Zr-4合金表面变形纳米结构TEM研究

Transmission Electron Microscopy Observations on Surface Nanocrystallization of Zircaloy-4

摘要:

利用透射电镜对Zr-4合金表面进行高能喷丸处理所致纳米结构的微观组织演变特征进行了研究。结果表明，经过喷丸处理变形后，Zr-4 合金表面形成一层平均晶粒尺寸为几纳米至十几纳米的致密纳米层，随着离表面距离的增加，晶粒尺寸也不断增加。通过对Zr-4 合金的变形行为以及微观结构组织演变的观察和分析，探讨了纳米晶的形成机制

Abstract:

A nanocrystalline surface layer was fabricated on a pure zircaloy-4 plate by using the high-speed shot peening (HSSP) technique. The microstructural evolution of the zircaloy-4 was characterized by using X-ray diffraction, and transmission electron microscopy(TEM). After the high-speed shot peening treatment, obvious grain refinement was observed and a nanocrystalline surface layer was found. The grain size increased along with the distance far from nanocrystalline surface. The nanocrystallization mechanism was analyzed in terms of the deformation behavior and TEM observations of the microstructural evolution of the treated samples