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主要研究了Mn含量对梯度多孔Mg-Mn合金显微组织、物相组成、抗压强度、显微硬度以及耐腐蚀性能的影响。研究结果表明随着Mn含量的增加,梯度多孔Mg-Mn合金孔壁处晶粒烧结的致密化程度提高,晶粒细化,当Mn含量超过2%(质量分数)时,孔壁晶粒烧结的致密化程度略有降低。结合X射线衍射(XRD)仪和能谱(EDS)分析表明当Mn含量为2%时,梯度多孔Mg-Mn合金由单相α-Mg固溶体组成;当Mn含量为3%时,梯度多孔Mg-Mn合金由α-Mg和α-Mn两相组成。随着Mn含量的增加,梯度多孔Mg-Mn合金的抗压强度先增加而后降低,显微硬度持续增加;当Mn含量为2%时,烧结产物的抗压强度为34.1 MPa,显微硬度为HV48.5,分别比梯度多孔Mg合金提高52.2%和36.2%。耐腐蚀性分析表明,添加Mn元素后梯度多孔Mg-Mn合金的腐蚀速率降低,这表明梯度多孔Mg-Mn合金的耐腐蚀性增加。当Mn含量为2%时,梯度多孔Mg-Mn合金试样的腐蚀速率最低,耐腐蚀性能最佳。
The effects of Mn content on the microstructure, phase composition, compressive strength, microhardness and corrosion resistance of gradient porous Mg-Mn alloy were studied. The results show that with the increase of Mn content, the degree of densification of grain sintering at the pore walls of gradient porous Mg-Mn alloy increases and grain refinement occurs. When the Mn content exceeds 2% (mass fraction) Degree of a slight decrease. The results of X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS) show that the gradient porous Mg-Mn alloy is composed of single phase α-Mg solid solution when the Mn content is 2%. When the Mn content is 3% The -Mn alloy consists of two phases, α-Mg and α-Mn. With the increase of Mn content, the compressive strength of gradient porous Mg-Mn alloy firstly increases and then decreases, and the microhardness increases continuously. When the Mn content is 2%, the compressive strength of the sintered product is 34.1 MPa and the microhardness is HV48.5, respectively, than the gradient porous Mg alloy increased by 52.2% and 36.2%. Corrosion resistance analysis shows that the corrosion rate of gradient porous Mg-Mn alloy decreases with the addition of Mn, which indicates that the corrosion resistance of gradient porous Mg-Mn alloy increases. When the content of Mn is 2%, the gradient corrosion rate of the porous Mg-Mn alloy sample is the lowest, and the corrosion resistance is the best.