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首页> 外文期刊>Journal of Materials Engineering and Performance >Synergetic Strengthening of Grain Refinement and Texture in Gradient Zircaloy-4 by Surface Mechanical Rolling Treatment
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Synergetic Strengthening of Grain Refinement and Texture in Gradient Zircaloy-4 by Surface Mechanical Rolling Treatment

机译：表面机械滚动处理协同加强梯度锆石-4中晶粒细化和质地

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摘要

A Zircaloy-4 rod was subjected to surface mechanical rolling treatment (SMRT) to form a gradient structure, and the evolution of the resulting sub-grain-boundary property and texture across the gradient structure was characterized using electron backscattered diffraction. Dual-gradient structures in grain size and orientation were formed; the grain size was refined from several microns at the center to approximately 400 nm at the topmost surface. Texture analysis revealed that the c-axis gradually tilted from a random orientation toward the parallel-to-radial direction on the radial-tangential plane. The SMRT-induced formation of the dual-gradient microstructure is attributed to the formation of gradient distributions of stress and strain, which resulted in various deformation mechanisms (twinning and dislocation) being active at different depths. During the SMRT process, twinning and dislocations were activated to refine the grains. When the dual-gradient microstructure formed, twinning was mainly activated at the subsurface near the matrix, whereas dislocations were activated across the entire gradient. The geometrically necessary dislocation density increased with decreasing depth and then slightly decreased near the surface. The synergetic strengthening of the dual-gradient microstructure resulted in a gradient distribution of the microhardness near the surface. Thus, the Zircaloy-4 rod exhibited a good combination of strength and ductility.
机译：对锆瓦罗约4杆进行表面机械轧制处理（SMRT）以形成梯度结构，并且使用电子背散射衍射表征所得的亚粒边界性能和梯度结构的纹理的演变。形成晶粒尺寸和取向的双梯度结构;将晶粒尺寸从中心的几微米精制到最顶部的中心至约400nm。纹理分析显示，C轴在径向切向平面上从随机取向逐渐倾斜地倾斜。 SMRT诱导的双梯度微结构的形成归因于应力和应变梯度分布的形成，导致各种变形机制（孪生和位错）在不同深度处活跃。在SMRT过程中，激活孪生和脱位以改善晶粒。当形成的双梯度微结构形成时，Twinning主要在基质附近的地下激活，而脱位在整个梯度上被激活。几何必要的位错密度随着深度的减小而增加，然后在表面附近略微降低。双梯度微观结构的协同强化导致表面附近的微硬度的梯度分布。因此，锆洛伊-4杆表现出强度和延展性的良好组合。

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