Effect of Adding Rare Earth Elements Er and Gd on the Corrosion Residual Strength of Magnesium Alloy
Effect of Adding Rare Earth Elements Er and Gd on the Corrosion Residual Strength of Magnesium Alloy
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DOI：
10.1515/phys-2019-0042
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发表时间：
2019-01-01
期刊：
影响因子：
1.9
通讯作者：
Bai, Lei
中科院分区：
文献类型：
--
作者：
Yang, Miao;Liu, Xiaobo;Bai, Lei
采用XRD、SEM、EDS、失重试验、电化学测试和拉伸试验等方法，研究了稀土Gd和Er单独及复合添加对铸态AM 50镁合金耐蚀性和残余强度的影响。XRD和SEM结果表明，稀土Er和Gd的加入使合金组织中出现了Al 3Er、Al 2Gd 3和Al-Mn-Gd（Er）相。失重试验和Tafel曲线结果表明，改性后的复合稀土提高了耐蚀性。腐蚀坑引起的应力集中是腐蚀后拉伸试样断裂的直接原因。复合稀土改性试样的腐蚀残余强度优于单一稀土改性试样。断口分析表明，稀土元素的加入并没有改变合金的断裂机制，断口仍为解理断裂。
The effects of the single and compound addition of rare earth Gd and Er on corrosion resistance and residual strength of as-cast AM50 magnesium alloy were studied using XRD, SEM, EDS, the weightlessness test, electrochemistry method, and tensile test. The results of XRD and SEM showed that Al3Er, Al2Gd3, and Al-Mn-Gd(Er) phases appeared in the alloy structure after the addition of rare earth Er and Gd. The results from the weightlessness test and Tafel curves show that the corrosion resistance of the modified composite rare earth was improved. Stress concentration caused by a corrosion pit is the direct cause of the tensile samples after corrosion. The corrosion residual strength of modified composite rare earth specimens is better than that of modified single rare earth samples. Fracture analysis indicates that the addition of rare earth elements did not change the fracture mechanism of the alloy, and the fracture was still the cleavage fracture.