Effects of microstructure on tensile properties of AA2050-T84 Al-Li alloy
Effects of microstructure on tensile properties of AA2050-T84 Al-Li alloy
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DOI：
10.1016/s1003-6326(21)65571-1
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发表时间：
2021-06-09
影响因子：
4.5
通讯作者：
Zhang, Rui-feng
中科院分区：
文献类型：
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作者：
Lu, Ding-ding;Li, Jin-feng;Zhang, Rui-feng
从微观组织的角度研究了80 mm厚（t）2050铝锂合金厚板在150 ℃时效后组织演变对拉伸性能的影响。利用扫描电镜、光学显微镜、透射电镜和X射线衍射仪对该合金的表层（t/6）、中间层（t/3）和中心层（t/2）进行了分析。结果表明，晶界上的第二相、析出相和织构随厚度位置的不同而变化。从欠时效状态到峰时效状态，析出强化对合金沿着轧制方向的影响大于横向，但对各向异性的影响不明显。较强的β纤维轧制织构和晶界相导致的较高的泰勒因子（Al）值是导致沿轧制方向沿着t/2位置处强度最高的主要原因。M值在沿横向沿着的不同厚度层处具有有限的变化，这导致相同的拉伸强度。
The effect of microstructure evolution on the tensile properties of 2050 Al-Li alloy thick plate aged at 150 degrees C with 80 mm in thickness (t) was studied from a microstructural perspective. Scanning electron microscope, optical microscope, transmission electron microscope and X-ray diffractometer were used to explore the surface (t/6), interlayer (t/3) and center (t/2) thickness layer of this alloy. Results show that the secondary phases on grain boundaries, precipitates and textures vary depending on the thickness location. The precipitation strengthening has a stronger influence on the alloy along the rolling direction than the transverse direction from the under-aged to the peak-aging condition; however, its effect on the anisotropy is insignificant. The higher Taylor factor (Al) value caused by stronger beta fiber rolling textures and the intergranular phases is the main reason that leads to the highest strength at the t/2 position along the rolling direction. The M-value has a limited change at different thickness layers along the transverse direction, which causes the same tensile strength.