mm·a~(-1),腐蚀电流密度为4.67μA·cm~(-2)。由于细晶强化与位错强化作用,热挤压后合金的强度得到提高,随着挤压温度的升高,合金的抗拉强度和伸长率先增大后减小。挤压温度为490℃时,合金的综合力学性能最好,合金的抗拉强度与伸长率分别为259.1 MPa与14.1%。
The effects of extrusion temperature on the microstructure and properties of Mg-2Zn-0.4Zr-0.6Ce biomagnesium alloy were studied by OM, SEM, mass loss test, electrochemical test and tensile test. The results show that the dynamic recrystallization occurs after hot extrusion. The microstructure of the alloy consists of fine recrystallized grains and original grains. In the temperature range of 470-510 ℃, the recrystallization grain size increases with the increase of extrusion temperature, and the grain size does not change obviously. The corrosion rate and corrosion current density Icorr first decrease and then increase, Capacitance arc radius first increased and then decreased. When the extrusion temperature is 490 ℃, the corrosion resistance of the alloy is the best, the corrosion rate is 0.9337 mm · a -1 and the corrosion current density is 4.67 μA · cm -2. Due to the fine grain strengthening and dislocation strengthening, the strength of the alloy after hot extrusion is improved. As the extrusion temperature increases, the tensile strength and elongation of the alloy first increase and then decrease. When the extrusion temperature is 490 ℃, the mechanical properties of the alloy are the best, and the tensile strength and elongation of the alloy are 259.1 MPa and 14.1% respectively.