激光熔化镁合金凝固组织及腐蚀行为 |
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引用本文: | 方志浩,马程鹏,管迎春,周伟,郑宏宇. 激光熔化镁合金凝固组织及腐蚀行为[J]. 材料工程, 2017, 0(12): 1-9. DOI: 10.11868/j.issn.1001-4381.2016.000070 |
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作者姓名: | 方志浩 马程鹏 管迎春 周伟 郑宏宇 |
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作者单位: | 1. 北京航空航天大学能源与动力工程学院 ,北京100191;北京航空航天大学机械工程与自动化学院 ,北京100191;2. 北京航空航天大学机械工程与自动化学院 ,北京,100191;3. 北京航空航天大学机械工程与自动化学院 ,北京100191;北京航空航天大学国际交叉研究院,北京100191;南洋理工大学机械宇航学院,新加坡639798;新加坡制造技术研究院,新加坡638075;4. 南洋理工大学机械宇航学院,新加坡,639798;5. 新加坡制造技术研究院,新加坡,638075 |
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基金项目: | 国家重点研发计划增材制造与激光制造重点专项资助,国家重点基础研究发展计划 (973 计划)资助,北京市自然科学基金(面上项目)资助,青年千人计划资助 |
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摘 要: | 采用Nd:YAG毫秒脉冲激光器,在高纯氩气保护下扫描AZ91D镁合金样品,采用X射线衍射仪(XRD),光学显微镜,扫描电镜(SEM),原子力显微镜(AFM)等对处理后镁合金表面形貌、组织、成分进行研究。使用模拟改性体液和质量分数为3.5%的NaCl溶液对实验样品进行腐蚀,观察腐蚀表面并计算材料腐蚀率。结果表明:在相同腐蚀时间下,与未被处理样品相比,激光处理后镁合金由于其显微组织中细化的α-Mg相与β-Mg_(17)Al_(12)相,及选择性气化现象和基体合金化学成分共同导致表面Al元素富集提高了表层的抗腐蚀性能;通过测算激光熔化区枝晶晶胞尺寸与冷却速率的关系得到其凝固方程。
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关 键 词: | 激光加工 镁合金 微观组织 耐蚀性 |
Solidified Structure and Corrosion Behavior of Laser-melt Magnesium Alloy |
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Abstract: | The AZ91D magnesium alloy samples were scanned by millisecond pulse Nd :YAG laser un-der high pure argon protection .The surface morphology ,microstructure and composition of the trea-ted magnesium alloy were studied by X-ray diffraction ,optical microscopy ,scanning electron micros-copy ,atomic force microscopy .In addition ,the corrosion surface which was corroded using simulated body fluid and the mass fraction of 3 .5% NaCl solution was observed and material corrosion rate was calculated .The results show that ,at the same corrosion time ,compared with the untreated samples , the surface corrosion resistance is improved by the enrichment of Al at the irradiated surface by the joint effect of the combination of refined homogeneous microstructure of α-Mg phase and β-Mg17 Al12 phase and the selective vaporization and the chemical composition of base metal in the laser-treated AZ91D alloy ;the solidification equation is obtained by calculating the relation between the size of the dendrite cell and the cooling rate in laser melting zone . |
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Keywords: | laser processing magnesium alloy microstructure corrosion resistance |
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