Effects of La2O3 on AZ91D Magnesium Alloy Laser Cladding Layers by Al-Cu Powders

被引：1

作者：

Sun Q. ^{[1
]}

Li Z. ^{[1
]}

Zhu R. ^{[1
]}

Liu C. ^{[1
]}

机构：

[1] College of Materials Science and Engineering, North University of China, Taiyuan

来源：

Li, Zhiyong | 1633年 / Chinese Mechanical Engineering Society卷 / 28期

关键词：

Al-Cu coating; Laser cladding; Magnesium alloy; Rare earth;

D O I：

10.3969/j.issn.1004-132X.2017.13.019

中图分类号：

学科分类号：

摘要：

Al-Cu coatings with different additions of La2O3 were cladded on AZ91D magnesium alloys using Nd: YAG laser. Surface morphology, microstructure and phase structure of the cladding layers were investigated with the aid of scanning electron microscope, energy disperse spectroscopy and X-ray diffraction technology. The results show that the grain sizes of the coatings may be refined with the additions of La2O3 in Al-Cu powders and the properties of the cladding layers are improved. Intermetallic compounds Mg17La2 and LaAl3 are generated in the cladding layers. Micro-hardness distributions and friction coefficients of the cladding layers were tested by micro-hardness tester and sliding wear testing machine. Al-Cu coatings with the addition of 1.2% La2O3 have the dramatically refined grains and the highest micro-hardness, which leads to the excellent performance of the cladding layers. The average friction coefficients of the cladding layers with La2O3 additions are lower than that without La2O3 additions or magnesium matrix. Obviously, the friction coefficients of cladding layers may be reduced by the additions of La2O3, thus the wear resistance of the cladding layers is improved. © 2017 Chin. Soc. for Elec. Eng.

引用

页码：1633 / 1637

页数：4

共 14 条

[1] Ding W., Science and Technology of Magnesium Alloys, (2007)
[2] Gray J.E., Luan B., Protective Coatings on Magnesium and Its Alloys-A Critical Review, Journal of Alloys & Compounds, 336, 1-2, pp. 88-113, (2002)
[3] Zhang Z., Lin P., Ren L., Wear Resistance of AZ91D Magnesium Alloy Processed by Improved Laser Surface Remelting, Optics & Lasers in Engineering, 55, 7, pp. 237-242, (2014)
[4] Majumdar J.D., Mannai, Mechanical Properties of a Laser-surface-alloyed Magnesium-based Alloy (AZ91) with Nickel, Scripta Materialia, 62, 8, pp. 579-581, (2010)
[5] Cui Z.Q., Yang H.W., Wang W.X., Et al., Laser Cladding Al-Si/Al2O3-TiO2 Composite Coatings on AZ31B Magnesium Alloy, Journal of Wuhan University of Technology-mater, 27, 6, pp. 1042-1047, (2012)
[6] Xu Y., Ji H., Wei Y., Application of Rare Earth to Laser Treatment on Metal Surface, Chinese Rare Earths, 22, 1, pp. 50-54, (2001)
[7] Metallic Materials-Vickers Hardness Test-Part 1: Test Method, (2009)
[8] Zhang G., Wang C., Gao Y., Et al., Effect of Rare Earth La2O3 on the Microstructure of Laser Cladding Ni-based Coatings on 6063Al Alloys, Chinese Journal of Lasers, 41, 11, pp. 47-52, (2014)
[9] Ma Y., Dong S., Xu B., Et al., Effect of CeO2 on Microstructure and Performance of Laser Cladding Ni-based Alloy Coatings, China Surface Engineering, 19, 1, pp. 7-11, (2006)
[10] Ma X., Jin Z., Gao Y., Effect of Rare Earth La2O3 on Microstructure and Tribological Property of Laser Cladding FeAl Based Alloys and TiC Reinforced Composites Coatings, Chinese Journal of Lasers, 1, pp. 271-276, (2010)

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