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Volume 30 Issue 11
Nov.  2023
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文章导航 >  矿物冶金与材料学报（英文）  > 2023  >  30(11): 2212-2223
Yuji Bai, Zhixiu Wang, Bo Jiang, Mengqi Li, Cong Zhu, Xiaotong Gu, and Hai Li, Anisotropy of mechanical properties of 2297-T87 Al–Li alloy thick plates, Int. J. Miner. Metall. Mater., 30(2023), No. 11, pp. 2212-2223. https://doi.org/10.1007/s12613-023-2652-3
Cite this article as:
Yuji Bai, Zhixiu Wang, Bo Jiang, Mengqi Li, Cong Zhu, Xiaotong Gu, and Hai Li, Anisotropy of mechanical properties of 2297-T87 Al–Li alloy thick plates, Int. J. Miner. Metall. Mater., 30(2023), No. 11, pp. 2212-2223. https://doi.org/10.1007/s12613-023-2652-3
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研究论文

2297-T87铝锂合金厚板力学性能的各向异性

  • 1)

    常州大学材料科学与工程学院, 常州 213164, 中国

  • 2)

    常州大学 江苏省材料表面科学与技术重点实验室, 常州 213164, 中国


  • 通讯作者:

    李海    E-mail: Lehigh_73@163.com

文章亮点

  • (1) 系统地研究了晶粒形貌、晶体织构、第二相粒子等对2297-T87铝锂合金厚板拉伸性能各向异性的影响规律
  • (2) 进一步明确2297-T87铝锂合金厚板力学性能各向异性的影响因素
  • (3) 总结并提出了晶粒形貌是影响厚板拉伸性能各向异性的主要因素
  • 对于铝锂合金厚板，其强度、韧性和疲劳裂纹扩展抗力等方面呈现出一定程度的各向异性和厚度方向的不均匀性，厚板力学性能各向异性给合金的使用带来许多局限，在工程设计时只能以性能较低方向作为设计依据，2297铝锂合金是第三代铝锂合金，以厚板的形式广泛应用于飞机和航空航天结构部件，为进一步明确2297-T87铝锂合金厚板力学性能各向异性的影响因素，本文通过拉伸试验、光学显微镜（OM）、X射线衍射（XRD）、扫描电子显微镜（SEM）、能谱仪（EDS）和透射电子显微镜（TEM）分析了2297-T87铝锂合金厚板在不同厚度位置和不同方向的拉伸性能。结果表明，合金的极限抗拉强度（UTS）和屈服强度（YS）从1/8T位置到1/2T位置先降低后增加，而断后伸长率（Ef）逐渐降低，在相同厚度位置沿轧制方向（RD）的值高于沿横向（TD）的值。从合金的1/8T位置到3/8T位置，沿TD的UTS和YS值高于沿RD的UTS值和YS值。在合金的1/2T位置，沿RD的UTS、YS和Ef最高，而沿法线方向（ND）的UTS、YS和Ef最低。微观结构观察进一步表明，拉伸性能的各向异性与晶粒形貌、晶体织构、第二相粒子和Li原子偏聚有关，晶粒形貌是厚板同一厚度位置拉伸性能各向异性的主要影响因素。
    • Research Article

    Anisotropy of mechanical properties of 2297-T87 Al–Li alloy thick plates

    + Author Affiliations
      Abstract
    • The tensile properties of 2297-T87 Al–Li alloy thick plates at different thickness position and in different direction were analyzed via tensile testing, optical microscopy (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), and transmission electron microscopy (TEM). Results indicated that the ultimate tensile strength (UTS) and yield strength (YS) of the alloy decreased firstly and then increased from the 1/8T position to the 1/2T position, whereas elongation to failure (Ef) decreased gradually such that its value along the rolling direction (RD) was higher than those along the transverse direction (TD) at the same thickness position. From the 1/8T position to the 3/8T position of the alloy, the UTS and YS along the TD were higher than those along the RD. At the 1/2T position of the alloy, the UTS, YS, and Ef along the RD were the highest, whereas those along the normal direction (ND) were the lowest. Microstructural observations further revealed that the anisotropy of tensile properties was related to grain morphology, crystal texture, second-phase particles, and Li atom segregation.
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