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稀土镧对Al-0.6Mg-0.7Si-0.2Mn汽车板材机械及腐蚀性能的影响
作者:
作者单位:

1.东北大学材料电磁加工教育部重点实验室 沈阳;2.辽宁忠旺集团研究院 辽阳

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中图分类号:

TG146.2

基金项目:

国家重点研发计划新能源汽车专项“轻量化纯电动轿车集成开发技术项目”(项目号2016YFB0300901),辽宁省重点研发计划(项目号2020JH2/10700003)


Effects of rare earth lanthanum on mechanical and Corrosion properties of Al-0.6mg-0.7SI-0.2Mn Automotive sheet metal
Author:
Affiliation:

1.Key Laboratory of Electromagnetic Processing of Materials,Ministry of Education,Northeastern University;2.Liaoning Zhongwang Group Co,Ltd

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    摘要:

    采用SEM、OM、拉伸试验(常温/高温)、弯曲试验和晶间腐蚀试验等测试方法,对添加不同含量稀土元素镧的Al-Mg-Si-Mn合金组织、机械性能及耐腐蚀性能等进行研究,分析稀土元素镧对合金机械和腐蚀性能的影响。结果表明,随La元素的添加,合金的铸态组织逐渐细化,第二相形貌得到了改善,同时减薄了该合金型材粗晶区厚度,提高了Al-Mg-Si-Mn合金的机械性能和耐腐蚀性能。当La添加量为0.2 wt.%时,晶粒细化效果最好,型材粗晶区最薄;La含量大于0.2 wt.%时,过量的La形成的初生相与合金晶粒细化剂中的Ti相互作用,减少了异质形核核心的数量,导致晶粒粗化现象,恶化合金的机械性能和耐腐蚀性能。

    Abstract:

    The microstructure, mechanical properties and corrosion resistance of Al-Mg-Si-Mn alloy with different contents of rare earth element La were studied by SEM, OM, tensile test (normal temperature/high temperature), bending test and intergranular corrosion test, and the effects of rare earth element La on the mechanical and corrosion properties of the alloy were analyzed. The results show that with the addition of La element, the as-cast microstructure of the alloy is gradually refined, the morphology of the second phase is improved, the thickness of the coarse grain zone of the profiles is reduced, and the mechanical properties and corrosion resistance of Al-Mg-Si-Mn alloy are improved. When La content is 0.2 wt. %, the grain refinement effect is the best, and the coarse grain zone is the thinest. When La content is greater than 0.2wt. %, the primary phase formed by excessive La interacts with the grain refiner Ti in the alloy, which reduces the number of heterogeneous nucleation cores, leads to grain coarsening phenomenon, and degrades the mechanical properties and corrosion resistance of the alloy.

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孙 巍,张 宇,佟伟平,张 辉,李鹏伟,王向杰,吴 楠,谢方亮.稀土镧对Al-0.6Mg-0.7Si-0.2Mn汽车板材机械及腐蚀性能的影响[J].稀有金属材料与工程,2021,50(12):4493~4501.[Sun Wei, Zang Yu, Tong Weiping, Zhang Hui, Li Pengwei, Wang Xiangjie, Wu Nan, Xie Fangliang. Effects of rare earth lanthanum on mechanical and Corrosion properties of Al-0.6mg-0.7SI-0.2Mn Automotive sheet metal[J]. Rare Metal Materials and Engineering,2021,50(12):4493~4501.]
DOI:10.12442/j. issn.1002-185X.20200947

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历史
  • 收稿日期:2020-12-10
  • 最后修改日期:2021-01-21
  • 录用日期:2021-02-04
  • 在线发布日期: 2022-01-09
  • 出版日期: 2021-12-24