微量Y对Mg–2Zn–0.1Mn–0.3Ca–<i>x</i>Y生物镁合金显微组织、力学性能及腐蚀行为的影响

祁明凡; 魏亮瑜; 徐玉召; 王瑾; 刘爱森; 郝冰; 王继成

doi:10.1007/s12613-021-2327-x

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Mingfan Qi, Liangyu Wei, Yuzhao Xu, Jin Wang, Aisen Liu, Bing Hao, and Jicheng Wang, Effect of trace yttrium on the microstructure, mechanical property and corrosion behavior of homogenized Mg–2Zn–0.1Mn–0.3Ca–xY biological magnesium alloy, Int. J. Miner. Metall. Mater., 29(2022), No. 9, pp.1746-1754. https://dx.doi.org/10.1007/s12613-021-2327-x

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微量Y对Mg–2Zn–0.1Mn–0.3Ca–xY生物镁合金显微组织、力学性能及腐蚀行为的影响

摘要: 研究了添加微量Y元素对Mg–2Zn–0.3Ca–0.1Mn–xY(x = 0，0.1，0.2，0.3)生物镁合金显微组织、力学性能和耐蚀性能的影响。结果表明，当Y含量从0wt%增加到0.3wt%时，晶粒尺寸从310 μm下降至144 μm，第二相体积分数从0.4%增长至6.0%，合金的屈服强度不断提高，抗拉强度和伸长率均先降低后升高。当Y元素含量提高到0.3wt%时，合金中开始析出Mg₃Zn₆Y相，且合金具有最优异的力学性能，其抗拉强度、屈服强度和伸长率分别为119 MPa、69 MPa和9.1%。另外，Y含量为0.3wt%时，Mg–2Zn–0.3Ca–0.1Mn–xY合金在模拟体液中表现出最优耐蚀性能。力学性能和耐蚀性能的提高主要归功于晶粒细化和析出的Mg₃Zn₆Y相。

Effect of trace yttrium on the microstructure, mechanical property and corrosion behavior of homogenized Mg–2Zn–0.1Mn–0.3Ca–xY biological magnesium alloy

Abstract: The effects of trace yttrium (Y) element on the microstructure, mechanical properties, and corrosion resistance of Mg–2Zn–0.1Mn–0.3Ca–xY (x = 0, 0.1, 0.2, 0.3) biological magnesium alloys are investigated. Results show that grain size decreases from 310 to 144 μm when Y content increases from 0wt% to 0.3wt%. At the same time, volume fraction of the second phase increases from 0.4% to 6.0%, yield strength of the alloy continues to increase, and ultimate tensile strength and elongation decrease initially and then increase. When the Y content increases to 0.3wt%, Mg₃Zn₆Y phase begins to precipitate in the alloy; thus, the alloy exhibits the most excellent mechanical property. At this time, its ultimate tensile strength, yield strength, and elongation are 119 MPa, 69 MPa, and 9.1%, respectively. In addition, when the Y content is 0.3wt%, the alloy shows the best corrosion resistance in the simulated body fluid (SBF). This investigation has revealed that the improvement of mechanical properties and corrosion resistance is mainly attributed to the grain refinement and the precipitated Mg₃Zn₆Y phase.

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