Effects of Mn and Mg Contents on Microstructure and Properties of 5A01 High Magnesium Aluminum Alloy
摘 要
采用铸锭冶金法制备了三种成分的5A01高镁铝合金, 通过显微组织观察、室温拉伸试验、剥落腐蚀试验及阳极极化曲线测试等方法研究了在5A01铝合金成分范围内增加锰和镁含量对其组织及性能的影响。结果表明: 将Al-6.13%Mg-0.48%Mn铝合金中镁含量提高0.5%后, 合金中枝晶数量无明显变化, 锰含量提高0.5%后, 枝晶数量明显减少; 锰或镁含量增加0.5%后, 均可提高合金的强度, 但增加锰含量对合金强度的提高幅度优于镁的; 冷轧后经180 ℃退火2 h, 该铝合金发生了剥落腐蚀, 镁含量提高0.5%后, 合金的剥落腐蚀敏感性提高, 腐蚀电位降低; 增加相同含量的锰, 合金剥落腐蚀敏感性降低, 腐蚀电位升高。
Abstract
Three alloys with high magnesium and aluminum were prepared by ingot metallurgy to study the effects of increase Mn and Mg contents on the microstructure and properties of 5A01 aluminum alloy, which by means of microstructure observation, room temperature tensile test, exfoliation corrosion test and anodic polarization curve test. The results show that the amount of dendrite in the alloy had not obvious change when increase the Mg content in the Al-6.13%Mg-0.48%Mn aluminum alloy by 0.5%, while the amount of dendrite decreased significantly when increase the Mn content by 0.5%. With the increase the Mg or Mn content by 0.5%, the strength of the alloy was improved, while Mn had better effect. After cold rolled and annealed at 180 ℃ for 2 h, exfoliation corrosion occurred for the 5A01 Al alloy. The exfoliation corrosion sensitivity increased and corrosion potential decreased after Mg content increased by 0.5%. Mn content increased by 0.5%, the exfoliation corrosion sensitivity decreased and the corrosion potential increased.
中图分类号 TG146.21
所属栏目
基金项目 国家“十一五”军工配套资助项目(JPPT-115-2-1133)
收稿日期 2010/6/25
修改稿日期 2011/1/11
网络出版日期
作者单位点击查看
备注罗兵辉(1965-), 男, 湖南浏阳人, 教授, 博士。
引用该论文: LUO Bing-hui,LIU Cheng,YANG Lei. Effects of Mn and Mg Contents on Microstructure and Properties of 5A01 High Magnesium Aluminum Alloy[J]. Materials for mechancial engineering, 2011, 35(6): 30~34
罗兵辉,刘成,杨磊. 锰和镁元素含量对5A01高镁铝合金组织及性能的影响[J]. 机械工程材料, 2011, 35(6): 30~34
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【5】罗兵辉, 陈娇, 柏振海, 等.Sc、Zr对Al-Mg-Mn合金再结晶行为及内耗性能的影响[J].材料科学与工艺, 2009, 17(4):496-500.
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【7】JENA A K, LAHIRI D P, RAMACHANDRAN T R. Kine-tics of precipitation in Al-1wt%Mn alloy[J].Journal of Materials Science, 1981, 16(9):2544-2550.
【8】STARIN K M J, ZAHRA A M. β′ and β precipitation in an Al-Mg alloy studied by DSC and TEM[J].Acta Materialia, 1998, 46(10):3381-3397.
【9】JONES R H, BAER D R, DANIELSON M J. Role of Mg in the stress corrosion cracking of an Al-Mg alloy[J].Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 2001, 32(7):1699-1711.
【10】CHANG J C, CHUANG T H. Stress-corrosion cracking susceptibility of the superplastically formed 5083 aluminum alloy in 3.5%NaCl solution[J].Metallurgical and Materials Transaction A: Physical Metallurgy and Materials Science, 1999, 30(12):3191-3199.
【11】尹志民, 方家芳, 黄继武, 等.时效工艺对7A52 铝合金晶间腐蚀和剥蚀行为的影响[J].中南大学学报:自然科学版, 2007, 38(4):618-622.
【12】罗兵辉, 单毅敏, 柏振海.退火温度对淬火后冷轧5083铝合金组织及腐蚀性能的影响[J].中南大学学报:自然科学版, 2007, 38(5):806-810.
【13】宋诗哲, 唐子龙.工业纯铝在3.5%NaCl溶液中的电化学阻抗谱分析[J].中国腐蚀与防护技术, 1996, 16(2):127-132.
【14】JONES R H, VETRANO J S, WINDISCH J. Stress corrosion cracking of Al-Mg and Mg-Al alloys[J].Corrosion, 2004, 60(12):1144-1154.
【15】许刚, 曹楚南, 林海潮, 等.纯铝在NaCl溶液中活化溶解时电化学行为研究[J].腐蚀科学与防护技术, 1998, 10(6):321-326.
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