选用表面机械研磨技术(SMAT)处理密排六方结构Zr-4合金的表面,实现Zr-4表面纳米化,并利用X射线衍射(XRD)对比分析不同时间SMAT处理Zr-4合金表面平均晶粒尺寸.SMAT处理15 min时Zr-4合金表面平均晶粒尺寸最小,约为20 nm.利用光学显微镜(OM)、透射电镜(TEM)、高分辨透射电镜(HRTEM)对其纳米化表层结构进行表征,并研究了其表面纳米化机制.
A nanostructured surface layer was induced on the surface of Zr-4 alloy with typical hcp structure by the method of surface mechanical attrition treatment (SMAT). XRD was applied to identify the average surface grain size of specimens processed for different duration. The results show that the minimum average grain size was about 20 nm for 15 min SMAT. Optical microsco(OM), transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HREM) were adopted to observe the microstructure of nanocrystallized surface layer, and the grain refinement mechanism of Zr-4 was studied.
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