Understanding the High Strength and Good Ductility in LPSO-Containing Mg Alloy Using Synchrotron X-ray Diffraction
Understanding the High Strength and Good Ductility in LPSO-Containing Mg Alloy Using Synchrotron X-ray Diffraction
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利用同步加速器 X 射线衍射了解含 LPSO 镁合金的高强度和良好延展性
DOI：
10.1007/s11661-018-4881-z
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发表时间：
2018-08
影响因子：
2.8
通讯作者：
Jiang Haiyan
中科院分区：
文献类型：
--
作者：
Wang Jie;Wang Leyun;Zhu Gaoming;Zhou Bijin;Ying Tao;Zhang Xingmin;Huang Qi;Shen Yao;Zeng Xiaoqin;Jiang Haiyan
含有长周期堆积有序相的镁合金具有优异的力学性能。其潜在机制尚不清楚。本文采用同步辐射X射线衍射技术研究了含有18R型LPSO相的Mg97Y2Zn合金的拉伸变形。从晶格应变测量，发现LPSO相具有与Mg相似的弹性模量。材料屈服后，Mg相中的晶格应变减小，而LPSO相中的晶格应变进一步增加。通过分析不同Mg峰的晶格应变演化，确定基底滑移和形变孪晶是主要的变形机制。这一发现进一步证实了表面滑移痕迹分析，使用电子背散射衍射（EBSD）。对衍射峰展宽的进一步分析表明，在塑性变形过程中位错密度不断增加。基于上述结果，可以得出结论，枝晶间LPSO相表现为直接强化材料的增强相。该材料的高拉伸塑性归因于枝晶间LPSO的存在所造成的弱挤压织构。此外，Mg相内的小LPSO板可以用作位错成核位点，这导致材料中的高加工硬化率。
Mg alloys containing long-period stacking-ordered (LPSO) phases often display excellent mechanical properties. The underlying mechanism is yet unclear. In this work,in situsynchrotron X-ray diffraction was employed to study tensile deformation of a Mg97Y2Zn alloy that contains 18R-type LPSO phase. From lattice strain measurement, it is found that the LPSO phase has a similar elastic modulus as Mg. After material yielding, lattice strain in the Mg phase decreased, while lattice strain in the LPSO phase increased further. By analyzing the lattice strain evolution of different Mg peaks, basal slip and deformation twinning are identified as the dominant deformation mechanisms. This finding is further confirmed by surface slip trace analysis using electron backscattered diffraction (EBSD). Additional analysis of diffraction peak broadening indicates a continuous increase of dislocation density during plastic deformation. Based on the above results, it can be concluded that the interdendritic LPSO phase behaves like a reinforcing phase that directly strengthens the material. The high tensile ductility of the material is attributed to the weak extrusion texture caused by the presence of interdendritic LPSO. In addition, small LPSO plates inside the Mg phase can serve as dislocation nucleation sites, which leads to a high work hardening rate in the material.
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影响因子：
9.4
作者：
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影响因子：
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DOI：
10.1017/cbo9781139207249.009
发表时间：
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期刊：
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影响因子：
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