Strain anisotropy models for refined diffraction line profile analysis in cubic metals
Strain anisotropy models for refined diffraction line profile analysis in cubic metals
复制标题
用于立方金属精细衍射线轮廓分析的应变各向异性模型
DOI：
10.1016/s1003-6326(20)65363-8
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发表时间：
2020
影响因子：
4.5
通讯作者：
Hui Zhang
中科院分区：
文献类型：
--
作者：
Xiang Dai;Fulin Jiang;Jin Liu;Luoyi Wu;Dingfa Fu;Jie Teng;Hui Zhang
本文研究了立方金属（Cu、5383铝合金、FCC奥氏体钢和BCC钢）不同弹性模型的各向异性数值，探讨了应变各向异性的成因。结果表明：弹性模量倒数（1/Ehkl）与取向参数倒数（Γ）的模型图和实验图均存在稳定的交点；在冷加工试样中进一步验证了基于准弹塑性模型的方法校正应变各向异性的有效性。对于基于位错模型的衍射线轮廓分析方法中的重要输入参数，观察到位错的平均衍射对比因子依赖于弹性常数。通过对Γ的线性依赖，我们发现了有趣的交集。在衍射线剖面分析中，常规输入值对给定的弹性常数有明显的依赖性。据此，提出了一种以优化后的交叉口作为输入值的改进方法，在实际应用中可以得到更可靠的结果。
The present work examined the anisotropy magnitudes obtained from different elastic models of cubic metals (Cu, 5383 Al alloy, FCC austenite steel and BCC steel) to explore the origin of strain anisotropy. The results showed that stable intersections were observed from the modeled and experimental plots of the reciprocal elastic modulus (1/Ehkl) and orientation parameter (Γ). The effectiveness of quasi elasto-plastic model based method in correcting strain anisotropy was further verified in cold-worked specimens. For the important input parameters in dislocation model based diffraction line profile analysis methods, the average diffraction contrast factors of dislocations were observed to depend on elastic constants. Interesting intersections were found from linear dependence of on Γ. The conventional input values indicated distinct dependencies on given elastic constants in diffraction line profile analysis. Accordingly, a refined approach was proposed by adopting the optimized intersections as input values, by which more reliable results could be obtained in practical applications.