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<p>Creep anisotropy is considered a vital component during the creep age forming of metal sheet materials, especially for a new-type Al-Li alloy. However, the effect of various microstructures within initial materials has been rarely reported on the creep anisotropy of an Al-Li alloy. This study chose two types of heat-treated T4 and T6 tempers of the 2195 Al-Li alloy for exploring various microstructures-mediated creep anisotropy. Creep testing results show that the T4-treated sample can significantly weaken the anisotropy of creep deformation, reflected in its in-plane anisotropy (IPA) value of creep strain from 60.1 to 3.4%. In contrast, the weak effect of the T6-treated sample is not apparent. The reason for the different changes in creep strain anisotropy is mainly related to the precipitation and distribution of the T<sub>1</sub> phase. This difference indicates that its creep anisotropy strongly depends on different initial microstructures tailored by the different aging treatments for the 2195 Al-Li alloy. In addition, the decrease in IPA in yield strength after creep aging is similar for the different heat-treated samples. This work will provide new insights into the microstructures-mediated creep anisotropy of an Al-Li alloy.</p>

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Initial Microstructure-Mediated Creep Anisotropy of an Al-Li Alloy

  • 期刊论文

  • 发表日期：

    2025年5月14日

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  • Shengmeng Hui,
  • Lihua Zhan,
  • Yongqian Xu,
  • Bolin Ma,
  • Youliang Yang,
  • Chang Zhou,
  • Fei Chen,
  • Dongyao Wang,
  • Hongfei Xi,
  • Jingpeng Feng,
  • Min Xie,
  • Tong Feng

摘要

Creep anisotropy is considered a vital component during the creep age forming of metal sheet materials, especially for a new-type Al-Li alloy. However, the effect of various microstructures within initial materials has been rarely reported on the creep anisotropy of an Al-Li alloy. This study chose two types of heat-treated T4 and T6 tempers of the 2195 Al-Li alloy for exploring various microstructures-mediated creep anisotropy. Creep testing results show that the T4-treated sample can significantly weaken the anisotropy of creep deformation, reflected in its in-plane anisotropy (IPA) value of creep strain from 60.1 to 3.4%. In contrast, the weak effect of the T6-treated sample is not apparent. The reason for the different changes in creep strain anisotropy is mainly related to the precipitation and distribution of the T1 phase. This difference indicates that its creep anisotropy strongly depends on different initial microstructures tailored by the different aging treatments for the 2195 Al-Li alloy. In addition, the decrease in IPA in yield strength after creep aging is similar for the different heat-treated samples. This work will provide new insights into the microstructures-mediated creep anisotropy of an Al-Li alloy.