稀土Yb对Mg-Zn-Zr镁合金组织及性能的影响
Effect of Ytterbium on the Microstructure and Mechanical Properties of the Mg-Zn-Zr Magnesium Alloys
作者: 黄阳斌 , 徐洪辉 :中南大学粉末冶金研究院,湖南 长沙;
关键词: Mg-Zn合金; 镱; 显微组织; 力学性能; Mg-Zn Alloys; Ytterbium; Microstructure; Mechanical Property
摘要:Abstract: Five Mg-Zn-Zr-xYb (x = 0, 0.6, 1.2, 2.4, 4.0) magnesium alloys were prepared by using a special melting method that the pure elements were sealed in tantalum crucibles and melted in a furnace with the temperature program-controlled. The effect of the ytterbium addition in the alloys on their microsructures and mechanical properties was investigated by using the optical microscope and scanning electron microscope with energy dispersive spectrometer. The experimental results indicated that the grain refinement of the alloys is attained after the addition of ytterbium. Ytter-bium is also useful for the purification of grain boundary. The best grain refining effect was achieved in the alloy with the Yb addition of 2.4 wt.%. The EDS analysis suggested that the ytterbium content in the magnesium matrix is negligibly little. The added ytterbium is present almost wholy in the eutectic mixture. After the solution treatment and aging treatment, the hardness of the magnesium alloys increased. The 125˚C aging time for the magnesium alloys without ytterbium to reach the hardness peak is 10 h while those of the Yb-added magnesium alloys are shortened to be about 3 h. The alloy containing 2.4 wt.% Yb has the highest aging hardness peak.
文章引用: 黄阳斌 , 徐洪辉 (2016) 稀土Yb对Mg-Zn-Zr镁合金组织及性能的影响。 材料科学, 6, 65-74. doi: 10.12677/MS.2016.61009
参考文献
[1]
Fridrich, H. and Schuman, S. (2001) Research for a “New Age of Magnesium” in the Automotive Industry. Journal of Materials Processing Technology, 117, 276-281.
http://dx.doi.org/10.1016/S0924-0136(01)00780-4
[2]
Aghion, E., Bronfin, B. and Eliezer, D. (2001) The Role of the Magnesium Industry in Protecting the Environment. Journal of Materials Processing Technology, 117, 381-385.
http://dx.doi.org/10.1016/S0924-0136(01)00779-8
[3] 李杰华. 稀土Gd对Mg-Nd-Zn-Zr镁合金组织和性能的影响[J]. 稀有金属材料与工程, 2008, 37(10): 1751-1755.
[4]
Hono, K., Mendis, C.L., Sasaki, T.T. and Oh-ishi, K. (2010) Towards the Development of Heat-Treatable High- Strength Wrought Mg Alloys. Scripta Materialia, 63, 710-715.
http://dx.doi.org/10.1016/j.scriptamat.2010.01.038
[5]
Mendis, C.L., Oh-ishi, K., Kawamura, Y., Honma, T., Kamado, S. and Hono, K. (2009) Precipitation-Hardenable Mg–2.4Zn–0.1Ag–0.1Ca–0.16Zr (at.%) Wrought Magnesium Alloy. Acta Materialia, 57, 749-760.
http://dx.doi.org/10.1016/j.actamat.2008.10.033
[6]
Du, Y.Z., Qiao, X.G., Zheng, M.Y., Wu, K. and Xu, S.W. (2015) The Microstructure, Texture and Mechanical Properties of Extruded Mg–5.3Zn–0.2Ca–0.5Ce (wt%) Alloy. Materials Science and Engineering: A, 620, 164-171.
http://dx.doi.org/10.1016/j.msea.2014.10.028
[7]
Langelier, B., Nasiri, A.M., Lee, S.Y., Gharghouri, M.A. and Esmaeili, S. (2015) Improving Microstructure and Ductility in the Mg–Zn Alloy System by Combinational Ce–Ca Mi-croalloying. Materials Science and Engineering: A, 620, 76-84.
http://dx.doi.org/10.1016/j.msea.2014.09.116
[8] Kawamura, Y., Hayashi, K., Inoue, A., et al. (2001) Rapidly Solidified Powder Metallurgy Mg97ZnlY2 Alloys with Excellent Tensile Yield Strength above 600 MPa. Materials Transactions, 42, 1172-1176.
[9] 陈长玖. 长周期堆垛有序结构增强高强度Mg-Y-Zn合金的研究[D]: [硕士学位论文]. 太原: 太原理工大学, 2012.
[10]
Yu, W.B., Liu, Z.Y., He, H., Cheng, N.P. and Li, X.L. (2008) Microstructure and Mechanical Properties of ZK60–Yb Magnesium Alloys. Materials Science and Engineering: A, 478, 101-107.
http://dx.doi.org/10.1016/j.msea.2007.09.027