AZ31镁合金表面激光Al合金化及性能
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摘要
采用火焰喷涂及激光重熔工艺在AZ31镁合金表面制备Al合金化层,以期改善镁合金的表面性能。采用X射线衍射仪(XRD)、扫描电镜(SEM)等材料表征手段分析了合金化层显微组织结构特征,利用显微硬度计测量合金化层深度方向上的显微硬度,利用MRH3摩擦磨损实验机测试合金化层的耐磨性能。通过阳极极化实验评价了激光合金化组织的腐蚀性能。结果表明,AZ31镁合金激光合金化层的硬度、耐磨性和耐腐蚀性能明显提高,这归因于合金化层中密集分布的Mg2Al3、Mg17Al12等金属间化合物相。
Laser Al alloying of AZ31 magnesium alloy with spraying and laser remelting technology for improvementof its surface performances was investigated.The microstructural features of the alloying layer were characterized by using X ray diffraction(XRD) and scanning electronic microscope(SEM),the mechanical properties were tested by the microhardnessmeasurements and theMRH3 wear tests.Anodic polarization test was applied to evaluate the corrosion performance of alloying layer.The results show that the hardness,wear and corrosion resistance of alloying layers considerably improves compared with the matrix,due to the intermetallic compounds of Mg2Al3、Mg17Al12in alloyed layers.
Laser Al alloying of AZ31 magnesium alloy with spraying and laser remelting technology for improvementof its surface performances was investigated.The microstructural features of the alloying layer were characterized by using X ray diffraction(XRD) and scanning electronic microscope(SEM),the mechanical properties were tested by the microhardnessmeasurements and theMRH3 wear tests.Anodic polarization test was applied to evaluate the corrosion performance of alloying layer.The results show that the hardness,wear and corrosion resistance of alloying layers considerably improves compared with the matrix,due to the intermetallic compounds of Mg2Al3、Mg17Al12in alloyed layers.
引文
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[2]张永忠,张奎,樊建中等.压铸镁合金及其在汽车工业中的应用[J].特种铸造及有色合金,2002,22(114):296-299.
[3]丁文江,付彭怀,彭立明等.先进镁合金材料及其在航空航天领域中的应用[J].航天器环境工程,2011,28(2):103-109.
[4]蒲以明,张志强,杜荣.镁及镁合金表面处理初探[J].铝加工,2002,25(4):32-36.
[5]蒋百灵,张淑芬,吴建国等.镁合金微弧氧化陶瓷层显微缺陷与相组成及耐蚀性[J].中国有色金属学报,2002,12(3):454-457.
[6]叶宏,孙智富,张津等.AZ91D镁合金表面热喷涂陶瓷涂层研究[J].现代制造工程,2004,(11):61-62.
[7]Padmavathi C,Sarin Sundar J K,Joshi S V,et al.Effect of pulsed Nd:YAG laser melting treatment on microstructural and corrosion behaviour ofAZ91C Mg alloy[J].Materials Science and Technology,2006,22(5):583-589.
[8]Huang K,Lin X,Chen C et al.Microstructure and wear behaviour of laser clad Zr-Cu-Ni-Al/TiC composites on AZ91D magnesium alloy[J].Chinese Journal of Lasers,2007,34(4):549-554.
[9]Sorin I,Pierre S,Dominique G.Magnesium alloy laser(Nd YAG)cladding and alloying with side injection of aluminum power[J].Applied Surface Science,2004,225(1-4):124-134.
[10]王存山,高亚丽.镁合金AZ91HP表面激光重熔Al2O3涂层的组织及性能[J].金属学报,2007,43(5):493-496.