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Mechanical properties and deformation mechanism in Mg-Gd alloy laminate with dual-heterostructure grain size and texture
International Journal of Plasticity ( IF 9.4 ) Pub Date : 2022-07-02 , DOI: 10.1016/j.ijplas.2022.103371
Shuaishuai Liu , Dabiao Xia , Hong Yang , Guangsheng Huang , Feixiang Yang , Xianhua Chen , Aitao Tang , Bin Jiang , Fusheng Pan

Heterostructures can effectively break the traditional strength-ductility trade-off dilemma. However, how the texture of materials with heterostructure under hetero-deformation induced stress (including back stress and forward stress) influences the activation of the deformation mechanism is still not clear. In this paper, a Mg-1Gd/Mg-13Gd (wt.%) laminate with an alternating distribution of dual-heterostructure grain size and texture, where the coarse-grained (CG) layers presented a bimodal texture along the extrusion direction and the fine-grained (FG) layers showed random texture, exhibited an excellent strength-ductility synergy. Strain delocalization in the Mg-13Gd layer was realized by generating dispersed stable strain bands, which promoted the activation of ductile mechanisms. In the CG layers, the bimodal texture facilitated the activation of pyramidal <c + a> slip to maintain the continuity of strain at the interface. The lower level of geometric compatibility factor at the interface, with its heterogeneous texture, aggravated deformation incompatibility and boosted the back stress. The higher shear stress field at the interface generated by back stress led to the activation of pyramidal <c + a> slip and enhanced the strength of the CG layers. In the FG layers, the forward stress promoted the activation of prismatic <a> and pyramidal <c + a> slips at the interface; they acted together with the abundant basal <a> slips caused by the random texture to improve the ductility of the FG layers. The results of this work will promote the development of heterogeneous theory in textured Mg alloys.



中文翻译:

具有双异质结构晶粒尺寸和织构的Mg-Gd合金层压板的力学性能和变形机制

异质结构可以有效打破传统的强度-延展性权衡困境。然而,异质变形诱导应力(包括背应力和正向应力)下异质结构材料的织构如何影响变形机制的激活仍不清楚。在本文中,Mg-1Gd/Mg-13Gd (wt.%) 层压板具有交替分布的双异质结构晶粒尺寸和织构,其中粗晶 (CG) 层沿挤压方向呈现双峰织构,而细粒(FG)层显示出随机纹理,表现出优异的强度 - 延展性协同作用。Mg-13Gd 层中的应变离域是通过产生分散的稳定应变带来实现的,这促进了延性机制的激活。在 CG 层中,双峰纹理促进了金字塔形<c + a>滑动的激活,以保持界面处应变的连续性。界面几何相容性因子水平较低,织构不均匀,加剧了变形不相容性,增加了背应力。由背应力产生的界面处较高的剪切应力场导致金字塔形<c + a>滑移的激活并增强了CG层的强度。在FG层中,正向应力促进了界面处棱柱形<a>和金字塔形<c + a>滑移的激活;它们与由随机纹理引起的大量基底<a>滑动共同作用,以提高FG层的延展性。这项工作的结果将促进织构镁合金异质理论的发展。c + a> 滑动以保持界面处应变的连续性。界面几何相容性因子水平较低,织构不均匀,加剧了变形不相容性,增加了背应力。由背应力产生的界面处较高的剪切应力场导致金字塔形<c + a>滑移的激活并增强了CG层的强度。在FG层中,正向应力促进了界面处棱柱形<a>和金字塔形<c + a>滑移的激活;它们与由随机纹理引起的大量基底<a>滑动共同作用,以提高FG层的延展性。这项工作的结果将促进织构镁合金异质理论的发展。c + a> 滑动以保持界面处应变的连续性。界面几何相容性因子水平较低,织构不均匀,加剧了变形不相容性,增加了背应力。由背应力产生的界面处较高的剪切应力场导致金字塔形<c + a>滑移的激活并增强了CG层的强度。在FG层中,正向应力促进了界面处棱柱形<a>和金字塔形<c + a>滑移的激活;它们与由随机纹理引起的大量基底<a>滑动共同作用,以提高FG层的延展性。这项工作的结果将促进织构镁合金异质理论的发展。界面几何相容性因子水平较低,织构不均匀,加剧了变形不相容性,增加了背应力。由背应力产生的界面处较高的剪切应力场导致金字塔形<c + a>滑移的激活并增强了CG层的强度。在FG层中,正向应力促进了界面处棱柱形<a>和金字塔形<c + a>滑移的激活;它们与由随机纹理引起的大量基底<a>滑动共同作用,以提高FG层的延展性。这项工作的结果将促进织构镁合金异质理论的发展。界面几何相容性因子水平较低,织构不均匀,加剧了变形不相容性,增加了背应力。由背应力产生的界面处较高的剪切应力场导致金字塔形<c + a>滑移的激活并增强了CG层的强度。在FG层中,正向应力促进了界面处棱柱形<a>和金字塔形<c + a>滑移的激活;它们与由随机纹理引起的大量基底<a>滑动共同作用,以提高FG层的延展性。这项工作的结果将促进织构镁合金异质理论的发展。由背应力产生的界面处较高的剪切应力场导致金字塔形<c + a>滑移的激活并增强了CG层的强度。在FG层中,正向应力促进了界面处棱柱形<a>和金字塔形<c + a>滑移的激活;它们与由随机纹理引起的大量基底<a>滑动共同作用,以提高FG层的延展性。这项工作的结果将促进织构镁合金异质理论的发展。由背应力产生的界面处较高的剪切应力场导致金字塔形<c + a>滑移的激活并增强了CG层的强度。在FG层中,正向应力促进了界面处棱柱形<a>和金字塔形<c + a>滑移的激活;它们与由随机纹理引起的大量基底<a>滑动共同作用,以提高FG层的延展性。这项工作的结果将促进织构镁合金异质理论的发展。它们与由随机纹理引起的大量基底<a>滑动共同作用,以提高FG层的延展性。这项工作的结果将促进织构镁合金异质理论的发展。它们与由随机纹理引起的大量基底<a>滑动共同作用,以提高FG层的延展性。这项工作的结果将促进织构镁合金异质理论的发展。

更新日期:2022-07-02
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