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Effects of interrupted ageing and asymmetric rolling on microstructures, mechanical properties, and intergranular corrosion behavior of Al-Mg-Si-Zn alloy

断续时效和非对称轧制对Al-Mg-Si-Zn 合金组织、 力学性能和晶间腐蚀行为的影响

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Abstract

Effects of interrupted ageing (T6I6) and asymmetric rolling on microstructures, mechanical properties, and intergranular corrosion (IGC) behaviors of Al-Mg-Si-Zn alloy were investigated. Results showed that the T6 alloy has the lowest strength and the worst IGC resistance, while the T6I6 alloy has higher strength and better IGC resistance. What’s more, the alloy treated by pre-rolling deformation has higher strength and better IGC resistance; and the alloy treated by the pre-asymmetry rolling achieves the highest strength, the best IGC resistance and lower elongation. The mechanical properties depend on microstructures such as the grain size, texture, dislocation density and precipitation, the grain boundary misorientation and grain boundary microstructure are responsible for the IGC resistance.

摘要

研究了断续时效(T6I6)和非对称轧制对Al-Mg-Si-Zn合金组织、 力学性能和晶间腐蚀(IGC)行为的影响. 结果表明, T6合金具有最低的强度和最差的IGC抗性, 而T6I6合金具有较高的强度和较好的IGC抗性. 另外, 引入预轧制变形处理后的合金具有更高的强度和更好的抗IGC性能; 经不对称预轧制处理的合金强度最高, 抗IGC性能最好, 伸长率较低. 力学性能取决于微观组织的差异性, 如晶粒尺寸、 织构、 位错密度和沉淀析出相; 晶界取向差和晶界微观结构是影响IGC抗性的主要原因.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Central South University, Changsha, 410083, China

    Ai-qin Tian  (田爱琴) & Yun-lai Deng  (邓运来)

  2. National Engineering Research Center for High-speed EMU, CRRC Qingdao Sifang Co., Ltd., Qingdao, 266111, China

    Ai-qin Tian  (田爱琴) & Lin Sun  (孙琳)

  3. Light Alloy Research Institute, Central South University, Changsha, 410083, China

    Xue-hong Xu  (许雪红)

Authors
  1. Ai-qin Tian  (田爱琴)
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  2. Xue-hong Xu  (许雪红)
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  3. Lin Sun  (孙琳)
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  4. Yun-lai Deng  (邓运来)
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Contributions

TIAN Ai-qin’s contributions are formal analysis, investigation, writing original draft, software and data curation. DENG Yun-lai’s contributions are conceptualization, funding acquisition and project administration. XU Xuehong’s contributions are formal analysis and supervision. SUN Lin’s contributions are project administration and resources.

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Correspondence to Yun-lai Deng  (邓运来).

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TIAN Ai-qin, XU Xue-hong, SUN Lin and DENG Yun-lai declare that they have no conflict of interest.

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Foundation item: Project(TC190H3ZV/2) supported by the National Building Project of Application Demonstration Platform on New Materials Products, China

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Tian, Aq., Xu, Xh., Sun, L. et al. Effects of interrupted ageing and asymmetric rolling on microstructures, mechanical properties, and intergranular corrosion behavior of Al-Mg-Si-Zn alloy. J. Cent. South Univ. 29, 821–835 (2022). https://doi.org/10.1007/s11771-022-4967-z

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