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投稿时间:2022-05-25 修订日期:2022-06-17
投稿时间:2022-05-25 修订日期:2022-06-17
中文摘要: 5083是Al-Mg系的主要铝合金,其耐腐蚀性能、焊接性能和加工性能好,中等强度,在交通、能源、航海、通讯等领域应用广泛。5083铝合金的主要合金元素Mg、Mn的成分范围较宽,性能波动较大,因此,有必要细化Mg、Mn成分范围以优化和稳定5083合金的性能。本文设计了不同Mg、Mn含量的5083铝合金,采用室温拉伸、硬度测试和剥落腐蚀等实验,研究了Mg、Mn含量变化对5083显微组织、力学性能和耐腐蚀性能的影响,得到了最优的成份。当Mg含量在4.3~4.4 wt.%之间,5083的力学性能和耐腐蚀性能较高。Mn含量在0.7~0.8 wt.%之间,5083力学性能较高;而当Mn含量在0.5~0.6 wt.%之间时,5083剥落腐蚀程度较低。实验室条件下得到力学性能和耐腐蚀性能优良的5083铝合金的Mg含量为4.38 wt.%,Mn含量为0.61 wt.%,该成分合金退火状态下的抗拉强度为209.1 MPa,硬度为87 HV,断后延伸率为16.04%,剥落腐蚀等级为PA级。Mg在5083合金中能形成Mg2Al3相,复合相Al-Mg-Cr、Al-Mg-Mn-Fe为脆硬相,会降低5083合金塑性和韧性。Mn在5083中能形成AlMn0.75Fe2.25、Fe19Mn等相,Al-Mg-Mn-Fe、Al-Mn-Fe-Si、Al-Mn-Fe复合相与Al基体间的界面为剥落腐蚀的主要根源。
Abstract:5083, as the main brand of Al-Mg aluminum alloy, has good corrosion resistance, welding performance, processing performance and medium strength. It is widely used in transportation, energy, navigation and communication fields. The wide ranges of the contents of Mg、Mn lead to large performance fluctuation. Therefore, narrow range of compositions of Mg, Mn can optimize and stabilize the properties of 5083 alloy. In this research, 5083 aluminum alloy with different Mg and Mn contents was designed. The effects of Mg and Mn contents on the microstructure, mechanical property and corrosion resistance were studied by tensile test, hardness test and exfoliation corrosion test, and the optimal composition was obtained. When Mg content is 4.3~4.4 wt.%, 5083 alloy has high mechanical properties and corrosion resistance. When the Mn content is about 0.7~0.8 wt.%, 5083 alloy has high mechanical properties. When the Mn content is 0.5~0.6 wt.%, the exfoliation corrosion of 5083 alloy is low. According to the scope of the national standard, under laboratory conditions, the optimized 5083 alloy’s composition was obtained with excellent mechanical properties and corrosion resistance. Its Mg content is 4.38 wt.%, and Mn content is 0.61 wt.%. After homogenizing annealing, the tensile strength, the hardness and the elongation of the alloy are209.1 MPa, 87 HV and 16.0%, respectively. And the exfoliation corrosion grade is PA. Mg can form Mg2Al3 in 5083 alloy. The composite phases Al-Mg-Cr and Al-Mg-Mn-Fe are brittle and hard phases, which will reduce the plasticity and toughness of 5083 alloy. Mn can form AlMn0.75Fe2.25 and Fe19Mn in 5083 alloy. The interface between Al-Mg-Mn-Fe, Al-Mn-Fe-Si, Al-Mn-Fe composite phases and Al matrix becomes the origin of exfoliation corrosion.
文章编号: 中图分类号:TB31 文献标志码:
基金项目:广西大学“大学生创新创业训练计划”资助项目(202110593350),南宁市科技开发项目(20201045),广西自然科学基金项目(2018GXNSFAA050048)
引用文本:
庞凌志,陆泽鹏,苏天,邱远辉,唐海翔,韦宗繁,赵艳君.Mg、Mn成分优化对5083铝合金组织和性能的影响[J].有色金属工程,2023,(1):.
庞凌志,陆泽鹏,苏天,邱远辉,唐海翔,韦宗繁,赵艳君.Mg、Mn成分优化对5083铝合金组织和性能的影响[J].有色金属工程,2023,(1):.