Study on Anisotropy of Mechanical Properties of Zr-Sn-Nb Alloy Strip
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摘要: 为探究Zr-Sn-Nb合金带材织构对其不同方向力学性能的影响，采用电子背散射衍射技术（EBSD）和拉伸试验分别对成品退火态Zr-0.85Sn-1Nb-0.3Fe合金带材的织构及不同方向力学性能进行系统分析。结果表明，合金带材中形成了典型的基面双峰织构，导致了力学性能的各向异性。随拉伸加载方向与轧制方向（RD）夹角的增大，带材主要滑移系的Schmid因子呈下降趋势，使得滑移系开启难度增大，屈服强度和屈强比增大，抗拉强度和硬化指数降低，Zr-Sn-Nb合金带材在RD上具有相对较好的冲压成形能力。
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关键词:
- Zr-0.85Sn-1Nb-0.3Fe合金带材 /
- 织构 /
- 力学性能
Abstract: In order to explore the influence of the texture of the Zr-Sn-Nb alloy strip on its mechanical properties in different directions, the texture and mechanical properties in different directions of the finished annealed Zr-0.85Sn-1Nb-0.3Fe alloy strip were systematically analyzed by Electron Backscatter Diffraction (EBSD) and tensile test. The results showed that the typical bimodal basal texture was formed in the alloy strip, leading to the anisotropy of mechanical properties. With the increase of the angle between the loading direction and the RD (Rolling Direction), the Schmid factor of the main slip system in the strip showed a decreasing trend, which increased the opening difficulty of the slip system. Also the yield strength and yield ratio increased, while the tensile strength and work-hardening index decreased. As a result, the Zr-Sn-Nb alloy strip has relatively better stamping formability in the RD.-
Key words:
- Zr-0.85Sn-1Nb-0.3Fe alloy strip /
- Texture /
- Mechanical properties
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图 1 拉伸试样取样方向及尺寸示意图 mm
TD—横向；r—半径
Figure 1. Diagram of Sampling Direction and Size of Tensile Specimen
图 2 Zr-0.85Sn-1Nb-0.3Fe合金带材偏离RD不同角度观察面的取向重构图
Figure 2. Orientation Image of Zr-0.85Sn-1Nb-0.3Fe Alloy Strip Deviating from RD at Different Angles
图 3 Zr-0.85Sn-1Nb-0.3Fe合金带材偏离RD不同角度观察面的晶粒尺寸分布
Figure 3. Grain Size Distribution of Zr-0.85Sn-1Nb-0.3Fe Alloy Strip Deviating from RD at Different Angles
图 4 Zr-0.85Sn-1Nb-0.3Fe合金带材的极图及IPF
Figure 4. Polar Figure and IPF Figure of Zr-0.85Sn-1Nb-0.3Fe Alloy Strip
图 5 Zr-0.85Sn-1Nb-0.3Fe合金带材偏离RD不同角度观察面的再结晶组织
蓝色—完全再结晶；红色—形变基体；黄色—亚结构
Figure 5. Recrystallization Structure of Zr-0.85Sn-1Nb-0.3Fe Alloy Strip Deviating from RD at Different Angles
图 6 Zr-0.85Sn-1Nb-0.3Fe合金带材沿偏离RD不同角度的方向加载时的工程应力应变曲线
Figure 6. Engineering Stress-strain Curves of Zr-0.85Sn-1Nb-0.3Fe Alloy Strip Loaded in Directions Deviating from RD at Different Angles
图 7 Zr-0.85Sn-1Nb-0.3Fe合金带材沿偏离RD不同角度的方向加载时的真实应力应变曲线
Figure 7. True Stress-strain Curves of Zr-0.85Sn-1Nb-0.3Fe Alloy Strip Loaded in Directions Deviating from RD at Different Angles
图 8 Zr-0.85Sn-1Nb-0.3Fe合金带材偏离RD不同角度方向的力学性能
Figure 8. Mechanical Properties of Zr-0.85Sn-1Nb-0.3Fe Alloy Strip Deviating from RD at Different Angles
图 9 不同加载方向上柱面滑移{
$01\bar{1}0 $ }<$\bar{2}110 $ >的Schmid因子分布图Figure 9. Schmid Factor Distribution of Prismatic Slip {
$01\bar{1}0 $ }<$\bar{2}110 $ > in Different Loading Directions
图 10 不同加载方向上锥面滑移{0001}<
$\bar{2}110 $ >的Schmid因子分布图Figure 10. Schmid Factor Distribution of Pyramidal Slip {0001}<
$\bar{2}110 $ > in Different Loading Directions
图 11 不同加载方向上基面滑移{
$01\bar{1}0 $ }<$\bar{2}113 $ >的Schmid因子分布图Figure 11. Schmid Factor Distribution of Basal Slip {
$01\bar{1}0 $ }<$\bar{2}113 $ > in Different Loading Directions表 1 锆合金带材偏离RD不同角度方向上的n和K
Table 1. n and K of Zr-Sn-Nb Alloy Strip Deviating from RD at Different Angles
力学性能参数 0° 30° 45° 60° 90° n 0.123 0.103 0.091 0.074 0.063 K 755.42 701.39 649.12 619.73 596.39 
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