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铸态和锻造态Mg-5Y-7Gd-1Nd-0.5Zr合金腐蚀行为对比研究
Alternative TitleComparative Study on Corrosion Behavior of Cast and Forged Mg-5Y-7Gd-1Nd-0.5Zr Alloys
刘金辉; 宋影伟; 单大勇; 韩恩厚
2018
Source Publication金属学报
ISSN0412-1961
Volume54.0Issue:008Pages:1141-1149
Abstract采用SEM、XRD和EDS等手段观察对比了铸态和锻造态稀土镁合金Mg-5Y-7Gd-1Nd-0.5Zr(EW75)的显微组织,分析了2种状态合金中的相组成及第二相的化学成分,采用腐蚀形貌观察、失重率和电化学测试对比了2个样品的耐蚀性。结果表明,铸态EW75合金中晶粒较大,大尺寸的骨骼状第二相沿晶界分布;锻造态EW75合金中晶粒较小,细小的颗粒状第二相弥散分布在晶界上。与铸态EW75合金相比,锻造态EW75合金中的微电偶腐蚀较弱,表面膜更均匀致密,耐蚀性更好。
Other AbstractMagnesium and its alloys have become increasingly attractive in the automotive, 3 C products and aerospace industries because of their advantages such as low density and high specific strength. In recent years, rare earth-Mg alloys have attracted much attention due to their high mechanical properties at room and elevated temperatures. Adjusting the microstructures by deformation treatment is a common method to improve the mechanical properties of Mg alloys. The microstructure especially the size, volume fraction and distribution of second phases in rare earth-Mg alloys will be changed during deformation treatment, which has a great effect on the corrosion resistance of Mg alloys. However, the studies on the effect of deformation treatment on the corrosion resistance of rare earth-Mg alloys are far away from sufficient. In this work, the corrosion behavior of cast and forged Mg-5 Y-7 Gd-1 Nd-0.5 Zr(EW75) alloys were studied by using SEM, XRD, mass loss measurements and electrochemical tests. The results indicate that the second phases are distributed along the grain boundaries of cast and forged EW75 alloys. Meanwhile, the second phases in forged EW75 alloy are finer and lower volume fraction than that in cast EW75 alloy. The micro-galvanic corrosion of the forged EW75 alloy is weaker in comparison with the cast EW75 alloy owing to the smaller size and lower volume fraction of second phases as well more compact surface film, resulting in the better corrosion resistance.
Keyword镁合金 铸态 锻造态 第二相 表面膜 微电偶腐蚀
Indexed ByCSCD
Language中文
CSCD IDCSCD:6291296
Citation statistics
Cited Times:4[CSCD]   [CSCD Record]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/145796
Collection中国科学院金属研究所
Affiliation中国科学院金属研究所
Recommended Citation
GB/T 7714
刘金辉,宋影伟,单大勇,等. 铸态和锻造态Mg-5Y-7Gd-1Nd-0.5Zr合金腐蚀行为对比研究[J]. 金属学报,2018,54.0(008):1141-1149.
APA 刘金辉,宋影伟,单大勇,&韩恩厚.(2018).铸态和锻造态Mg-5Y-7Gd-1Nd-0.5Zr合金腐蚀行为对比研究.金属学报,54.0(008),1141-1149.
MLA 刘金辉,et al."铸态和锻造态Mg-5Y-7Gd-1Nd-0.5Zr合金腐蚀行为对比研究".金属学报 54.0.008(2018):1141-1149.
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